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310-813 exam Dumps Source : Sun Certified MySQL 5.0 Developer Part(R) II

Test Code : 310-813
Test cognomen : Sun Certified MySQL 5.0 Developer Part(R) II
Vendor cognomen : SUN
: 70 actual Questions

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SUN SUN Sun Certified MySQL

solar Plans Open source buying Spree, Completes MySQL Deal | killexams.com actual Questions and Pass4sure dumps

news

sun Plans Open supply buying Spree, Completes MySQL Deal solar Microsystems nowadays talked about it has completed its $1 billion acquisition of open supply database supplier MySQL and may circulate aggressively to purchase other open supply carriers.

whereas no selected aims were stated, sun President and CEO Jonathan Schwartz stated the MySQL acquisition may live a key portion in solar's exertion to transform itself into a key provider of open source utility.

"Open source is definitely within the DNA of sun," Schwartz said. "As such, once they appear to live across the market, these corporations that Have constructed good, high-integrity communities and Have large distribution and a few measure of commercial success are the ones we're going to live most attracted to."

just ultimate week, sun introduced the completion of an extra open supply vendor, Innotek, whose VirtualBox desktop virtualization platform works cross-customer operating techniques.

"there may live a transforming into number of totally nosy and totally resourceful open supply organizations available and they trust they are a herbal domestic for lots of them and we're actually going to live placing their stability sheet to drudgery to head figure that the case," Schwartz referred to.

regardless of sun's moves to site itself as a key open source issuer by way of OpenSolaris, Java, NetBeans and its GlassFish software server residences, industry officials stated gaining MySQL will let solar tap into MySQL's stated 11 million subscribers whereas giving credence to MySQL as an option database platform to industry shoppers.

"MySQL is among the most advantageous manufacturers in the free and open source choice world," mentioned wealthy green, government vp of solar's application company. "This combination strengthens solar's position because the greatest contributor to the open supply neighborhood and offers solar a dramatically more desirable attain."

sun first introduced its intent to acquire MySQL in mid-January and spoke of both organizations moved directly to immediate the deal. MySQL CEO Marten Mickos will reside on with solar as senior vice chairman of the enterprise's current database neighborhood.

solar too moved without retard to transition the MySQL product line. The industry talked about clients can download the database freed from freight right here. commercial enterprise consumers can now subscribe to MySQL's complete product line. sun referred to it's offering ordeal subscriptions freed from can charge.

The company additionally launched MySQL enterprise unlimited , a subscription-based provider for the deployment and management of any variety of MySQL industry Servers.

concerning the writer

Jeffrey Schwartz is editor of Redmond journal and too covers cloud computing for Virtualization overview's Cloud report. moreover, he writes the Channeling the Cloud column for Redmond Channel partner. follow him on Twitter @JeffreySchwartz.


sun Basket offers Meal Kits in keeping with American melanoma Society instructions | killexams.com actual Questions and Pass4sure dumps

published: Mon, November 5, 2018 1:27 PM

solar Basket has launched meal kits that meet the American cancer Society's dietary guidelines. The company says the ACS recommends a eating regimen lofty in greens, fruits, entire grains, and lank proteins however low in purple and processed meat. sun Basket is offering plant-forward vegan, vegetarian, and pescatarian plans for those seeking to consume by way of these requisites.

govt Chef Justine Kelly, the former head chef on the Slanted Door, a James Beard Award-winning restaurant, created the plans, which proffer nutritionally balanced nutrition with globally impressed flavors. And the products are made with organic produce and immaculate materials.

The enterprise notes that here's one of a yoke of health-oriented improvements. different initiatives consist of partnering with the American Diabetes affiliation on a diabetes-pleasant meal map and offering coronary heart-determine licensed recipes that meet American coronary heart association requisites. 

linked: sun Basket Opens Distribution headquarters in a Missouri Cave; sun Basket Opens current Distribution center.

NewsOK has disabled the comments for this article.


Renesas Electronics Sub-Gigahertz instant solution selected as standard perceive at various bed Unit for Wi-solar FAN | killexams.com actual Questions and Pass4sure dumps

with the aid of Ken Briodagh November 07, 2018

based on a synchronous announcement, Wi-sun Alliance has adopted the Renesas Electronics supplier, a employer of superior semiconductor options, sub-gigahertz (Sub-G) instant reply as a candidate of the interoperability verify mattress units (TBUs) for the Wi-sun FAN (container locality network) Certification program.

Renesas is a component of the primary wave of groups taking portion in the Wi-solar FAN 1.0 certification manner with its RAA604S00/RX651 instant solution. Certifications are deliberate by means of the tarry of 2018.

The Sub-G instant solution points Tessera technology’s contrast platform, which contains an assessment board3 hooked up with Renesas’ RAA604S00 instant communications device-on-chip (SoC) and RX651 microcontroller (MCU), in addition to communication control software offered through Renesas. Renesas will panoply the current Sub-G instant reply at its booth (stand B.c44) at European Utility Week 2018, November 6 to November eight, in Vienna, Austria.

“The Wi-sun neighborhood has been making large strides within the building and deployment of instant communications in the energy administration programs trade, and they are pleased to expand their commitment to the wise energy markets and boost the newest Wi-solar requirements with their Wi-sun FAN-licensed reply and test mattress units,” mentioned Akihiro Kuroda, VP, power Infrastructure enterprise Division, Renesas Electronics company.

The Sub-G troupe offers elements which are resilient to physical limitations and might transmit facts even further than supported by using past specifications, even in city environments. considering broad areas may too live covered with respectable steadiness via mesh networks, it is acceptable for applications such sensible meter conversation, energy utilization visualization, monitoring device utilization, and managing quite a lot of sensors inside a utility, factories and structures.

The IoT Evolution Expo, and collocated hobbies, IoT Evolution fitness, LPWAN Expo, The wise metropolis event, and IIoT convention, will engage location Jan. 29 to Feb 1 in ft. Lauderdale, Florida. talk over with IoTEvolutionExpo.com to register now.

Edited via Ken Briodagh

author data

Editorial Director




Killexams.com 310-813 Dumps and actual Questions

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310-813 exam Dumps Source : Sun Certified MySQL 5.0 Developer Part(R) II

Test Code : 310-813
Test cognomen : Sun Certified MySQL 5.0 Developer Part(R) II
Vendor cognomen : SUN
: 70 actual Questions

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Exploring Enums: The Wait Is Finally Over | killexams.com actual questions and Pass4sure dumps

To enumerate means to itemize or to list. In the world of programming, enumerations, enums for short, are used to delineate a finite set of values (constants) that a variable can attain. In other words, it defines the domain of a type. For instance, different states of a fan switch - off, low, medium, and lofty - figure up an enumeration.

Since the first release of Java, programmers Have been complaining about the lack of core language support for enumerated types. After all, Java improvised on the shortcomings of C++ and touted character safety, so it was only natural for the developer community to await support for a upright enum-type. During what seemed affection an eternally long wait, many ad-hoc enum representations evolved and most of them shared a common premise - modeling enumerations based on a primitive type, usually an int; notice Listing 1 for an example.

Although practical, such implementations Have long been frowned upon by Java purists as a hack that can best live described as brittle. What exactly is wrong with such an implementation? In essence, the main disadvantage of faking enumerated types using primitives is the lack of tough typing and hence the inability to entrap errors at compile time. Other shortcomings are less readable code, deviations from object-oriented concepts such as encapsulation, the absence of a namespace requiring an explicit prefix for total references, and the dangers of exposing the internal implementation to client code.

Let's perceive at some of these drawbacks in more detail.

Loose character checking is the result of a compiler treating the faked enumeration just affection any other primitive variable. Since the compiler doesn't know anything about the cohesiveness of the enumeration of constant values, it doesn't catch, for instance, a definitive assignment of an out of purview value. In other words, lack of an explicit character totally gives away the benefits of compile-time error detection.

Such ad hoc approaches violate some of the basic object-oriented principles. In the previous example, the states of the switch lack encapsulation. Attributes representing the constants and operations are not grouped together but are scattered within the enclosing scope. Since the client code is well alert of implementation details, even a wee change such as renumbering them might result in broken client code. too note the lack of explicit scoping. Since enum attributes are listed along with other class attributes, the enclosing scope is often that of the declaring class or interface. This makes their grouping vague, unreadable, and sometimes error prone.

In his bespeak efficient Java, Joshua Bloch presents a pattern for type-safe enums that offers both compile-time safety and better encapsulation. java.awt.Color uses a similar strategy to cloak the int-enum implementation under the sheet. However, after reading through pages complete of Java code, you originate to wonder if the juice is worth the squeeze. It only reinforces the exigency for core language support for enum types. For a language that touts character safety, the design of faking enums with such elaborate pyrotechnics seems rather odd.

Enter the current EnumThe wait is finally over and upright enums are here. Enums are a character of their own in J2SE 5.0. Among many other developer-friendly features recommended in JSR 176, Tiger (the code cognomen for the current release) packs the powerful punch of type-safe enums. Listing 2 shows how they rewrite Fan.java using upright enums. (Listings 2-9 can live downloaded from www.sys-con.com/java/sourcec.cfm.)

Note the current enum keyword introduced to support the current character and too how enumerated constants are listed - they are neither strings nor ints but belong to their own declared type, i.e., SwitchState. Because it's a upright type, total the benefits of tough typing automatically kick in. For instance, the following code attempting to set an invalid state

new Fan().setState(6);

is automatically detected at compile time and reported an error, eliminating the exigency for several lines of validation code:

setState(Fan.SwitchState) in Fan cannot live applied to (int)

Let's perceive at other useful features provided by the enum type.

Support for NamespaceIn the previous example, total the listed constants, e.g., states of the fan switch, implicitly belong to the enclosing type, appropriately named SwitchState, requiring an explicit namespace qualification to total references to states. For example:

SwitchState.Low

Namespace adornment too helps avoid collisions. If they were to declare another enum character for class Fan using a similar set of constants, say:

public enum DurabilityRating { Low, Medium, lofty }

it will result in no cognomen collision. SwitchState.Low can live distinguished from DurabilityRating.Low because of their enclosing scope.

Since enum SwitchState is declared as public, and with the character system providing a namespace for each enum constant, it can live accessed outside the scope of class Fan just affection any regular assign reference, e.g., Fan.SwitchState.Medium.

Auto Conversion to String ValuesThe current enum character easily facilitates descriptive printing using an internal implementation of the toString() method. The default implementation returns a string representation of the constant as declared, and, if you don't affection it, it can live changed by overriding toString(). It's that simple.

Works with Programming ConstructsSince enums are their own types, some of the standard Java constructs, notably the switch and for statements, Have been enhanced to drudgery with enum types. Listing 3 provides an example of the switch construct.

Switch statements are useful for simulating the addition of a manner to an enum character from outside the type. This can live very useful if for some intuition the enum definition cannot live modified, but needs to live extended.

There is something rather nosy about this switch statement - note how the enum constants in case statements issue bare, e.g., unqualified with their namespace. J2SE 5.0 makes life easier by attempting to resolve identifiers in the immediate context. This is rather similar to the current static imports feature. In this example, however, you are required to omit the namespace. Try including it and you'll entrap an error message:

Fan.java:16: an enum switch case label must live the unqualified cognomen of an enumeration constant case SwitchState.Off : recrudesce SwitchState.Low ;

Listing 4 provides an example that uses a for-loop construct to iterate through enums.

The values() manner returns an array that contains enum constants for this enum in the order in which they are declared. By the way, the for-loop shown here is called "enhanced for-loop", another tidy feature in the current release. They are too called as "for-in loop" since you read them as "for-state-in-Switchstate.values". This current construct simplifies iterating over a collection of values - both arrays and Java collections - by taking away the exigency to inspect the size, expend a temporary index variable, and cast each component to the commandeer type.

Looking Under the HoodIn the spirit of empiricism, let's perceive under the hood and notice how enums are implemented. Compiling Fan.java (for the complete source code notice the resources section) generates two .classes: Fan.class and Fan$SwitchState.class. The latter contains their enum definition.

D:\MyJava\JDJ\src>javap Fan$SwitchState Compiled from "Fan.java" public final class Fan$SwitchState extends java.lang.Enum{ public static final Fan$SwitchState Off; public static final Fan$SwitchState Low; public static final Fan$SwitchState Medium; public static final Fan$SwitchState High; public static final Fan$SwitchState[] values(); public static Fan$SwitchState valueOf(java.lang.String); static {}; }

As you can see, the process of compilation results in the automatic generation of a current class that extends java.lang.Enum. In other words, the enum keyword acts as a shorthand representation for the autogenerated class. This is what the authors of JSR 201 meant by "linguistic support for type-safe enumeration pattern." It's worth mentioning that every current language extension introduced in Java 5.0 is implemented by modifying the source-to-byte code compiler so the JVM implementation remains unchanged.

If you notice the naming convention adopted for generated enum types, you'll recognize that they closely resemble the inner class syntax, e.g., <enclosingType>$<thisType> format. total enum classes are final subclasses of java.lang.Enum, serializable, and comparable. They further with predefined toString, hashCode, and equals methods. total methods except toString are final.

Note that total enlisted enum constants are represented as final self-type variables of the class. This is done to ensure no instances exist other than those in the generated class. In other words, enums are Singletons and, for the very reason, they can't live instantiated using current or cloned. The clone manner in java.lang.Enum throws a CloneNotSupportedException.

Since enums are compiled into their own class files, their definition can live changed, e.g., enum constants can live added, deleted, and reordered without having to recompile the clients. If you removed an enum constant that a client is using, you'll fail snappily with an error message.

Now let's perceive at some advanced features.

Flavors of DeclarationEnums can live declared in various flavors. The enum FanState above is an example of an inline declaration. These are useful for defining enums that Have a limited scope - the expend and sling character of enums. Since Java 5.0 introduces the keyword enum at the very flush as class and interface keywords, enums can live declared just as you would a current class or an interface - in its own .java file (see Listing 5).

Normal rules of access visibility that apply to standalone Java classes too apply to enums, whether they are declared inline or in a divide file. For example, if you omitted the public keyword, the enum character will Have the default package visibility and hence live accessible only within the package. Similarly if the SwitchState enum were to Have a private access specifier, it wouldn't live accessible outside the class scope of Fan. You entrap the point.

As with other current features introduced in Java 5.0 such as generics, enums Have been used in several JDK packages. JDK 5.0 includes several enum types to support core classes. For instance, the newly introduced java.lang.Thread class uses an enum named situation to delineate the current situation of the thread. Some of the best enum candidates haven't been converted over yet - affection the most quoted Color class. You can expend Javadoc as your domain lead for spotting enums in Tigerland. The current API Javadoc conveniently lists total enums in the package-summary.html along with other top-level types. Once you Have spotted them, scurry ahead and open the source code and notice how the preachers practice. It's always fun.

Class-like BehaviorSince enums are class-like critters, they support most, if not total (see the Caveat Emptor sidebar), semantics supported by regular Java classes. The enum character definition can Have one or more parameterized constructors, implement interfaces, and support class carcass elements such as attributes, methods, instance and static initializer blocks, and even inner classes.

In addition, arbitrary fields and methods can live added to individual enum constants. Such constant-specific class bodies define anonymous classes inside enum classes that extend the enclosing enum class. Listings 6-9 illustrate the expend of some of these features.

There's a lot to digest here, so let's tackle them one at a time.

We are defining three types of accounts as enums - checking, savings, and investment. First things first - they exigency some clarification of terminology here. Every enum constant has a declaring class, which is too called its type. The term "enum type" is used to mention to the declaring class, e.g., AccountType. When they expend the term "enum constant", it's referring to total enlisted contents contained in the scope of AccountType, e.g., Checking, Savings, and Investment. It shouldn't live very confusing. Just judge of any class declaration and its objects - the enum character is analogous to the class declaration and enum constants, the objects.

Enums Are ClassesSimilarities between a regular class declaration and an enum declaration are hard to miss. The enum character AccountType implements the IAccountType interface and has two constructors. What does it mean? To implement an interface, the enum character must implement every manner defined in the interface. Since total enum constants are objects of the declared type, they partake the common implementation of methods getAvgBalanceMethod and getInterest- Rate. An enum constant declaration, when followed by arguments, invokes the constructor defined by the enum type. In their example, the enum constant Savings invokes the constructor

AccountType(double interestRate)

with argument 3.5.

All the standard rules of constructor overloading and selection specified by the Java Language Specification are followed here. Since enum constant Checking has no arguments following its declaration, it's necessary to provide a no-arg default constructor. If the enum class has no constructor declarations, a parameterless default constructor is automatically provided to match the implicit empty argument list.

Notice how an enum character can declare methods and attributes, again, just affection a regular Java class. For member character declaration, total rules of scoping, access specifiers, and visibility are sound and therefore must live followed with esteem to instance variables and methods. There is something rather nosy with the character AvgBalanceMethod. It's an enum within an enum. Since an enum character can support total types of class members, they can support enums too. Since AvgBalanceMethod is declared as public, it's visible outside the scope of the enclosing AccountType. Notice how it's accessed in the Account class.

Constant Class BodiesEnum constants can live associated with an arbitrary class carcass often referred to as a constant class body. Such classes are very similar to anonymous class declarations (even named similarly) and are implicitly static. This means they can access only static defined in the enclosing scope. Since constant classes are implicit extensions of the enclosing class, they can override methods defined in the enum type. In their example, enum constant Investment overrides getAvgBalanceMethod defined by AccountType. In fact, it would live perfectly legal to declare AccountType as abstract and force every enlisted enum constant to implement methods in the interface in their constant class body. A word of caution: although support for constant class bodies is a very powerful feature, it may live wise to avoid stretching them because of the very reasons why excessive expend of anonymous classes is discouraged - they are less readable and hard to debug.

It's famous to mention here that only a nonfinal instance manner in java.lang.Enum is the toString() method. You can override and implement the per-constant toString() manner to recrudesce a descriptive cognomen for each enum constant. The default implementation of toString() returns just the string equivalent of the constant. Therefore, as illustrated in the example, it may live a obliging design to override when a more descriptive literal is necessary.

Before they proclaim victory, two current classes introduced for enum support deserve consideration: java.util.EnumMap and java.util.EnumSet. As their names suggest, they are enum-enabled counterparts of the standard Java collection implementation. They both require that each component maintained by the collection belong to one enum type. In short, they won't let you mingle and match enum constants from different types. It's rather nosy that they both retain the elements, e.g., the enum constants, in their declared order, totally ignoring any custom implementation of the compareTo() method. live confident to check out their API documentation.

ConclusionThe current enums are a robust way to implement constant named lists and figure them a compelling alternative to ad hoc enum implementations. With class-like deportment and the aptitude to support arbitrary class members, they are certainly bigger than they appear. Although you may not Have an immediate exigency to expend them in your projects, or at least not every feature they offer, keep them in your toolbox and you'll soon find them handy.

Resources

  • Java 5.0 Release candidate home page: http://java.sun.com/j2se/1.5.0/index.jsp
  • JSR 201 - check out the enum draft spec: http://jcp.org/en/jsr/detail?id=201
  • JSR 176 - J2SE 5.0 Release contents: http://jcp.org/en/jsr/detail?id=176

    SIDEBAR

    CAVEAT EMPTORLet the buyer beware: a simple axiom often used in commerce summarizes it well - it means the buyer lonely is liable for assessing the property of a purchase before buying. Enums are so powerful, once you learn the ropes it's smooth to live tempted to stretch and effect "cool" things. Before you know it, rotten things start happening.

    Always check out the API spec and know the expected deportment before you set something to use. As a smart programmer, you too exigency to know the limitations of the enums so that it can deliver your bacon some day.

    1.  You can't current enums: recall they are singletons. For the JVM to handle them properly, only one instance of each should exist. They are automatically created for you. Luckily the compiler catches explicit instantiation. For the very reason, enum constructors are implicitly private. judge about it.

    2.  You can't extend enums: One enum cannot extend another one. You can't extend the primordial java.lang.Enum either. That's how it works and if you are worried about this limitation, your design demands a second look. You shouldn't exigency a hierarchy of enums.

    3.  You can't declare enums locally: Enum types cannot exist in any scope lower than a class scope. You can't define them within a method.

    4.  Order matters: Within the enum character class body, the constants must issue before other class elements such as attributes, methods, and constructors. This is upright at least as of the 5.0 beta release.

    5.  No nulls please: An enum constant cannot live null. It's that simple.

    6.  Don't expend ordinal: Code that uses an ordinal() method, e.g., logic based on the position of an enum constant as it appears in the declaration, must live discouraged. Your code will demolish at runtime if constants are subsequently reordered. What's more, this is a runtime error. The compiler will not entrap such a thing.

    7.  Everything that sounds the same, isn't: There are a few other classes in JDK 5.0 that sound very similar - Enumeration, EnumControl, to cognomen a few. Don't assume they are enum implementations. Check the Javadoc.

    8.  Spare the serialization: Enum serialization isn't affection the regular one you Have seen. The process by which enum constants are serialized cannot live customized. Any class-specific writeObject and writeReplace methods defined by enum types are ignored during serialization. Similarly, any serialPersistentFields or serialVersionUID domain declarations are too ignored - total enum types Have a fixed serialVersionUID of 0L. Again, this shouldn't concern you too much. Let the language engage custody of the specifics.


  • Use the Ruby on Rails Alternative | killexams.com actual questions and Pass4sure dumps

    In-Depth

    Use the Ruby on Rails Alternative

    Take a more expedient approach for developing MVC Web applications than you might engage using J2EE technologies.

  • By Deepak Vohra
  • 03/07/2007
  • Ruby on Rails is an open source Web framework for developing Model-View-Controller (MVC) Web applications that access databases. Ruby on Rails is based on the object-oriented Ruby scripting language. The model class in a Ruby on Rails application specifies the data model. A connection with the database is obtained in the model class, and the database table from which data is to live retrieved is specified. The controller class specifies the actions (methods) that accommodate the industry logic to process data, and the view templates are the user interfaces (UIs) for the MVC application. Controller class methods are invoked from a view template, the controller class processes data using the model class, and it renders a view template or invokes another controller method.

    Ruby on Rails doesn't require configuration files as does a Java 2 Platform, Enterprise Edition (J2EE) application. Ruby on Rails requires a Web server and a database, and it includes the WEBrick Web server. It is too preconfigured with the MySQL database. Let's perceive at how to expend Ruby on Rails to develop a Create-Read-Update-Delete (CRUD) application. A CRUD application is used essentially to create, manipulate, and delete database table entries.

    Because a Rails application is of the MVC pattern, the model and controller classes are Ruby classes (.rb files). The model class models data and extends the ActionRecord::Base class. Models provide object-relational mapping (ORM) between industry objects and the database. The view templates are the UIs of a Ruby on Rails application and are represented with .rhtml or .rxml files. An RHTML view template is the more commonly used alternative and is Ruby-embedded HTML. The controller class extends the ActionController::Base class and specifies actions (methods) to process data. Ruby on Rails provides various commands to generate a Rails application and model and controller classes. Some Ruby on Rails commands are listed in Table 1.

    Get On TrackBegin by installing Ruby on Rails and including RubyGems, the standard package manager used with Ruby applications and libraries. Here is the procedure to install Ruby on Rails:

  • Download the Ruby Windows Installer application by double-clicking the ruby185-21.exe application to start the Ruby Setup Wizard. Click Next, and read and accept the license agreement.
  • Select the default components to install, which include the RubyGems package manager, and click Next.
  • Specify a directory to install Ruby (the default is c:/ruby), and click Next.
  • Choose a Start Menu folder, and click Install to install Ruby and RubyGems.
  • Install Rails by using the CD (change directory) command to figure c:/ruby the current directory, and then Run this command to install Rails and its dependencies—note that the activerecord package implements the model layer of a Rails MVC application, and the actionpack package implements the view and controller: gem install rails --include- dependencies
  • Use Setup.exe to download and install MySQL 5.0, and create a MySQL Server instance.
  • Now let's create a Ruby on Rails application that represents a journal catalog. expend the rails command on the command line to create a Ruby on Rails application in the catalog directory from within the ruby directory:

    rails catalog

    The app directory contains the subdirectories controllers, models, and view for the controller classes, model classes, and view templates, respectively. The config directory contains the database.yml file in which the database configuration is specified. A Rails application may live Run in development (the default mode), test, or production mode.

    For the example here let's Run the Rails application in development mode. Modify the development mode settings in the database.yml file to specify the database as mysql. The development mode settings for the MySQL database should perceive affection this:

    development: adapter: mysql database: test username: root password: mysql host: localhost

    The db directory is used for migration scripts, which will live discussed shortly.

    Now they exigency to create a database table that will expend ActiveRecord migrations. A migration class extends the ActiveRecord::Migration class and is Run with the rake command. The rake command is similar to Ant's build implement for creating J2EE applications. A migration script gets created when a model class script is created. Create a model script with this command in the Ruby Console Window from the ruby/catalog directory:

    ruby script/generate model catalog

    The model class catalog.rb is created in the app/models directory, and the migration script 001_create_catalogs.rb is created in the db/migrate directory. The migration script class, CreateCatalogs, extends the ActiveRecord::Migration class:

    class CreateCatalogs < ActiveRecord::Migration def self.up create_table :catalogs effect |t| # t.column :name, :string end end def self.down drop_table :catalogs end end

    The default migration script consists of the methods self.up and self.down. The self.up manner is invoked to Run a migration and create a database table. expend the create_table transformation of the ActiveRecord::Migration class to create a database table called catalogs. ActiveRecord uses pluralization to map a model class to a database table. The model class is singular and uppercase, and the database table is plural and lowercase.

    In the Ruby on Rails application example the model class is Catalog and the database table is catalogs. The ActiveRecord::Migration class provides various transformations for a database. Some of the transformations are listed in Table 2.

    Modify the migration script 001_create_catalogs.rb to create a database table, and then add data to the table. In the create_table transformation create a table called catalogs with the columns journal, publisher, edition, title, and author:

    create_table :catalogs effect |t| t.column :journal, :string, :limit => 255 t.column :publisher, :string, :limit => 255 t.column :edition, :string, :limit => 255 t.column :title, :string, :limit => 255 t.column :author, :string, :limit => 255 end

    Valid column types are integer, float, datetime, date, timestamp, time, text, string binary, and boolean. sound column options are limit, default, and null.

    Next, add data to the table with the ActiveRecord::Base class method, create, to add a table row:

    Catalog.create :journal => "developerWorks", :publisher => "IBM", :edition => "September 2006", :title=> "A PHP V5 migration guide", :author=>"Jack D. Herrington"

    Listing 1 shows the complete migration script. Run the migration with the rake command from the /ruby/catalog directory. Rails has a target called migrate to Run migrations:

    rake db:migrate

    The catalogs database table is created in the MySQL database named mysql. The catalogs table has a primary key domain of character int(11) and the auto_increment attribute, which generates a unique identity for current rows.

    Develop a CRUD ApplicationBefore they develop a Ruby on Rails CRUD application, note that a Ruby on Rails application consists of these Ruby scripts and view templates:

  • Model class in the app/models directory
  • Controller class in the app/controllers directory
  • View templates (RHTML files) in the app/views directory
  • Previously they created a model class Ruby script. They expend an interface to create current entries in the database, retrieve entries, update entries, and delete entries. The interface to the data in the database is scaffolding. Scaffolding consists of controller and model Ruby classes and view templates. Rails provides two types of scaffolding, dynamic scaffolding and scaffolding created with the ScaffoldGenerator. You can create a dynamic scaffolding by adding this scaffold manner invocation to the controller class:

    scaffold :modelname

    The scaffold manner generates controller logic and view templates dynamically using a model class obtained with Rails naming conventions. The first epistle of the modelname is uppercase to obtain the model class. For example, if the modelname specified in the scaffold manner is catalog, the Catalog model class is used in the scaffolding.

    Instance variables @catalog/@catalogs are used in the controller class; controller instance variables are too available in the view templates. The Rails framework provides the scaffold generator to create a controller class, a model class, and the scaffolding for a CRUD application. Scaffolding generated with the ScaffoldGenerator is similar to the one generated with the scaffold method, except that the controller logic and view templates are generated when the ScaffoldGenerator command is Run instead of being generated dynamically. In the Ruby console window Run the scaffold generator:

    ruby script/generate scaffold catalog

    This command generates a model class, a controller class, and the view templates index.rhtml, list.rhtml, show.rhtml, new.rhtml, create.rhtml, edit.rhtml, update.rhtml, and destroy.rhtml. The Catalog model class looks affection this:

    class Catalog > ActiveRecord::Base end

    Listing 2 shows the controller class CatalogsController.

    With the scaffolding these actions (methods) are generated in the controller class: index, list, show, new, create, edit, update, and destroy. The default view templates may live overridden with view templates in the views directory. For example, a custom view template edit.rhtml can live provided in the views/catalog directory.

    Next, let's Run the Ruby on Rails application in the WEBrick Web server. originate by starting the WEBrick server from the /ruby/catalog directory:

    ruby script/server

    Access the WEBrick Web server with the URL, http://localhost:3000 (see device 1). panoply the list of catalog entries with the list view template, which is invoked with the URL, http://localhost:3000/catalogs/list. To create a current catalog entry click the current catalog link (see device 2). In the current view template add a catalog entry, and click the Create button. A current catalog entry is added in the list view template. Click the panoply link to panoply a catalog entry. To delete a catalog entry click the Destroy link, and to edit a catalog entry click the Edit link (see device 3).

    Use the edit view template to modify the catalog entry; for example, modify the title and click the Edit button to update the catalog entry (see device 4).

    Ruby on Rails is simpler than J2EE for developing MVC Web applications. The JavaServer Pages (JSP), HTML, servlets, Enterprise JavaBeans (EJB), and configuration fields that are required in a J2EE application are not required for a Ruby on Rails application.

    About the Author

    Deepak Vohra, a Sun-certified Java programmer and Sun-certified Web component developer, has published numerous articles in industry publications and journals. Deepak is the author of the bespeak "Ruby on Rails for PHP and Java Developers."


    Anatomy of a Java Finalizer | killexams.com actual questions and Pass4sure dumps

    A yoke of patterns that could antecedent Java pile exhaustion were identified from years of research at IBM. One nosy scenario was observed when Java applications generated an excessive amount of finalizable objects whose classes had non-trivial Java finalizers.

    What Is a Java Finalizer?A Java finalizer performs finalization tasks for an object. It's the antithetical of a Java constructor, which creates and initializes an instance of a Java class. A Java finalizer can live used to fulfill postmortem cleanup tasks on an instance of a class or to release system resources such as file descriptors or network socket connections when an remonstrate is no longer needed and those resources Have to live released for other objects. You don't exigency any argument or any recrudesce value for a finalizer. Unfortunately the current Java language specification does not define any finalizers for a Java class or interface when a class or interface is unloaded. Let's engage a closer perceive at finalize() manner of java.lang.Object that provides an instance method, finalize() for finalization:

    protected void finalize() throws Throwable

    When a Java remonstrate is no longer needed, the space occupied by the remonstrate is supposed to live recycled automatically by the Java garbage collector. This is one of the significant differences in Java and is not establish in most structural programming languages affection C. If an instance of a class implements the finalize() method, its space cannot live recycled by the garbage collector in a timely fashion. Worst case, it may not live recycled at all.

    Any instances of classes that implement the finalize() manner are often called finalizable objects. They will not live immediately reclaimed by the Java garbage collector when they are no longer referenced. Instead, the Java garbage collector appends the objects to a special queue for the finalization process. Usually it's performed by a special thread called a "Reference Handler" on some Java Virtual Machines. During this finalization process, the "Finalizer" thread will execute each finalize() manner of the objects. Only after successful completion of the finalize() manner will an remonstrate live handed over for Java garbage collection to entrap its space reclaimed by "future" garbage collection. I did not drawl "current," which means at least two garbage collection cycles are required to reclaim the finalizable object. Sounds affection it has some overhead? You got it. They exigency several shots to entrap the space recycled.

    Finalizer threads are not given maximum priorities on systems. If a "Finalizer" thread cannot keep up with the rate at which higher priority threads antecedent finalizable objects to live queued, the finalizer queue will keep growing and antecedent the Java pile to fill up. Eventually the Java pile will entrap exhausted and a java.lang.OutOfMemoryError will live thrown.

    A Java Virtual Machine will never invoke the finalize() manner more than once for any object. If there's any exception thrown by the finalize() method, the finalization of the remonstrate is halted.

    You are free to effect virtually anything in the finalize() manner of your class. When you effect that, gladden effect not await the recollection space occupied by each and every remonstrate to live reclaimed by the Java garbage collector when the remonstrate is no longer referenced or no longer needed. Why? It is not guaranteed that the finalize() manner will complete the execution in timely manner. Worst case, it may not live even invoked even when there are no more references to the object. That means it's not guaranteed that any objects that Have a finalize() manner are garbage collected. That's a potential hazard from a recollection management perspective and, needless to say, there is considerable overhead for queuing, dequeuing, running the finalize() method, and rescanning the remonstrate in the next garbage collection cycle.

    If you want to Run cleanup tasks on objects, consider finalizers as a eventual turn and implement your own cleanup method, which will live more predictable. It's very risky to trust on finalizers for postmortem cleanup tasks, especially if your finalizable objects Have references to indigenous resources.

    Hands-on sustain with Java FinalizerWe can easily simulate this scenario with a yoke of test applications and engage a perceive at dumps and traces to notice what's happening inside of the Java pile and threads for hands-on experience.

    Let's build a yoke of Java classes to recreate typical scenarios.

    In ObjectWYieldFinalizer, they can implement the manner finalize() with Thread.yield() so that finalize() cannot complete its execution (see Listing 1) (Listings 1-7 can live downloaded here.)

    The Thread.yield() manner prevents the currently executing thread from running and allows other threads to execute. If the Finalizer thread calls this finalize() method, it will suspension its execution.

    In ObjectWExceptionFinalizer, the finalizer() manner immediately throws a java.lang.IndexOutOfBoundsException. If the Finalizer thread calls this finalize() method, the remonstrate finalization won't live completed because of the exception and there's no second casual to Run the finalize() manner (see Listing 2).

    In ObjectWEmptyFinalizer, they don't implement any code in the finalize() manner (see Listing 3). ObjectWOFinalizer doesn't Have any finalize() manner (see Listing 4).

    Let's Run each of the classes to notice what happens. Sun's Java Virtual Machine (JVM) can live used with the following options for the class TestObjectWYieldFinalizer.

    /sun1.6.0_10/bin/java -Xmx50m -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+HeapDumpOnOutOfMemoryError TestObjectWYieldFinalizer > verbosegc.txt

    It looks very complicated. Why effect they exigency those command-line options? Well, without those options, they only entrap a exiguous information about Java garbage collection activities affection this:

    [Full GC 50815K->45644K(50816K), 0.2276940 secs][Full GC 48780K->46415K(50816K), 0.2233279 secs][Full GC 49551K->49551K(50816K), 0.2396315 secs][Full GC 50815K->50815K(50816K), 0.1886312 secs][Full GC 50815K->49219K(50816K), 0.1964926 secs][Full GC 50815K->50815K(50816K), 0.1865343 secs][Full GC 50815K->50815K(50816K), 0.1836961 secs]

    We only entrap a character of garbage collection (Full GC), total Java pile usage before garbage collection (50,815K), total Java pile usage after garbage collection (45,644K), a lofty watermark of total Java pile (50,816K), and time spent in the garbage collection (0.2276940 secs).

    High watermark is the size of the current Java heap. The Java pile can expand its size up to a maximum size or contract to manage Java pile effectively.

    The -XX:+PrintGCDetails option lets the JVM provide information on each generation in the Java heap.

    We can notice Java pile usage and the time (in seconds) spent in Java garbage collection of each current generation, tenured generation, and permanent generation with the -XX:+PrintGCDetails option in the following example:

    [GC [DefNew: 3520K->3520K(3520K), 0.0001143 secs][Tenured: 43897K->47295K(47296K), 0.2110999 secs] 47417K->47415K(50816K), [Perm : 17K->17K(12288K)], 0.2115593 secs][Times: user=0.22 sys=0.00, real=0.22 secs]

    In tenured generation, Java pile usage was 43,897KB before this Java garbage collection. Java pile usage reached 47,295KB after Java garbage collection; 47296K is the size of the lofty watermark of the tenured generation; 0.2110999 second was spent to collect the tenured generation. Unfortunately they effect not notice the maximum size of each generation with the -XX:+PrintGCDetails option alone.

    With -XX:+PrintGCTimeStamps, they can entrap a timestamp for each garbage collection affection this:

    1.393: [GC 1002K->106K(5056K), 0.0001036 secs]

    This garbage collection started 1.393 seconds after the JVM started.

    The -XX:+PrintHeapAtGC option provides extensive information about each Java garbage collection (see Listing 5).

    We can even notice the address purview of each generation. Unfortunately there's no timestamp for each garbage collection with -XX:+PrintHeapAtGC option alone.

    The eventual option, -XX:-HeapDumpOnOutOfMemoryError allows the JVM to dump the Java pile to a file when an allocation from the Java pile cannot live satisfied or a java.lang.OutOfMemoryError is thrown. This option was introduced in Sun Java 1.4.2 update 12 and Sun Java 5.0 update 7.

    If you want to experiment with IBM's Java Virtual Machine, total you exigency is a -verbosegc command-line option. You effect not exigency any of these: -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC, or -XX:+HeapDumpOnOutOfMemoryError.

    Let's engage a perceive at what happened to the class while they talked about Sun JVM's command-line option. We've got java.lang.OutOfMemoryError from TestObjectWYieldFinalizer:

    Exception in the thread "main" java.lang.OutOfMemoryError: Java pile spaceat java.lang.ref.Finalizer.register(Finalizer.java:72)at java.lang.Object.<init>(Object.java:20)at ObjectWYieldFinalizer.<init>(ObjectWYieldFinalizer.java:2)at TestObjectWYieldFinalizer.main(TestObjectWYieldFinalizer.java:11)

    "java.lang.OutOfMemoryError: Java pile space." That means they got Java pile space exhaustion. The JVM could not earmark any more Java pile while running the manner java.lang.ref.Finalizer.register(), which is on line 72 of Finalizer.java. Finalizer.java? Of course, they did not write Finalizer.java. That's a portion of the JVM. They can too check verbosegc.txt to which they redirected the garbage collection trace (see Listing 6).

    About 3.711 seconds after the JVM started, they got java.lang.OutOfMemoryError. The Java pile dump is written to pid124.hprof.

    Analysis of Java Garbage Collection TracesWe can expend a implement to dissect this trace. The IBM Pattern Modeling and Analysis implement for Java Garbage Collector (PMAT) is one of top five technologies at alphaWorks. I Have implemented patented algorithms to forecast future failures related to Java pile exhaustion in this tool. gladden mention to United States Patent No. 7,475,214 if you are interested in the algorithms. Although they don't exigency these algorithms to investigate simple problem affection this, you might live able to find situations where you could entrap some insight from fortune tellers. They can entrap a copy of the implement here.

    PMAT parses verbose garbage collection (GC) trace, analyzes Java pile usage, and recommends practicable solutions based on pattern modeling of Java pile usage.

    The following features are included:

  • GC analysis
  • GC table view
  • Allocation failure summary
  • GC usage summary
  • GC duration summary
  • GC graph view
  • GC pattern analysis
  • Zoom in/out/selection/center of chart view
  • The implement can too parse Sun's Java garbage collector traces, including the following:

  • Serial collector
  • Throughput/parallel collector
  • Concurrent collector
  • Incremental/train collector
  • We can start version 3.2 of the implement with a jar file in the download package. (V3.2 was the latest version when this article was written.)

    # /usr/java5/bin/java -Xmx200m -jar ga32.jar

    The implement provides a headless mode but let's bring up the graphical user interface mode for smooth demonstration. They can click on the "N" icon to open Sun's trace file. They can click on "I" for IBM's trace file as seen in device 1.

    We can notice in device 2 the analysis result and recommendation virtually instantly.



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    Operations & Process Management: Principles & Practice for Strategic ImpactOperations & Process Management: Principles & Practice for Strategic Impact
    By Nigel Slack, Alistair Jones
    Publisher : Pearson (Feb 2018)
    ISBN10 : 129217613X
    ISBN13 : 9781292176130
    Our ISBN10 : 129217613X
    Our ISBN13 : 9781292176130
    Subject : Business & Economics
    Price : $75.00
    Computer Security: Principles and PracticeComputer Security: Principles and Practice
    By William Stallings, Lawrie Brown
    Publisher : Pearson (Aug 2017)
    ISBN10 : 0134794109
    ISBN13 : 9780134794105
    Our ISBN10 : 1292220619
    Our ISBN13 : 9781292220611
    Subject : Computer Science & Technology
    Price : $65.00
    Urban EconomicsUrban Economics
    By Arthur O’Sullivan
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 126046542X
    ISBN13 : 9781260465426
    Our ISBN10 : 1260084493
    Our ISBN13 : 9781260084498
    Subject : Business & Economics
    Price : $39.00
    Urban EconomicsUrban Economics
    By Arthur O’Sullivan
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 0078021782
    ISBN13 : 9780078021787
    Our ISBN10 : 1260084493
    Our ISBN13 : 9781260084498
    Subject : Business & Economics
    Price : $65.00
    Understanding BusinessUnderstanding Business
    By William G Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (Feb 2018)
    ISBN10 : 126021110X
    ISBN13 : 9781260211108
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
    Price : $75.00
    Understanding BusinessUnderstanding Business
    By William Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (May 2018)
    ISBN10 : 1260682137
    ISBN13 : 9781260682137
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
    Price : $80.00
    Understanding BusinessUnderstanding Business
    By William Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 1260277143
    ISBN13 : 9781260277142
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
    Price : $77.00
    Understanding BusinessUnderstanding Business
    By William Nickels, James McHugh, Susan McHugh
    Publisher : McGraw-Hill (Jan 2018)
    ISBN10 : 1259929434
    ISBN13 : 9781259929434
    Our ISBN10 : 126009233X
    Our ISBN13 : 9781260092332
    Subject : Business & Economics
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    Publisher : McGraw-Hill (Jan 2017)
    ISBN10 : 1260128474
    ISBN13 : 9781260128475
    Our ISBN10 : 1259921883
    Our ISBN13 : 9781259921889
    Subject : Business & Economics, Communication & Media
    Price : $39.00
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    By Peter Cardon
    Publisher : McGraw-Hill (Feb 2017)
    ISBN10 : 1260147150
    ISBN13 : 9781260147155
    Our ISBN10 : 1259921883
    Our ISBN13 : 9781259921889
    Subject : Business & Economics, Communication & Media
    Price : $64.00
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