blaze-ds presentation by subrata

8/14/2019 Blaze-ds Presentation by Subrata

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Blaze-DS Exploration Findings


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Introduction-

Blaze DS is a server-based Java remoting and web

messaging technology that allows you to connect to

back-end distributed data and push data in real-time to

Adobe Flex and Adobe AIR rich Internet applications (RIA).

Previously it was a part of Adobe LCDS .After December 2007 it

became Open source under LGPL.
http://en.wikipedia.org/wiki/Java_%28programming_language%29http://en.wikipedia.org/wiki/Adobe_Flexhttp://en.wikipedia.org/wiki/Adobe_AIRhttp://en.wikipedia.org/wiki/RIAhttp://en.wikipedia.org/wiki/RIAhttp://en.wikipedia.org/wiki/Adobe_AIRhttp://en.wikipedia.org/wiki/Adobe_Flexhttp://en.wikipedia.org/wiki/Java_%28programming_language%29


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LCDS Feature:-


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Blaze-DS Feature in Red Box :-


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Blaze-DS is good because it uses AMF ?

What is AMF ??

It stands for Action Message Format.

Fast(10x over XML) and small in size.

Action Message Format (AMF) is a compact binary formatthat is used to serialize ActionScript object graphs. Once

serialized an AMF encoded object graph may be used to

persist and retrieve the public state of an application

across sessions or allow two endpoints to communicate

through the exchange of strongly typed data.

AMF was introduced with Flash Player 6, and this version

is referred to as AMF 0.(Now with AS3.0 AMF 3.0 is used)


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Blaze-DS is good because it uses AMF ?

What is AMF ??

It stands for Action Message Format.

Fast(10x over XML) and small in size.

Action Message Format (AMF) is a compact binary formatthat is used to serialize ActionScript object graphs. Once

serialized an AMF encoded object graph may be used to

persist and retrieve the public state of an application

across sessions or allow two endpoints to communicate

through the exchange of strongly typed data.

AMF was introduced with Flash Player 6, and this version

is referred to as AMF 0.(Now with AS3.0 AMF 3.0 is used)


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Services provided in Blaze-DS

RPC services :---- Provides a call and response model for accessingexternal data.

-- Make asynchronous requests to remote services thatprocess the requests, and then return data to your Flexapplication.

Message Service :---- Provides messaging services for collaborative and real-time applications.

-- Send messages to and receive messages from otherapplications, including Flex applications and JMS.


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Remote procedure call (RPC) component

RPC component arebased on SOA.

HTTP services .

Web services .

Java objects (remote object

services) .


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Steps in Creating RPC Clients-

Declaring an RPC component.

Configuring a destination.

Calling a service Parameter Binding, Explicit parameter

passing).

Calling services in AS (result,fault,name,concurrency).

Handling service results.

Validation.

Handling asynchronous calls to services.

Accessing Java objects in the source path (EJB).

(Small App with Add, view, delete Operation in Flex

With directory structure of various config files)


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Parameter binding Example

{text1.text}

{text2.text}


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Explicit parameter passing Example :-


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Configuring RPC Services:-

Destination configuration .

An RPC service destination is the object or service that

you connect to using an ,

, or tag or the

corresponding ActionScript API.

Configuring destination properties .

To communicate with Remoting Service and ProxyService destinations, you configure specific types of

destination properties in the properties section of a

destination definition.


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Destination configuration Example:-

samples.explorer.EmployeeManager

application


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Configuring destination properties :-

For Remote Object :--

samples.explorer.EmployeeManager

application (request , session)

For Web Service Parameters used :- wsdl , soap .

For HTTP Service Parameters used :- url , dynamic-url .


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Serializing Data (AS to Java) :-

Array (dense) -> java.util.List

Array (sparse) -> java.util.Map

Boolean String of "true" or "false -> java.lang.Boolean

flash.utils.ByteArray -> byte[ ]

flash.utils.IExternalizable -> java.io.Externalizable

Date -> java.util.Date

int/uint -> java.lang.Integer

Null -> null

Number -> java.lang.Double

Object (generic) -> java.util.Map

String -> java.lang.String

XMLDocument -> org.w3c.dom.Document


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Serializing Data ( Java to AS) :-

enum (JDK 1.5) -> String

java.lang.String -> String java.lang.Boolean, boolean -> Boolean

java.lang.Integer, int -> int

java.lang.Short, short -> int

ava.lang.Byte, byte[] -> int

java.lang.Byte[] -> flash.utils.ByteArray

java.lang.Double, double -> Number

java.lang.Character, char -> String

java.util.Calendar -> Date

java.util.Date -> Date

java.util.Collection -> mx.collections.ArrayCollection

java.util.Map -> Object

org.w3c.dom.Document -> XML object


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Blaze-DS uses the standard Java class,java.beans.Introspector, to get property descriptors for a Javabean class. It also uses reflection to gather public fields on aclass.

The Java and ActionScript property names should match. In the ActionScript class, you use the [RemoteClass(alias=" ")]

metadata tag to create an ActionScript object that maps directlyto the Java object.

Example:--

package samples.contact {

[Bindable]

[RemoteClass(alias="samples.contact.Contact")]

public class Contact {public var contactId:int;

}

}


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Configuring Blaze-DS :-

Important Files :--

services-config.xmlThe top-level Blaze-DS configuration file. This file usually containssecurity constraint definitions, channel definitions, and loggingsettings that each of the services can use. It can contain servicedefinitions inline or include them by reference. Generally, the servicesare defined in the remoting-config.xml, proxy-config.xml, and

messaging-config.xml. remoting-config.xml

The Remoting Service configuration file, which defines RemotingService destinations for working with remote objects.

proxy-config.xml

The Proxy Service configuration file, which defines Proxy Service

destinations for working with web services and HTTP services (RESTservices).

messaging-config.xml

The Message Service configuration file, which defines Message Servicedestinations for performing publish subscribe messaging.


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Securing destinations(Custom) :-

Custom

Custom

sampleuser r

tomcatUser.xml should contain the following entry:--


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Passing credentials to a remote service:-

var employeeHTTP:HTTPService = new HTTPService();

employeeHTTP.destination = "secureJSP";employeeHTTP.setRemoteCredentials

("myRemoteUserName", "myRemotePassword");

employeeHTTP.send({param1: 'foo'});

Alternative way of doing the above is

http://someserver/SecureService.jsp

johndoeopensaysme


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Securing destinations(Basic) :-

Basic Basic

privilegedusers

In Web.xml the following need to be set :-

Protected Channel

/messagebroker/amf

GET

POST

sampleusers

BASIC

sampleusers


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Login adapters :-

For both custom and basic authentication, Flex uses alogin adapter, known as a login command, to check auser's credentials and log a principal into the applicationserver. A login command must implement theflex.messaging.security.LoginCommand API.

For basic authentication, an HTTP 401 error causes abrowser challenge .

For custom authentication, the server sends a fault to theclient to indicate that authentication is required.

(services-config.xml)


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Monitoring and managing services :-

We can See all the MBean through the following :-

http://server:port/ds-consoleData services class loading :--

MessageBrokerServlet

MessageBrokerServlet

flex.messaging.MessageBrokerServlet

services.configuration.file

/WEB-INF/flex/services-config.xml

1
http://-/http://-/


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Server-side service logging:-

We can set the logging level to one of the following available levels:

all ,debug ,info ,warn ,error ,none .Example :-

[Blaze-Ds-Test-By-Subrata]false

false

false

false

Endpoint


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The End

PPT By- Subrata Saha

blaze-ds presentation by subrata

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