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Posted to java-dev@axis.apache.org by ch...@apache.org on 2006/03/23 08:38:40 UTC
svn commit: r388085 [6/6] - in /webservices/axis2/trunk/java/xdocs/latest:
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Added: webservices/axis2/trunk/java/xdocs/latest/userguide3.html
URL: http://svn.apache.org/viewcvs/webservices/axis2/trunk/java/xdocs/latest/userguide3.html?rev=388085&view=auto
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--- webservices/axis2/trunk/java/xdocs/latest/userguide3.html (added)
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+ <meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
+ <title>Axis2 User's Guide</title>
+ <meta name="generator" content="amaya 9.3, see http://www.w3.org/Amaya/">
+</head>
+
+<body lang="en-US" dir="ltr">
+<h4><a name="Axis2_User's_Guide">Axis2 User's Guide</a></h4>
+
+<p><i>Version 0.95</i></p>
+<i>User Feedback: <a
+href="mailto:axis-user@ws.apache.org">axis-user@ws.apache.org</a></i>
+
+<p align="right">Pages: <a href="userguide.html">Content</a>, <a
+href="userguide1.html">1</a>, <a href="userguide2.html">2</a>, <b>3</b>, <a
+href="userguide4.html">4</a>, <a href="userguide5.html">5</a></p>
+
+<p><b><font size="4">Note (on samples):</font></b> In this page of the user's
+guide we will look at how to write Web Service Clients using Axis2. All the
+user's guide samples are located at the <b><font
+color="#000000">"samples/userguide/src"</font></b> directory of the binary
+distribution. So... let's explore the samples.</p>
+
+<h2><a name="Web_Service_Clients_Using_Axis2">Web Service Clients Using
+Axis2</a></h2>
+
+<p>Now let's see how we can write a Web Service Client to use this Web
+Service.</p>
+
+<p>Web services can be used to provide wide range of functionality to the
+users ranging from simple, less time consuming operations such as
+"getStockQuote" to time consuming business services. When we utilize (invoke
+using client applications) these Web Service we cannot use some simple
+generic invocation paradigm that suites all the timing complexities involved
+in the service operations. For example, if we use a single transport channel
+(such as HTTP) to invoke a Web Service with and IN-OUT operation that take
+long time to complete, then most of the time we may end up with "connection
+time outs". On the other hand, if there are simultaneous service invocations
+that we need to perform from a single client application, then the use of a
+"blocking" client API will degrade the performance of the client application.
+Similarly there are various other consequences such as One-Way transports
+that come in to play when we need them. Let's try to analyze some common
+service invocation paradigms.</p>
+
+<p>Many web service engines provide the users with a Blocking and
+Non-Blocking client APIs.</p>
+<ul>
+ <li><p style="margin-bottom: 0in"><b>Blocking API</b> -Once the service
+ invocation is called, the client application hangs and only gets control
+ back when the operation completes, after which client receives a response
+ or a fault. This is the simplest way of invoking Web Services and it also
+ suites many business situations.</p>
+ </li>
+ <li><p><b>Non-Blocking API </b>- This is a callback or polling based API,
+ hence once a service invocation is called, the client application
+ immediately gets the control back and the response is retrieved using the
+ callback object provided. This approach provides the flexibility to the
+ client application to invoke several Web Services simultaneously without
+ blocking the operation already invoked.</p>
+ </li>
+</ul>
+
+<p>Both these mechanisms work in the API level. Let's name the asynchronous
+behavior that we can get using the <strong>Non-Blocking API</strong> as
+<b>API Level Asynchrony.</b></p>
+
+<p>Both these mechanisms use single transport connection to send the request
+and to receive the response. They severely lags the capability of using two
+transport connections for the request and the response (either One-Way of
+Two-Way). So both these mechanisms fail to address the problem of long
+running transactions (the transport connection may time-out before the
+operation completes). A possible solution would be to use <strong>two
+separate transport connections for request and response</strong>. The
+asynchronous behavior that we gain using this solution can be called
+<b>Transport Level Asynchrony</b>.</p>
+
+<p>By combining API Level Asynchrony & Transport Level Asynchrony we can
+obtain four different invocation patterns for web services as shown in the
+following table.</p>
+<a name="table1"></a>
+
+<table width="100%" border="1" cellpadding="0" cellspacing="0">
+ <tbody>
+ <tr>
+ <td width="33%" height="19"><p><strong>API
+ (Blocking/Non-Blocking)</strong></p>
+ </td>
+ <td width="33%"><p><strong> Dual Transports (Yes/No)</strong></p>
+ </td>
+ <td width="33%"><p><strong>Description</strong></p>
+ </td>
+ </tr>
+ <tr>
+ <td width="33%" height="19"><p>Blocking</p>
+ </td>
+ <td width="33%"><p>No</p>
+ </td>
+ <td width="33%"><p>Simplest and the familiar invocation pattern</p>
+ </td>
+ </tr>
+ <tr>
+ <td width="33%" height="19"><p>Non-Blocking</p>
+ </td>
+ <td width="33%"><p>No</p>
+ </td>
+ <td width="33%"><p>Using callbacks or polling</p>
+ </td>
+ </tr>
+ <tr>
+ <td width="33%" height="19"><p>Blocking</p>
+ </td>
+ <td width="33%"><p>Yes</p>
+ </td>
+ <td width="33%"><p>This is useful when the service operation is IN-OUT
+ in nature but the transport used is One-Way (e.g. SMTP)</p>
+ </td>
+ </tr>
+ <tr>
+ <td width="33%" height="19"><p>Non-Blocking</p>
+ </td>
+ <td width="33%"><p>Yes</p>
+ </td>
+ <td width="33%"><p>This is can be used to gain the maximum asynchronous
+ behavior. No blocking in the API level and also in the transport
+ level</p>
+ </td>
+ </tr>
+ </tbody>
+</table>
+
+<p>Axis2 provides the user with all these possibilities to invoke Web
+Services.</p>
+
+<p>Below we describe how to write Web Services Clients using Axis2. This can
+be done in two methods:</p>
+<ol>
+ <li><a href="#Writing_Web_Service_Clients_using_Axis2's_Primary_APIs">Using
+ the Axis2's primary APIs</a></li>
+ <li><p><a
+ href="#Writing_Web_Service_Clients_using_Code_Generation_with_Data_Binding_Support">Using
+ stubs generated with data binding support</a>, making the life easy for
+ developers writing Web Service client applications</p>
+ </li>
+</ol>
+
+<h3><a name="Writing_Web_Service_Clients_using_Axis2's_Primary_APIs">Writing
+Web Service Clients Using Axis2's Primary APIs</a></h3>
+
+<h4><a name="EchoBlockingClient">EchoBlockingClient</a></h4>
+
+<p>Axis2 provides the user with several invocation patterns for Web Services,
+ranging from pure blocking single channel invocations to a non-blocking dual
+channel invocations. Let's first see how we can write a client to invoke
+"echo" operation of "MyService" using the simplest blocking invocation. The
+client code you need to write is as follows.</p>
+<source><pre> try {
+ OMElement payload = ClientUtil.getEchoOMElement();
+ <span style="color: #24C113">
+ Options options = new Options();
+ options.setTo(targetEPR);
+ options.setListenerTransportProtocol(Constants.TRANSPORT_HTTP);
+ options.setUseSeparateListener(false);
+
+ ServiceClient serviceClient = new ServiceClient();
+ serviceClient.setOptions(options);
+
+ OMElement result = sender.sendReceive(payload);
+ </span>
+ StringWriter writer = new StringWriter();
+ result.serializeWithCache(new OMOutput(XMLOutputFactory.newInstance().createXMLStreamWriter(writer)));
+ writer.flush();
+
+ System.out.println(writer.toString());
+
+ } catch (AxisFault axisFault) {
+ axisFault.printStackTrace();
+ } catch (XMLStreamException e) {
+ e.printStackTrace();
+ }
+}</pre>
+</source>
+<p>The green lines shows the set of operations that you need to perform
+inorder to invoke a web service. The rest is used to create the OMElement
+that needs to be sent and display the response OMElement. To test this
+client, use the provided ant build file that can be found in the
+"Axis2Home/samples" directory. Run the "testEchoBlockingClient" target . If
+you can see the response OMElement printed in your command line, then you
+have successfully tested the client. </p>
+
+<h4><a name="PingClient">PingClient</a></h4>
+
+<p>In the Web Service "MyService" we had a IN-ONLY operation with the name
+"ping" (see <a href="userguide2.html#Web_Services_Using_Axis2">Web Services
+Using Axis2</a>). Let's write a client to invoke this operation. The client
+code is as follows:</p>
+<pre> try {
+ OMElement payload = ClientUtil.getPingOMElement();
+ Options options = new Options();
+ options.setTo(targetEPR);
+ ServiceClient serviceClient = new ServiceClient();
+ serviceClient.setOptions(options);
+ serviceClient.fireAndForget(payload);
+ /**
+ * We have to bock this thread untill we send the request , the problem
+ * is if we go out of the main thread , then request wont send ,so
+ * you have to wait some time :)
+ */
+ Thread.sleep(500);
+ }
+catch (AxisFault axisFault) {
+ axisFault.printStackTrace();
+ }</pre>
+
+<p>Since we are accessing a IN-ONLY operation we can directly use the
+"fireAndForget()" in ServiceClient to invoke this operation , and that will
+not block the invocation, hence it will return the control immediately back
+to the client. You can test this client by running the target
+"testPingClient" of the ant build file at "Axis2Home/samples".</p>
+
+<p>We have invoked the two operations in our service. Are we done? No! There
+are lot more to explore. Let's see some other ways to invoke the same
+operations...</p>
+
+<h4><a name="EchoNonBlockingClient">EchoNonBlockingClient</a></h4>
+
+<p>In the EchoBlockingClient once the "serviceCleint.sendReceive(payload);"
+is called, the client is blocked till the operation is completed. This
+behavior is not desirable when there are many Web Service invocations to be
+done in a single client application. A solution would be to use a
+Non-Blocking API to invoke web services. Axis2 provides a callback based
+non-blocking API for users.</p>
+
+<p>A sample client for this can be found under
+"Axis2Home/samples/userguide/src/userguide/clients" with the name
+EchoNonBlockingClient. If we consider the changes that user may have to do
+with respect to the "EchoBlockingClient" that we have already seen, it will
+be as follows:</p>
+<pre style="margin-bottom: 0.2in">serviceClient.sendReceiveNonblocking(payload, callback);</pre>
+
+<p>The invocation accepts a callback object as a parameter. Axis2 client API
+provides an abstract Callback with the following methods:</p>
+<pre>public abstract void onComplete(AsyncResult result);
+public abstract void onError(Exception e);
+public boolean isComplete() {}</pre>
+
+<p>The user is expected to implement the "onComplete " and "onError " methods
+of their extended call back class. Axis2 engine calls the onComplete method
+once the Web Service response is received by the Axis2 Client API
+(ServiceClient). This will eliminate the blocking nature of the Web Service
+invocations and provides the user with the flexibility to use Non Blocking
+API for Web Service Clients.</p>
+
+<p>To run the sample client ( EchoNonBlockingClient) you can simply use the
+"testEchoNonBlockingClient" target of the ant file found at the
+"Axis2Home/samples" directory.</p>
+
+<h4><a name="EchoNonBlockingDualClient">EchoNonBlockingDualClient</a></h4>
+
+<p>The solution provided by the Non-Blocking API has one limitation when it
+comes to Web Service invocations which takes long time to complete. The
+limitation is due to the use of single transport connection to invoke the Web
+Service and to retrieve the response. In other words, client API provides a
+non blocking invocation mechanism for the users, but the request and the
+response comes in a single transport (Two-Way transport) connection (like
+HTTP). Long running Web Service invocations or Web Service invocations using
+One-Way transports (like SMTP) cannot be utilized by simply using a non
+blocking invocation. </p>
+
+<p>The trivial solution is to use separate transport connections (either
+One-Way or Two-Way) for the request and response. The next problem that needs
+to be solved is the correlation (correlating the request and the response).
+<a href="http://www.w3.org/Submission/ws-addressing/"
+target="_blank">WS-Addressing</a> provides a neat solution to this using
+<wsa:MessageID> and <wsa:RelatesTo> headers. Axis2 provides
+support for addressing based correlation mechanism and a complying Client
+API to invoke Web Services with two transport connections. (Core of Axis2
+does not depend on WS-Addressing, but contains a set of parameters like in
+addressing that can be populated in any means. WS-Addressing is one of the
+users that may populate them. Even the transports can populate these. Hence
+Axis2 has the flexibility to use different versions of addressing)</p>
+
+<p>Users can select between Blocking or Non-Blocking APIs for the Web Service
+clients with two transport connections. By simply using a boolean flag, the
+same API can be used to invoke web services (IN-OUT operations) using two
+separate transport connections. Let's see how it's done using an example.
+Following code fragment shows how to invoke the same "echo" operation using
+Non-Blocking API with two transport connections<strong>. The ultimate
+asynchrony!!</strong></p>
+<pre> try {
+ OMElement payload = ClientUtil.getEchoOMElement();
+ Options options = new Options();<br> options.setTo(targetEPR);
+
+ //The boolean flag informs the axis2 engine to use two separate transport connection
+ //to retrieve the response.
+<br> options.setUseSeparateListener(true);
+ options.setAction("urn:echo");
+
+ ServiceClient serviceClinet = new ServiceClinet();
+<br> serviceClinet.setOptions(options);</pre>
+<pre>
+ //Callback to handle the response
+ Callback callback = new Callback() {
+ public void onComplete(AsyncResult result) {
+ try {
+ StringWriter writer = new StringWriter();
+ result.serializeWithCache(new OMOutput(XMLOutputFactory.newInstance()
+ .createXMLStreamWriter(writer)));
+ writer.flush();
+
+ System.out.println(writer.toString());
+
+ } catch (XMLStreamException e) {
+ onError(e);
+ }
+ }
+
+ public void onError(Exception e) {
+ e.printStackTrace();
+ }
+ };
+
+ //Non-Blocking Invocation
+ serviceClinet.sendReceiveNonBlocking(payload, callback);
+
+ //Wait till the callback receives the response.
+ while (!callback.isComplete()) {
+ Thread.sleep(1000);
+ }
+ serviceClinet.finalizeInvoke();
+
+ } catch (AxisFault axisFault) {
+ axisFault.printStackTrace();
+ } catch (Exception ex) {
+ ex.printStackTrace();
+ }</pre>
+
+<p><font color="#0000ff"><font color="#000000">The boolean flag (value true)
+in the "<b>options.setUseSeparateListener(...)</b>" method informs the Axis2
+engine to use separate transport connections for request and response.
+Finally "<b>serviceClinet.finalizeInvoke()</b>" informs the Axis2 engine to
+stop the client side listener started to retrieve the
+response.</font></font></p>
+
+<p>Before we run the sample client we have one more step to perform. As
+mentioned earlier Axis2 uses addressing based correlation mechanism, hence we
+need to "engage" addressing module in the server side as well. According to
+the Axis2 architecture, addressing module put its handlers in the
+"<strong>pre-dispatch</strong>" phase (See <a
+href="Axis2ArchitectureGuide.html" target="_blank">Architecture Guide</a> for
+more details about phases) and hence "engaging" means simply adding module
+reference in the "axis2.xml" (NOT the "services.xml"). Now add the following
+line to the "axis2.xml" that you can find in the "/webapps/axis2/WEB-INF"
+directory in the servlet container. </p>
+<pre style="margin-bottom: 0.2in"> <module ref="addressing"/></pre>
+
+<p>Note: <font color="#000000">Once you change the "axis2.xml" you need to
+restart the servlet container.</font></p>
+
+<p>This will enable the addressing in the server side. Now you can test the
+"TestEchoNonBlockingDualClient" using the "testEchoNonBlockingDualClient"
+target of the ant file found at "Axis2Home/samples" directory. If you see the
+response OMElement printed in the client side, then you have successfully
+tested the Non Blocking API with two transport channels at the client
+side.</p>
+
+<h4><a name="EchoBlockingDualClient">EchoBlockingDualClient</a></h4>
+
+<p>This is again a Two-Way transport request/response client, but this time,
+we use a Blocking API in the client code. Sample code for this can be found
+in the "Axis2Home/samples/userguide/src/userguide/clients/" directory and the
+explanation is similar to the <a
+href="#EchoNonBlockingDualClient">EchoNonBlockingDualClient</a>, except that
+here we do not use a callback object to handle response. This is a very
+useful mechanism when the service invocation is IN-OUT in nature and the
+transports are One-Way (e.g. SMTP). For the sample client we use two HTTP
+connections for request and response. User can test this client using the
+"echoBlockingDualClient" target of the ant build file found in the
+"Axis2Home/samples" directory.</p>
+
+<p>See <a href="http-transport.html" target="_blank">Configuring
+Transports</a> for use different transports.</p>
+
+<h3><a
+name="Writing_Web_Service_Clients_using_Code_Generation_with_Data_Binding_Support">Writing
+Web Service Clients using Code Generation with Data Binding Support</a></h3>
+
+<p>Axis2 provides the data binding support for Web Service client as well.
+The user can generate the required stubs from a given WSDL with the other
+supporting classes. Let's generate stubs for the WSDL used earlier to
+generate the skeleton for the "Axis2SampleDocLitPortType". Simply run the
+WSDL2Java tool that can be found in the bin directory of the Axis2
+distribution using the following command:</p>
+<pre style="margin-bottom: 0.2in">WSDL2Java -uri ..\samples\wsdl\Axis2SampleDocLit.wsdl -o ..\samples\src -p org.apache.axis2.userguide</pre>
+
+<p>This will generate the required stub "Axis2SampleDocLitPortTypeStub.java"
+that can be used to invoke the Web Service Axis2SampleDocLitPortType. Let's
+see how we can use this stub to write Web Service clients to utilize the Web
+Service Axis2SampleDocLitPortType (the service that we have already
+deployed).</p>
+
+<h4><a name="Client_for_echoVoid_Operation">Client for echoVoid
+Operation</a></h4>
+
+<p>Following code fragment shows the necessary code for utilizing the
+echoVoid operation of the Axis2SampleDocLitPortType that we have already
+deployed. In this operation, a blank SOAP body element is sent to the Web
+Service and the same SOAP envelope is echoed back.</p>
+<pre> try {
+ //Create the stub by passing the AXIS_HOME and target EPR.
+ //We pass null to the AXIS_HOME and hence the stub will use the current directory as the AXIS_HOME
+ Axis2SampleDocLitPortTypeStub stub = new Axis2SampleDocLitPortTypeStub(null,
+ "http://localhost:8080/axis2/services/Axis2SampleDocLitPortType");
+ stub.echoVoid();
+
+} catch (Exception e) {
+ e.printStackTrace();
+}</pre>
+
+<h4><a name="Client_for_echoString_Operation">Client for echoString
+Operation</a></h4>
+
+<p>Following code fragment shows the necessary code for utilizing the
+echoString operation of the Axis2SampleDocLitPortType that we have already
+deployed. The code is very simple to understand and the explanations are in
+the form of comments.</p>
+<pre>try {
+ //Create the stub by passing the AXIS_HOME and target EPR.
+ //We pass null to the AXIS_HOME and hence the stub will use the current directory as the AXIS_HOME
+ Axis2SampleDocLitPortTypeStub stub= new Axis2SampleDocLitPortTypeStub(null,
+ "http://localhost:8080/axis2/services/Axis2SampleDocLitPortType");
+ //Create the request document to be sent.
+ EchoStringParamDocument reqDoc= EchoStringParamDocument.Factory.newInstance();
+ reqDoc.setEchoStringParam("Axis2 Echo");
+ //invokes the web service.
+ EchoStringReturnDocument resDoc=stub.echoString(reqDoc);
+ System.out.println(resDoc.getEchoStringReturn());
+
+ } catch (Exception e) {
+ e.printStackTrace();
+ }</pre>
+
+<p>Similarly following code fragments show client side code for
+echoStringArray operation and echoStruct operation respectively.</p>
+
+<h4><a name="Client_for_echoStringArray_Operation">Client for echoStringArray
+Operation</a></h4>
+<pre>try {
+ //Create the stub by passing the AXIS_HOME and target EPR.
+ //We pass null to the AXIS_HOME and hence the stub will use the current directory as the AXIS_HOME
+ Axis2SampleDocLitPortTypeStub stub = new Axis2SampleDocLitPortTypeStub(null,
+ "http://localhost:8080/axis2/services/Axis2SampleDocLitPortType");
+
+ //Create the request document to be sent.
+ EchoStringArrayParamDocument reqDoc = EchoStringArrayParamDocument.Factory.newInstance();
+ ArrayOfstringLiteral paramArray = ArrayOfstringLiteral.Factory.newInstance();
+
+ paramArray.addString("Axis2");
+ paramArray.addString("Echo");
+
+ reqDoc.setEchoStringArrayParam(paramArray);
+ EchoStringArrayReturnDocument resDoc = stub.echoStringArray(reqDoc);
+
+ //Get the response params
+ String[] resParams = resDoc.getEchoStringArrayReturn().getStringArray();
+
+ for (int i = 0; i < resParams.length; i++) {
+ System.out.println(resParams[i]);
+ }
+ } catch (Exception e) {
+ e.printStackTrace();
+ }</pre>
+
+<h4><a name="Client_for_echoStruct_Operation">Client for echoStruct
+Operation</a></h4>
+<pre>try {
+ //Create the stub by passing the AXIS_HOME and target EPR.
+ //We pass null to the AXIS_HOME and hence the stub will use the current directory as the AXIS_HOME
+ Axis2SampleDocLitPortTypeStub stub = new Axis2SampleDocLitPortTypeStub(null,
+ "http://localhost:8080/axis2/services/Axis2SampleDocLitPortType");
+ //Create the request Document
+ EchoStructParamDocument reqDoc = EchoStructParamDocument.Factory.newInstance();
+
+ //Create the complex type
+ SOAPStruct reqStruct = SOAPStruct.Factory.newInstance();
+
+ reqStruct.setVarFloat(100.50F);
+ reqStruct.setVarInt(10);
+ reqStruct.setVarString("High");
+
+ reqDoc.setEchoStructParam(reqStruct);
+
+ //Service invocation
+ EchoStructReturnDocument resDoc = stub.echoStruct(reqDoc);
+ SOAPStruct resStruct = resDoc.getEchoStructReturn();
+
+ System.out.println("floot Value :" + resStruct.getVarFloat());
+ System.out.println("int Value :" + resStruct.getVarInt());
+ System.out.println("String Value :" + resStruct.getVarString());
+
+} catch (Exception e) {
+ e.printStackTrace();
+}</pre>
+
+<p align="right"><a href="userguide2.html"><img src="images/arrow_left.gif">
+Previous</a> | <a href="userguide4.html">Next <img
+src="images/arrow_right.gif"></a></p>
+
+<p>Pages: <a href="userguide.html">Content</a>, <a
+href="userguide1.html">1</a>, <a href="userguide2.html">2</a>, <b>3</b>, <a
+href="userguide4.html">4</a>, <a href="userguide5.html">5</a></p>
+</body>
+</html>
Added: webservices/axis2/trunk/java/xdocs/latest/userguide4.html
URL: http://svn.apache.org/viewcvs/webservices/axis2/trunk/java/xdocs/latest/userguide4.html?rev=388085&view=auto
==============================================================================
--- webservices/axis2/trunk/java/xdocs/latest/userguide4.html (added)
+++ webservices/axis2/trunk/java/xdocs/latest/userguide4.html Wed Mar 22 23:38:30 2006
@@ -0,0 +1,325 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+ <meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
+ <title>Axis2 User's Guide</title>
+ <meta name="generator" content="amaya 9.3, see http://www.w3.org/Amaya/">
+</head>
+
+<body lang="en-US" dir="ltr">
+<h4><a name="Axis2_User's_Guide">Axis2 User's Guide</a></h4>
+
+<p><i>Version 0.95</i></p>
+<i>User Feedback: <a
+href="mailto:axis-user@ws.apache.org">axis-user@ws.apache.org</a></i>
+
+<p align="right">Pages: <a href="userguide.html">Content</a>, <a
+href="userguide1.html">1</a>, <a href="userguide2.html">2</a>, <a
+href="userguide3.html">3</a>, <b>4</b>, <a href="userguide5.html">5</a></p>
+
+<p><b><font size="4">Note (on samples):</font></b> All the user's guide
+samples are located in the <b>"samples/userguide/src"</b> directory of the
+binary distribution.</p>
+
+<h2><a name="Modules"></a>Modules</h2>
+
+<p>Axis2 provides an extended support for modules (See <a
+href="Axis2ArchitectureGuide.html" target="_blank">Architecture Guide</a> for
+more details about modules in Axis2). Let's create a custom module and deploy
+it to the MyService which we created earlier. Following steps shows the
+actions that need to be performed to deploy a custom module for a given Web
+Service:</p>
+<ol>
+ <li><p style="margin-bottom: 0in">Create the Module Implementation</p>
+ </li>
+ <li><p style="margin-bottom: 0in">Create the Handlers</p>
+ </li>
+ <li><p style="margin-bottom: 0in">Create the module.xml</p>
+ </li>
+ <li><p style="margin-bottom: 0in">Modify the "axis2.xml" (if you need
+ custom phases)</p>
+ </li>
+ <li><p style="margin-bottom: 0in">Modify the "services.xml" to engage
+ modules at the deployment time.</p>
+ </li>
+ <li><p style="margin-bottom: 0in">Package in a ".mar" (Module Archive)</p>
+ </li>
+ <li><p>Deploy the module in Axis2</p>
+ </li>
+</ol>
+
+<h3><a name="MyService_with_a_Logging_Module">MyService with a Logging
+Module</a></h3>
+
+<p>Let's write a simple logging module for our sample. This module contains
+one handler that just logs the message that is passed through it. Axis2 uses
+."mar" (Module Archive) to deploy modules in Axis2. Following diagram shows
+the file structure inside that needs to be there in the ".mar" archive. Let's
+create all these and see how it works.</p>
+
+<p><img src="images/userguide/ModuleView.jpg" name="Graphic5" align="bottom"
+width="185" height="120" border="0"></p>
+
+<h4><a name="Step1_:_LoggingModule_Class">Step1 : LoggingModule Class</a></h4>
+
+<p>LoggingModule is the implementation class of the Axis2 module. Axis2
+modules should implement the "org.apache.axis2.modules.Module" interface with
+the following methods.</p>
+<pre>public void init(ConfigurationContext configContext, AxisModule module) throws AxisFault;//Initialize the module
+public void shutdown(AxisConfiguration axisSystem) throws AxisFault;//End of module processing
+public void engageNotify(AxisDescription axisDescription) throws AxisFault;</pre>
+
+<p>These methods can be used to control the module initialization and the
+termination. With the input parameter AxisConfiguration user is provided with
+the complete configuration hierarchy. This can be used to fine-tune the
+module behavior using the module writers. For the simple logging service we
+can keep these methods blank in our implementation class.</p>
+
+<h4><a name="Step2_:_LogHandler">Step2 : LogHandler</a></h4>
+
+<p>A module in Axis2 can contain, one or more handlers that perform various
+SOAP header processing at different phases. (See<a
+href="Axis2ArchitectureGuide.html" target="_blank"> Architecture Guide</a>
+for more information about phases). For the logging module we will write a
+handle with the following methods. "public void invoke(MessageContext ctx);"
+is the method that is called by Axis2 engine when the control is passed to
+the handler. "public void revoke(MessageContext ctx);" is called when the
+handlers are revoked by the Axis2 engine.</p>
+<pre>public class LogHandler extends AbstractHandler implements Handler {
+ private Log log = LogFactory.getLog(getClass());
+ private QName name;
+
+ public QName getName() {
+ return name;
+ }
+
+ public void invoke(MessageContext msgContext) throws AxisFault {
+ log.info(msgContext.getEnvelope().toString());
+ }
+
+ public void revoke(MessageContext msgContext) {
+ log.info(msgContext.getEnvelope().toString());
+ }
+
+ public void setName(QName name) {
+ this.name = name;
+ }
+}</pre>
+
+<h4><a name="Step3_:_module_xml">Step3 : module.xml</a></h4>
+
+<p>"module.xml" contains the deployment configurations for a particular
+module. It contains details such as Implementation class of the module (in
+this example it is the "LoggingModule" class and various handlers that will
+run in different phases). "module.xml" for the logging module will be as
+follows:</p>
+<pre><module name="logging" class="userguide.loggingmodule.LoggingModule ">
+ <inflow>
+ <handler name="InFlowLogHandler" class="userguide.loggingmodule.LogHandler">
+ <order phase="loggingPhase" />
+ </handler>
+ </inflow>
+
+ <outflow>
+ <handler name="OutFlowLogHandler" class="userguide.loggingmodule.LogHandler">
+ <order phase="loggingPhase"/>
+ </handler>
+ </outflow>
+
+ <Outfaultflow>
+ <handler name="FaultOutFlowLogHandler" class="userguide.loggingmodule.LogHandler">
+ <order phase="loggingPhase"/>
+ </handler>
+ </Outfaultflow>
+
+ <INfaultflow>
+ <handler name="FaultInFlowLogHandler" class="userguide.loggingmodule.LogHandler">
+ <order phase="loggingPhase"/>
+ </handler>
+ </INfaultflow>
+</module></pre>
+
+<p>As it can be seen there are four phases defined in this "module.xml"</p>
+<ol>
+ <li>inflow - Represents the handler chain that will run when
+ a message is coming in. </li>
+ <li><p style="margin-bottom: 0in">outflow - Represents the
+ handler chain that will run when the message is going out. </p>
+ </li>
+ <li><p style="margin-bottom: 0in">Outfaultflow - Represents the
+ handler chain that will run when there is a fault and the fault is going
+ out </p>
+ </li>
+ <li><p>INfaultflow - Represents the handler chain that will run when
+ there is a fault and the fault is coming in </p>
+ </li>
+</ol>
+
+<p>Following set of tags describe the name of the handler, handler class and
+the phase in which this handler is going to run. "InFlowLogHandler" is the
+name given for the particular instance of this handler. The value of class
+attribute is the actual implementation class for this handler. Since we are
+writing logging handler, we can reuse the same handler in all these phases.
+However this may not be the same for all the modules. "<order
+phase="loggingPhase" />" describes the phase in which this handler
+runs.</p>
+<pre><handler name="InFlowLogHandler" class="userguide.loggingmodule.LogHandler">
+<order phase="loggingPhase" />
+</handler></pre>
+
+<p>To learn more on Phase rules, click on <a
+href="http://www.developer.com/java/web/article.php/3529321"
+target="_blank">here</a></p>
+
+<h4><a name="Step_4:_Modify_the_"axis2_xml"">Step 4: Modify the
+"axis2.xml"</a></h4>
+
+<p>In this handler the phase "loggingPhase" is defined by the module writer.
+It is not a pre-defined handler phase, hence the module writer should
+introduce it to the "axis2.xml" (NOT the services.xml) so that Axis2 engine
+knows where to place the handler in different "flows" ( InFlow, OutFlow,
+etc.). Following xml lines show the respective changes made to the
+"axis2.xml" in order to deploy this logging module in Axis2 engine. This is
+an extract of the phase section of the "axis2.xml".</p>
+<pre><!-- ================================================= -->
+<!-- Phases -->
+<!-- ================================================= -->
+
+<phaseOrder type="inflow">
+ <!-- System pre defined phases -->
+ <phase name="TransportIn"/>
+ <phase name="PreDispatch"/>
+ <phase name="Dispatch" class="org.apache.axis2.engine.DispatchPhase">
+ <handler name="AddressingBasedDispatcher"
+ class="org.apache.axis2.engine.AddressingBasedDispatcher">
+ <order phase="Dispatch"/>
+ </handler>
+
+ <handler name="RequestURIBasedDispatcher"
+ class="org.apache.axis2.engine.RequestURIBasedDispatcher">
+ <order phase="Dispatch"/>
+ </handler>
+
+ <handler name="SOAPActionBasedDispatcher"
+ class="org.apache.axis2.engine.SOAPActionBasedDispatcher">
+ <order phase="Dispatch"/>
+ </handler>
+
+ <handler name="SOAPMessageBodyBasedDispatcher"
+ class="org.apache.axis2.engine.SOAPMessageBodyBasedDispatcher">
+ <order phase="Dispatch"/>
+ </handler>
+ <handler name="InstanceDispatcher"
+ class="org.apache.axis2.engine.InstanceDispatcher">
+ <order phase="PostDispatch"/>
+ </handler>
+ </phase>
+ <!-- System pre defined phases -->
+ <!-- After Postdispatch phase module author or or service author can add any phase he want -->
+ <phase name="OperationInPhase"/>
+ <phase name="<font color="#33cc00">loggingPhase</font>"/>
+ </phaseOrder>
+ <phaseOrder type="outflow">
+ <!-- user can add his own phases to this area -->
+ <phase name="OperationOutPhase"/>
+ <phase name="<font color="#33cc00">loggingPhase</font>"/>
+ <!--system predefined phase-->
+ <!--these phase will run irrespective of the service-->
+ <phase name="PolicyDetermination"/>
+ <phase name="MessageOut"/>
+ </phaseOrder/>
+ <phaseOrder type="INfaultflow">
+ <!-- user can add his own phases to this area -->
+ <phase name="OperationInFaultPhase"/>
+ <phase name="<font color="#33cc00">loggingPhase</font>"/>
+ </phaseOrder>
+ <phaseOrder type="Outfaultflow">
+ <!-- user can add his own phases to this area -->
+ <phase name="OperationOutFaultPhase"/>
+ <phase name="<font color="#33cc00">loggingPhase</font>"/>
+ <phase name="PolicyDetermination"/>
+ <phase name="MessageOut"/>
+ </phaseOrder>
+ </pre>
+
+<p>Shown in green, the custom phase "loggingPhase" is placed in all the
+flows, hence that phase will be called in all the message flows in the
+engine. Since our module is associated with this phase, the LogHandler inside
+the module now will be executed in this phase.</p>
+
+<h4><a name="Step5_:_Modify_the_"services_xml"">Step5 : Modify the
+"services.xml"</a></h4>
+
+<p>Up to this point we have created the required classes and configuration
+descriptions for the logging module and by changing the "axis2.xml" we have
+created the required phases for the logging module. Next step is to
+"<b>engage</b>" (use) this module in one of our services. For this, let's use
+the same Web Service that we have used throughout the user's guide,
+MyService. However, since we need to modify the "services.xml" of MyService
+in order to engage this module, we use a separate Web Service, but with the
+similar operations. The code for this service can be found in the
+"Axis2Home/samples/userguide/src/userguide/example2" directory. The simple
+changes that we have done to "services.xml' are shown in green in the
+following lines of xml.</p>
+<pre><service name="<font color="#33cc00">MyServiceWithModule</font>">
+ <description>
+ This is a sample Web Service with a logging module engaged.
+ </description>
+ <font color="#33cc00"><module ref="logging"/></font>
+ <parameter name="ServiceClass" locked="xsd:false">userguide.example2.MyService</parameter>
+ <operation name="echo">
+ <messageReceiver class="org.apache.axis2.receivers.RawXMLINOutMessageReceiver"/>
+ </operation>
+ <operation name="ping">
+ <messageReceiver class="org.apache.axis2.receivers.RawXMLINOutMessageReceiver"/>
+ </operation>
+</service></pre>
+
+<p>In this example we have changed the service name (the implementation class
+is very similar to what we have used earlier although it is in a different
+package). In addition we have added the line <b>"<module
+ref="logging"/>"</b> to "services.xml". This informs the Axis2 engine that
+the module "logging" should be engaged for this service. The handler inside
+the module will be executed in their respective phases as described by the
+"module.xml".</p>
+
+<p><b><a name="Step6_:_Packaging">Step6 : Packaging</a></b></p>
+
+<p>Before deploying the module we need to create the ".mar" file for this
+module. This can be done, using the "jar" command and then renaming the
+created jar file. Or you can find the "Logging.mar" that is already created
+for you in the "Axis2Home/samples/userguide" directory.</p>
+
+<h4><a name="Step7_:_Deploy_the_Module_in_Axis2">Step7 : Deploy the Module in
+Axis2</a></h4>
+
+<p>Deploying a module in Axis2 require the user to create a directory with
+the name "modules" in the "webapps/axis2/WEB-INF" directory of their servlet
+container and then copying the ".mar" file to that directory. So let's first
+create the "modules" directory and drop the "LoggingModule.mar" in to this
+directory.</p>
+
+<p>Although the required changes to the "services.xml" is very little, we
+have created a separate service archive (MyServiceWithModule.aar) for users
+to deploy and see. Deploy this service using the <a
+href="userguide2.html#Step4_:Deploy_the_Web_Service">same steps that you used
+to deploy "MyService"</a> and copy the "LoggingModule.mar" file to the
+"modules" directory. Then run using the "TestWebServiceWithModuleClient.bat"
+or "TestWebServiceWithModuleClient.sh" in the
+"Axis2Home/samples/userguide/src/userguide/clients/bin" directory.</p>
+
+<p>Note: To see the logs, the user needs to modify the "log4j.properties" to
+log INFO. The property file is located in "webapps\axis2\WEB-INF\classes" of
+your servlet container. Change the line "log4j.rootCategory= ERROR, LOGFILE"
+to "log4j.rootCategory=INFO, ERROR, LOGFILE".</p>
+
+<p align="right"><a href="userguide3.html"><img src="images/arrow_left.gif">
+Previous</a> | <a href="userguide5.html">Next <img
+src="images/arrow_right.gif"></a></p>
+
+<p>Pages: <a href="userguide.html">Content</a>, <a
+href="userguide1.html">1</a>, <a href="userguide2.html">2</a>,<a
+href="userguide3.html"> 3</a>, <b>4</b>, <a href="userguide5.html">5</a></p>
+</body>
+</html>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+ <meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
+ <title>Axis2 User's Guide</title>
+ <meta name="generator" content="amaya 9.2.1, see http://www.w3.org/Amaya/">
+</head>
+
+<body lang="en-US" dir="ltr">
+<h4><a name="Axis2_User's_Guide">Axis2 User's Guide</a></h4>
+
+<p><i>Version 0.95</i></p>
+<i>User Feedback: <a
+href="mailto:axis-user@ws.apache.org">axis-user@ws.apache.org</a></i>
+
+<p align="right">Pages: <a href="userguide.html">Content</a>, <a
+href="userguide1.html">1</a>, <a href="userguide2.html">2</a>, <a
+href="userguide3.html">3</a>, <a href="userguide4.html">4</a>,
+<b>5</b></p>
+
+<p><font size="4"><b>Note (on samples):</b></font> All the user's guide
+samples are located in the <b>"samples/userguide/src"</b> directory of the
+binary distribution.</p>
+
+<h2><a name="Other_Samples">Other Samples</a></h2>
+
+<p>To show the power of usage of Axis2, three standard samples are shipped
+with the binary distribution. These are meant to interact with outside web
+services and prove the capabilities of the Axis2 system.</p>
+
+<p>The included samples are</p>
+<ul>
+ <li><style="margin-bottom: 0in">Google spell checker sample</li>
+ <li><p style="margin-bottom: 0in">Google search sample</p>
+ </li>
+ <li><p style="margin-bottom: 0in">Amazon queuing sample</p>
+ </li>
+</ul>
+
+<p>A simple introduction to each of the above samples are given below. Each
+sample contains it's own help document that speaks about the usage and the
+advanced operations of that particular sample.</p>
+
+<p>The most obvious place to look for the samples are the binary
+distribution. All these samples are included in the samples directory in the
+binary distribution. The shell scripts and the batch files are in fact
+written to use the binary distribution's root directory as the home in order
+to find the libraries.</p>
+
+<p>The alternate method is to build the samples from source. Moving to the
+modules/samples and running maven will create the samples in the
+target/samples directory. However if the samples need to be started using the
+shell scripts (or the batch files) then the AXIS_HOME environment need to be
+set.( the "guessed" AXIS_HOME would not be correct in this case)</p>
+
+<h3><a name="Google_Spell_Checker_Sample">Google Spell Checker Sample</a></h3>
+
+<p>This includes a spell checker program that uses the Google spell checking
+service. It demonstrates the blocking and non-blocking modes of calling the
+service. This sample can be found at the samples\googleSpellcheck directory
+and can be easily started using either the batch file or the shell script.</p>
+
+<h3><a name="Google_Search_Sample">Google Search Sample</a></h3>
+
+<p>This includes a search program that uses the familiar Google search over
+the SOAP API. It utilizes the non-blocking mode of the client API. This
+sample can be found at the samples\googleSearch directory and can be easily
+started using either the batch file or the shell script.</p>
+
+<h3><a name="Amazon_Queuing_Service">Amazon Queuing Service</a></h3>
+
+<p>Amazon queuing service sample shows how to use the Amazon queuing service.
+It has two user interfaces , one to enqueue and the other dequeue. This
+sample is included in the samples\amazonQS directory and also contains the
+batch/shell scripts required to run sample.</p>
+
+<p align="right"><a href="userguide4.html"><img src="images/arrow_left.gif">
+Previous Page</a></p>
+
+<p>Pages: <a href="userguide.html">Content</a>, <a
+href="userguide1.html">1</a>, <a href="userguide2.html">2</a>, <a
+href="userguide3.html">3</a>, <a href="userguide4.html">4</a>, <b>5</b></p>
+</body>
+</html>
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+<!-- saved from url=(0022)http://internet.e-mail -->
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html>
+<head>
+ <meta http-equiv="content-type" content="">
+ <title>Axis2 administartion guide</title>
+</head>
+
+<body lang="en">
+<h1 align="center">Axis2 Web Administration Guide</h1>
+
+<p><i>Version 0.95</i></p>
+<i>Feedback: <a
+href="mailto:axis-dev@ws.apache.org">axis-dev@ws.apache.org</a></i>
+
+<h3>Contents</h3>
+<ul>
+ <li><a href="#Intro">Introduction</a>
+ <ul>
+ <li><p><a href="#login">Login into Administration Site</a></p>
+ </li>
+ </ul>
+ </li>
+ <li><a href="#adminoptions">Administration Options</a>
+ <ul>
+ <li><p><a href="#tools">Tools</a></p>
+ <ul>
+ <li><a href="#upservice">Upload Service</a></li>
+ </ul>
+ </li>
+ <li><p><a href="#syscomponents">System components</a></p>
+ <ul>
+ <li><a href="#heading1">Available services</a></li>
+ <li><a href="#servgroups">Available service groups</a></li>
+ <li><a href="#avmodules">Available modules</a></li>
+ <li><a href="#globalmodules">Globally engaged modules</a></li>
+ <li><a href="#phases">Available phases</a></li>
+ </ul>
+ </li>
+ <li><p><a href="#executionchains">Execution chains</a></p>
+ <ul>
+ <li><a href="#globalchains">Global chains</a></li>
+ <li><a href="#operationchains">Operation specific chains</a></li>
+ </ul>
+ </li>
+ <li><p><a href="#engaginmodule">Engage module</a></p>
+ </li>
+ <li><a href="#services">Services</a>
+ <ul>
+ <li><a href="#turnoffservice">Inacivate Service</a></li>
+ <li><a href="#turnonservice">Acivate Service</a></li>
+ <li><a href="#editservicepara">Edit service parameters</a></li>
+ </ul>
+ </li>
+ <li><p><a href="#context">Contexts</a></p>
+ <ul>
+ <li><a href="#viewhierarchy">View Hierarchy</a></li>
+ </ul>
+ </li>
+ </ul>
+ </li>
+</ul>
+<a name="Intro">
+<h3>Introduction</h3>
+
+<p>Axis2 Web Administration Module provides a way to configure Axis2
+dynamically. It's important to note that this dynamic configuration will NOT
+be persistent, i.e. if the servlet container is restarted then all the
+dynamic configuration changes will be lost.</p>
+<a name="login">
+<h4>Login into Administration Site</h4>
+
+<p>From <a href="#homepage">Axis2 Web Application Home page</a> you can go to
+Administration page by following 'Administration' link, then login page shown
+below will appear requesting user name and a password. The default user name
+is 'admin' (without quotes) and default password is 'axis2' (without
+quotes).</p>
+
+<p align="center"><img alt="" src="images/adminlogin.jpg"></p>
+
+<p>You can change the user name & password values by changing following
+two parameters in axis2.xml as required.</p>
+
+<p align="center"><img alt="" src="images/parameters.jpg"></p>
+
+<p>If the login is successful you will see the screen below. This is where
+you can view the configuration and the state of the running system and
+dynamically configure it.</p>
+
+<p align="center"><img alt="" src="images/admin.jpg"></p>
+
+ <a name="adminoptions"/>
+<h3>Administration Options</h3>
+<ul>
+ <a name="tools"/>
+ <b>Tools</b>
+ <ul>
+ <li><a href="#upservice">Upload Service</a></li>
+ </ul>
+ <a name="syscomponents"/>
+ <b>System components</b>
+ <ul>
+ <li><a href="#heading1">Available services</a></li>
+ <li><a href="#servgroups">Available service groups</a></li>
+ <li><a href="#avmodules">Available modules</a></li>
+ <li><a href="#globalmodules">Globally engaged modules</a></li>
+ <li><a href="#phases">Available phases</a></li>
+ </ul>
+ <a name="executionchains"/>
+ <b>Execution chains</b>
+ <ul>
+ <li><a href="#globalchains">Global chains</a></li>
+ <li><a href="#operationchains">Operation specific chains</a></li>
+ </ul>
+ <b><a href="#engaginmodule">Engage module</a></b> <br/>
+ <br/>
+ <a name="services"/>
+ <b>Services</b>
+ <ul>
+ <li><a href="#turnoffservice">Inactivate service</a></li>
+ <li><a href="#turnonservice">Activate service</a></li>
+ <li><a href="#editservicepara">Edit service parameters</a></li>
+ </ul>
+ <a name="context"/>
+ <b>Contexts</b>
+ <ul>
+ <li><a href="#viewhierarchy">View Hierarchy</a></li>
+ </ul>
+</ul>
+
+ <a name="homepage"/>
+<h3>Axis2 Web Application Home Page</h3>
+
+<p align="center"><strong><img alt="" src="images/clip_image006.jpg"></strong></p>
+
+ <a name="upservice"/>
+<h3>Upload Services</h3>
+
+<p>You can upload packaged Axis2<em> </em>service archive files using this
+page. This can be done in two simple steps:</p>
+<ul>
+ <li>Browse to the location and select the axisService archive file you wish
+ to upload</li>
+ <li>then click Upload</li>
+</ul>
+
+<p align="center"><img alt="" src="images/clip_image010.jpg"></p>
+
+<a name="heading1"></a>
+<h3>Available Services</h3>
+
+<p>The functionality of the 'Available Services' option is almost same as the
+functionality of Axis2 Web Application Home page 'Services' option where it
+displays the list of deployed services. But as an additional feature, if
+there are any modules engaged globally to services or operations those
+details will also be displayed here.</p>
+
+<p><strong>Faulty services</strong> of this system will also be listed on this page. Click on each faulty service, it will take you to a page that lists the exception stack trace of the excpetion that caused service to be faulty</p>
+
+<p align="center"><img alt="" src="images/adminmain.jpg"></p>
+
+<a name="servgroups"></a>
+<h3>Available Service Groups</h3>
+
+<p>Service group is a logical collection of set of services and 'Available
+Service Groups' link will list all the available service groups in the system
+.</p>
+
+<p align="center"><img alt="" src="images/servicegroups.jpg"></p>
+
+<a name="avmodules"></a>
+<h3>Available Modules</h3>
+
+<p>To view the available modules in the 'modules' directory of the
+'repository' click 'Available Modules' link. This will show you all the
+available modules in the system. Those modules can be engaged dynamically.</p>
+
+<p align="center"><img alt="" src="images/modules.jpg"></p>
+<br/>
+
+<a name="globalmodules"></a>
+<h3>Globally Engaged Modules</h3>
+
+<p>From the 'Globally Engaged Modules' link you can view globally engaged
+modules, if any. If a module was engaged globally then the handlers that
+belong to that module will be executed irrespective of the service.</p>
+<br/>
+
+<a name="phases"></a>
+<h3>Available Phases</h3>
+
+<p>'Available Phases' link will display all the available phases. In Axis2
+there are two levels of phases:</p>
+<ul>
+ <li>System predefined phases (not allowed to be changed)</li>
+ <li>User defined phases</li>
+</ul>
+
+<p>The main difference between these two levels is that system predefined
+phases will be invoked irrespective of the services, while user defined
+phases will be invoked when the dispatcher finds the operation. Note that it
+is essential for module developers and service writers to have a good
+understanding of phases and phase ordering.</p>
+<p align="center"><img alt="" src="images/viewphases.jpg"></p><br/>
+
+<a name="globalchains"></a>
+<h3>Global Chains</h3>
+
+<p>'Global Chains' link will display all the Global Execution Chains. The
+most interesting feature of Axis2 Web Administration Module is that it
+provides a very basic way of viewing the global phase list and handlers
+inside the phases depending on both phase and handler orders. This kind of
+information is extremely useful in debugging the system, as there is no other
+way to list out handlers in the global chains. If you engage a new module,
+the new handlers will be added to the global chains and displayed on this
+page.</p>
+
+<p align="center"><img alt="" src="images/globalchain.jpg"></p>
+<br/>
+
+<a name="operationchains"></a>
+<h3>Operation Specific Chains</h3>
+
+<p>The 'Operation Specific Chains' link can be used to view the handlers
+corresponding to a given service in the same order as it is in the real
+execution chain.</p>
+
+<p align="center"><img alt="" src="images/select_service_for_handler.jpg"></p><br/>
+
+<p>Select service of which's service handlers you wish to view from list box, and click on 'View' button to view handlers. The page below shows service handlers of service <em>version</em></p>
+
+<p align="center"><img alt="" src="images/serviceHandlers.jpg"></p>
+<br/>
+
+<a name="engaginmodule"></a>
+<h3>Engaging Modules</h3>
+
+<p>'Engaging Modules' link allows to engage modules either globally (to all
+services), to a service group, to a service or to an operation depending on
+the module implementation. If the module was designed to engage the handlers
+globally then handlers in the module can be included in any phase in the
+system. It can be either system predefined or user defined phase.</p>
+
+<p>On the other hand, if the module was implemented in such a way that it is
+going to be deployed to a service or to an operation, then the module cannot
+be included in any of the <a href="#phases">System Predefined Phases</a>.
+Thus it can only be included in <a href="#phases">User Defined Phases</a>.</p>
+
+<p>Immediately after engaging the module you can see the status of engagement
+indicating whether it is engaged properly or not.</p>
+
+<p align="center"><img alt="" src="images/moduleengage.jpg"></p>
+
+<p> </p>
+
+<a name="turnoffservice"></a>
+<h3>Inactivate Service</h3>
+
+<p>This functionality provide a way to remove unnecessary services from the
+running system, but the removal is transient which means if you restart the
+system the service will be available.</p>
+
+<p>To inactivate service, select service from list box, tick 'Inactivate service' check box, then click on 'Inactivate' button. 'Clear' button will clear the 'Inactivate service' check box</p>
+
+<p align="center"><img alt="" src="images/inactivate.jpg"></p>
+<br/>
+
+<a name="turnonservice"></a><h3>Activate Service</h3>
+<p>This functionality provide a way to activate services while the system is running, but the activation is transient which means if you restart the
+system the service will be inactive.</p>
+
+<p>To activate service, select service from list box, tick 'Activate service' check box, then click on 'Activate' button. 'Clear' button will clear the 'Activate service' check box</p>
+
+<p align="center"><img alt="" src="images/activate.jpg"></p>
+<br/>
+
+<a name="editservicepara"></a>
+<h3>Edit Service Parameters</h3>
+
+<p>This functionality provide a way to change parameters in a service or its
+operations.These changes will be transient too, which means if you restart
+the system changes will not be reflected.</p>
+
+<p>The Edit Parameters link under servies on navigation bar will link to page where you can select service to edit Parameters. Once service is selected click on 'Edit Parameters' button. This will lead to page below.</p>
+
+<p align="center"><img alt="" src="images/editserviecpara.jpg"></p>
+
+<a name="viewhierarchy"></a>
+<h3>View Hierarchy</h3>
+
+<p>By listing current context hierarchy 'View Hierarchy' link provides a
+means to look at the run time system. This will list out all the available
+service group contexts , service contexts , operation context and etc.</p>
+
+<p></p>
+</body>
+</html>