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| |
| <h1><a name="iPOJOJMXHandler-iPOJOJMXHandler"></a>iPOJO JMX Handler</h1> |
| |
| <p><em>This handler provides JMX management of component instance. It |
| could be useful to manage instance remotely. As the handler exposes |
| MBeans, you must have a MBean server running on your platform (as the |
| platform MBean server or the MOSGi MBean Server).</em></p> |
| |
| <div class="toc"> |
| <ul> |
| <li><a href="#iPOJOJMXHandler-Features">Features</a></li> |
| <li><a href="#iPOJOJMXHandler-Prerequisites">Prerequisites</a></li> |
| <li><a href="#iPOJOJMXHandler-Download">Download</a></li> |
| <li><a href="#iPOJOJMXHandler-Howtouseit">How to use it</a></li> |
| <li><a href="#iPOJOJMXHandler-JMXHandleroptions">JMX Handler options</a></li> |
| <li><a href="#iPOJOJMXHandler-Globalhandlerattributes">Global handler attributes</a></li> |
| <li><a href="#iPOJOJMXHandler-Propertiesattributes">Properties attributes</a></li> |
| <li><a href="#iPOJOJMXHandler-Methodsattributes">Methods attributes</a></li> |
| <li><a href="#iPOJOJMXHandler-Examples">Examples</a></li> |
| <ul> |
| <li><a href="#iPOJOJMXHandler-ExposingAttributes">Exposing Attributes</a></li> |
| <li><a href="#iPOJOJMXHandler-ExposingMethods">Exposing Methods</a></li> |
| <li><a href="#iPOJOJMXHandler-AttributeNotifications%253A">Attribute Notifications:</a></li> |
| </ul> |
| <li><a href="#iPOJOJMXHandler-Configuringthehandlerwithannotations">Configuring the handler with annotations</a></li> |
| </ul></div> |
| |
| <h2><a name="iPOJOJMXHandler-Features"></a>Features</h2> |
| |
| <p>The handler allows to:</p> |
| <ul> |
| <li>Expose attributes accessible via JMX (with rights management).</li> |
| <li>Expose methods to be called through JMX.</li> |
| <li>Get notifications when attributes are modified .</li> |
| </ul> |
| |
| |
| <h2><a name="iPOJOJMXHandler-Prerequisites"></a>Prerequisites</h2> |
| |
| <p>To be functional this handler must register on an MBean Server,thus |
| you obviously need it. Several servers are currently supported : the |
| standard platform MBean server (included in the JDK), MOSGi (provided |
| with Felix), ...<br> |
| To use MOSGi, you have to deploy at least the following three bundles of MOSGi:</p> |
| <ul> |
| <li>org.apache.felix.mosgi.jmx.agent</li> |
| <li>org.apache.felix.mosgi.jmx.registry</li> |
| <li>org.apache.felix.mosgi.jmx.rmiconnector</li> |
| </ul> |
| |
| |
| <p>You can find MOSGi documentation on <a href="http://cwiki.apache.org/FELIX/mosgi-managed-osgi-framework.html" rel="nofollow">http://cwiki.apache.org/FELIX/mosgi-managed-osgi-framework.html</a></p> |
| |
| <h2><a name="iPOJOJMXHandler-Download"></a>Download</h2> |
| |
| <p>The JMX handler is available in the Felix trunk in the iPOJO project. See the <a href="http://felix.apache.org/site/download.html" title="Download">Download</a> page to download and compile these sources.</p> |
| |
| <h2><a name="iPOJOJMXHandler-Howtouseit"></a>How to use it</h2> |
| |
| <p>The handler needs to be added in the metadata.xml, you just add a namespace (e.g., jmx) :</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag"><</span><span>ipojo xmlns:</span><span class="attribute">jmx</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.handlers.jmx"</span><span>> </span></td></tr><tr><td class="line2"> ... </td></tr><tr><td class="line1"><span class="tag"></</span><span>ipojo</span><span class="tag">></span><span> </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly"><ipojo xmlns:jmx="org.apache.felix.ipojo.handlers.jmx"> |
| ... |
| </ipojo></textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>So, you could now expose in JMX properties and methods of your component. They are surrounded by the <jmx:config><br> |
| tag.</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag"><</span><span>jmx:config</span><span class="tag">></span><span> </span></td></tr><tr><td class="line2"> <span class="tag"><</span><span>jmx:property </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"message"</span><span> </span><span class="attribute">field</span><span>=</span><span class="attribute-value">"m_msg"</span><span> </span><span class="attribute">rights</span><span>=</span><span class="attribute-value">"w"</span><span> </span><span class="attribute">notification</span><span>=</span><span class="attribute-value">"true"</span><span>/> </span></td></tr><tr><td class="line1"> <span class="tag"><</span><span>jmx:method </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"doSomethingBad"</span><span>/> </span></td></tr><tr><td class="line2"> <span class="tag"><</span><span>jmx:method </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"doSomethingGood"</span><span>/> </span></td></tr><tr><td class="line1"><span class="tag"></</span><span>jmx:config</span><span class="tag">></span><span> </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly"><jmx:config> |
| <jmx:property name="message" field="m_msg" rights="w" notification="true"/> |
| <jmx:method name="doSomethingBad"/> |
| <jmx:method name="doSomethingGood"/> |
| </jmx:config></textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <div class="panelMacro"><table class="infoMacro"><colgroup><col width="24"><col></colgroup><tbody><tr><td valign="top"><img src="ipojo-jmx-handler_files/information.gif" alt="" border="0" align="absmiddle" height="16" width="16"></td><td><b>Serialization</b><br><p>Be |
| careful that the argument and return type of methods must be |
| serializable. In case of several methods have the same name, each of |
| them will be exposed.</p></td></tr></tbody></table></div> |
| |
| <h2><a name="iPOJOJMXHandler-JMXHandleroptions"></a>JMX Handler options</h2> |
| |
| <p>Here you can find all configuration options of the JMX handler. |
| There are two kinds of manageable elements : properties and methods. |
| First is described the global configuration of the handler. Then |
| elements can be configured, using several attributes, as described |
| below.</p> |
| |
| <h2><a name="iPOJOJMXHandler-Globalhandlerattributes"></a>Global handler attributes</h2> |
| <div class="borderedTable"><table class="confluenceTable"><tbody> |
| <tr> |
| <th class="confluenceTh">Attribute name </th> |
| <th class="confluenceTh"> Required </th> |
| <th class="confluenceTh"> Description</th> |
| </tr> |
| <tr> |
| <td class="confluenceTd">objectName</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">The complete object name of the managed |
| component. The syntax of this attribute must be compliant with the |
| ObjectName syntax, detailed in the JMX specification.<br> |
| If neither domain nor name attributes are specified, the default value |
| is determined by the package, the type and the instance name of the |
| component. This attribute overrides the domain and name attributes.<br> |
| <em>Example:</em> "my.domain:type=myType,name=myName"</td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">domain</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">The domain of the managed object (i.e., the |
| left part of the object name). This attribute must be compliant with |
| the domain syntax, as described in the JMX specification.<br> |
| <em>Example:</em> "my.domain"</td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">name</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">The name property of the managed object. The |
| value of this attribute must comply with the ObjectName value syntax, |
| as described in the JMX specification.</td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">usesMOSGi</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">Determines if the component must be register on the MOSGi MBean server or not.</td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">preRegister <br> |
| postRegister <br> |
| preDeregister<br> |
| postDeregister</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">These attributes allow to specify methods to |
| carry out operations before and after being registered or unregistered |
| from the MBean server.</td> |
| </tr> |
| </tbody></table></div> |
| |
| <h2><a name="iPOJOJMXHandler-Propertiesattributes"></a>Properties attributes</h2> |
| <div class="borderedTable"><table class="confluenceTable"><tbody> |
| <tr> |
| <th class="confluenceTh">Attribute name</th> |
| <th class="confluenceTh">Required</th> |
| <th class="confluenceTh">Description</th> |
| </tr> |
| <tr> |
| <td class="confluenceTd">field</td> |
| <td class="confluenceTd">YES</td> |
| <td class="confluenceTd">The name of the component's field to expose.</td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">name</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">The name of the property as it will appear in JMX. If unspecified, the default value is the name of the exposed field.</td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">rights</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">Specify the access permission of the exposed field. The accepted values are : |
| <ul> |
| <li>"r" : read-only access, the default value.</li> |
| <li>"w" : read and write access.</li> |
| </ul> |
| </td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">notification</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">Enable or disable attribute change |
| notification sending for this property. If set to "true", a |
| notification is sent each time the value of the field changes.</td> |
| </tr> |
| </tbody></table></div> |
| <h2><a name="iPOJOJMXHandler-Methodsattributes"></a>Methods attributes</h2> |
| <div class="borderedTable"><table class="confluenceTable"><tbody> |
| <tr> |
| <th class="confluenceTh">Attribute name</th> |
| <th class="confluenceTh">Required</th> |
| <th class="confluenceTh">Description</th> |
| </tr> |
| <tr> |
| <td class="confluenceTd">name</td> |
| <td class="confluenceTd">YES</td> |
| <td class="confluenceTd">The name of the method to expose. If multiple methods have the same name, all of them are exposed.</td> |
| </tr> |
| <tr> |
| <td class="confluenceTd">description</td> |
| <td class="confluenceTd">NO</td> |
| <td class="confluenceTd">The description of the exposed method, as it will appear in JMX.</td> |
| </tr> |
| </tbody></table></div> |
| |
| <h2><a name="iPOJOJMXHandler-Examples"></a>Examples</h2> |
| |
| <p>In this part, we will give you a complete example of a component managed with JMX, using the JConsole provided by the SUN JDK.</p> |
| |
| <h3><a name="iPOJOJMXHandler-ExposingAttributes"></a>Exposing Attributes</h3> |
| |
| <p>In first time we create a simple component named MyComponent. We have add two fields named m_level (int) and m_message (String).</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-c" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> </span></td></tr><tr><td class="line2">MyComponent ... { </td></tr><tr><td class="line1"> <span class="comment">// Exposed attributes</span><span> </span></td></tr><tr><td class="line2"> <span class="keyword">private</span><span> String m_message; </span></td></tr><tr><td class="line1"> <span class="keyword">private</span><span> int m_level; </span></td></tr><tr><td class="line2">} </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">public class |
| MyComponent ... { |
| // Exposed attributes |
| private String m_message; |
| private int m_level; |
| }</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>We expose now the attributes in the jmx:config<br> |
| tag in the metadata :</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag"><?</span><span>xml </span><span class="attribute">version</span><span>=</span><span class="attribute-value">"1.0"</span><span> </span><span class="attribute">encoding</span><span>=</span><span class="attribute-value">"UTF-8"</span><span>?> </span></td></tr><tr><td class="line2"><span class="tag"><</span><span>iPOJO xmlns:</span><span class="attribute">jmx</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.handlers.jmx"</span><span>> </span></td></tr><tr><td class="line1"> <span class="tag"><</span><span>component </span><span class="attribute">className</span><span>=</span><span class="attribute-value">"...MyComponent"</span><span> </span></td></tr><tr><td class="line2"> <span class="attribute">architecture</span><span>=</span><span class="attribute-value">"true"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">immediate</span><span>=</span><span class="attribute-value">"true"</span><span>> </span></td></tr><tr><td class="line2"> </td></tr><tr><td class="line1"> <span class="tag"><</span><span>provides</span><span class="tag">/></span><span> </span></td></tr><tr><td class="line2"> <span class="tag"><</span><span>jmx:config</span><span class="tag">></span><span> </span></td></tr><tr><td class="line1"> <span class="comments"><!-- Exposed properties --></span><span> </span></td></tr><tr><td class="line2"> <span class="tag"><</span><span>jmx:property </span><span class="attribute">field</span><span>=</span><span class="attribute-value">"m_level"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">name</span><span>=</span><span class="attribute-value">"The level"</span><span> </span></td></tr><tr><td class="line2"> <span class="attribute">rights</span><span>=</span><span class="attribute-value">"r"</span><span>/> </span></td></tr><tr><td class="line1"> <span class="tag"><</span><span>jmx:property </span><span class="attribute">field</span><span>=</span><span class="attribute-value">"m_message"</span><span> </span></td></tr><tr><td class="line2"> <span class="attribute">name</span><span>=</span><span class="attribute-value">"The message"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">rights</span><span>=</span><span class="attribute-value">"w"</span><span>/> </span></td></tr><tr><td class="line2"> <span class="tag"></</span><span>jmx:config</span><span class="tag">></span><span> </span></td></tr><tr><td class="line1"> <span class="tag"></</span><span>component</span><span class="tag">></span><span> </span></td></tr><tr><td class="line2"> <span class="tag"><</span><span>instance </span></td></tr><tr><td class="line1"> <span class="attribute">component</span><span>=</span><span class="attribute-value">"...MyComponent"</span><span>/> </span></td></tr><tr><td class="line2"><span class="tag"></</span><span>iPOJO</span><span class="tag">></span><span> </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly"><?xml version="1.0" encoding="UTF-8"?> |
| <iPOJO xmlns:jmx="org.apache.felix.ipojo.handlers.jmx"> |
| <component className="...MyComponent" |
| architecture="true" |
| immediate="true"> |
| |
| <provides/> |
| <jmx:config> |
| <!-- Exposed properties --> |
| <jmx:property field="m_level" |
| name="The level" |
| rights="r"/> |
| <jmx:property field="m_message" |
| name="The message" |
| rights="w"/> |
| </jmx:config> |
| </component> |
| <instance |
| component="...MyComponent"/> |
| </iPOJO></textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>Now, we could get and write the properties in the JConsole :<br> |
| <img src="ipojo-jmx-handler_files/JMXHandler_1.png" border="0" align="absmiddle"></p> |
| |
| <h3><a name="iPOJOJMXHandler-ExposingMethods"></a>Exposing Methods</h3> |
| |
| <p>We could now add methods in the initial class :</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-c" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="comment">/**</span></td></tr><tr><td class="line2"><span class="comment">Do something good</span></td></tr><tr><td class="line1"><span class="comment">*/</span><span> </span></td></tr><tr><td class="line2"><span class="keyword">public</span><span> </span><span class="keyword">void</span><span> doSomethingGood() { </span></td></tr><tr><td class="line1"> ... </td></tr><tr><td class="line2">} </td></tr><tr><td class="line1"> </td></tr><tr><td class="line2"><span class="comment">/**</span></td></tr><tr><td class="line1"><span class="comment">Do something bad</span></td></tr><tr><td class="line2"><span class="comment">*/</span><span> </span></td></tr><tr><td class="line1"><span class="keyword">public</span><span> </span><span class="keyword">void</span><span> doSomethingBad() { </span></td></tr><tr><td class="line2"> ... </td></tr><tr><td class="line1">} </td></tr><tr><td class="line2"> </td></tr><tr><td class="line1"><span class="comment">/**</span></td></tr><tr><td class="line2"><span class="comment">Do nothing</span></td></tr><tr><td class="line1"><span class="comment">*/</span><span> </span></td></tr><tr><td class="line2"><span class="keyword">public</span><span> </span><span class="keyword">void</span><span> doNothing() { </span></td></tr><tr><td class="line1"> ... </td></tr><tr><td class="line2">} </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">/** |
| Do something good |
| */ |
| public void doSomethingGood() { |
| ... |
| } |
| |
| /** |
| Do something bad |
| */ |
| public void doSomethingBad() { |
| ... |
| } |
| |
| /** |
| Do nothing |
| */ |
| public void doNothing() { |
| ... |
| }</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>We add corresponding tags in the metadata to expose these methods:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="comments"><!-- Exposed methods --></span><span> </span></td></tr><tr><td class="line2"><span class="tag"><</span><span>jmx:method </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"doSomethingGood"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">description</span><span>=</span><span class="attribute-value">"Do something good."</span><span>/> </span></td></tr><tr><td class="line2"><span class="tag"><</span><span>jmx:method </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"doSomethingBad"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">description</span><span>=</span><span class="attribute-value">"Do something bad."</span><span>/> </span></td></tr><tr><td class="line2"><span class="tag"><</span><span>jmx:method </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"doNothing"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">description</span><span>=</span><span class="attribute-value">"Do absolutely nothing."</span><span>/> </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly"><!-- Exposed methods --> |
| <jmx:method name="doSomethingGood" |
| description="Do something good."/> |
| <jmx:method name="doSomethingBad" |
| description="Do something bad."/> |
| <jmx:method name="doNothing" |
| description="Do absolutely nothing."/></textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>Now the three methods are exposed in the operations tab of the JConsole. We can invoked these methods :</p> |
| |
| <p><img src="ipojo-jmx-handler_files/JMXHandler_2.png" border="0" align="absmiddle"></p> |
| |
| <h3><a name="iPOJOJMXHandler-AttributeNotifications:"></a>Attribute Notifications:</h3> |
| |
| <p>You could subscribe to attribute notification by adding the |
| notification attribute in property tag. In our example if we want to be |
| notified when m_level is modified, we change the property line in the |
| metatada like this:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag"><</span><span>jmx:property </span><span class="attribute">field</span><span>=</span><span class="attribute-value">"m_level"</span><span> </span></td></tr><tr><td class="line2"> <span class="attribute">name</span><span>=</span><span class="attribute-value">"The level"</span><span> </span></td></tr><tr><td class="line1"> <span class="attribute">rights</span><span>=</span><span class="attribute-value">"r"</span><span> </span></td></tr><tr><td class="line2"> <span class="attribute">notification</span><span>=</span><span class="attribute-value">"true"</span><span>/> </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly"><jmx:property field="m_level" |
| name="The level" |
| rights="r" |
| notification="true"/></textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>So now if we change the string through JConsole or if the POJO is |
| modified in other way, a notification will be sent to every listener. |
| For example, we subscribe in the notification tab, and we get |
| notification when the message changes :</p> |
| |
| <p><img src="ipojo-jmx-handler_files/JMXHandler_3.png" border="0" align="absmiddle"></p> |
| |
| <h2><a name="iPOJOJMXHandler-Configuringthehandlerwithannotations"></a>Configuring the handler with annotations</h2> |
| |
| <p>It is possible to configure the handler with simple annotations available with iPOJO annotations. Here is an example of usage:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-c" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="keyword">import</span><span> org.apache.felix.ipojo.annotations.Component; </span></td></tr><tr><td class="line2"><span class="keyword">import</span><span> org.apache.felix.ipojo.handlers.jmx.Config; </span></td></tr><tr><td class="line1"><span class="keyword">import</span><span> org.apache.felix.ipojo.handlers.jmx.Method; </span></td></tr><tr><td class="line2"><span class="keyword">import</span><span> org.apache.felix.ipojo.handlers.jmx.Property; </span></td></tr><tr><td class="line1"><span class="preprocessor"></span></td></tr><tr><td class="line2"><span class="preprocessor">@Component</span><span> </span></td></tr><tr><td class="line1"><span class="preprocessor">@Config(domain="my-domain", usesMOSGi=false)</span><span> </span></td></tr><tr><td class="line2"><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> JMXSimple { </span></td></tr><tr><td class="line1"><span class="preprocessor"></span></td></tr><tr><td class="line2"><span class="preprocessor"> @Property(name="prop", notification=true, rights="w") // Field published in the MBean</span><span> </span></td></tr><tr><td class="line1"> String m_foo; </td></tr><tr><td class="line2"><span class="preprocessor"> </span></td></tr><tr><td class="line1"><span class="preprocessor"> @Method(description="set the foo prop") // Method published in the MBean</span><span> </span></td></tr><tr><td class="line2"> <span class="keyword">public</span><span> </span><span class="keyword">void</span><span> setFoo(String mes) { </span></td></tr><tr><td class="line1"> System.out.println(<span class="string">"Set foo to "</span><span> + mes); </span></td></tr><tr><td class="line2"> m_foo = mes; </td></tr><tr><td class="line1"> } </td></tr><tr><td class="line2"><span class="preprocessor"> </span></td></tr><tr><td class="line1"><span class="preprocessor"> @Method(description="get the foo prop") // Method published in the MBean</span><span> </span></td></tr><tr><td class="line2"> <span class="keyword">public</span><span> String getFoo() { </span></td></tr><tr><td class="line1"> <span class="keyword">return</span><span> m_foo; </span></td></tr><tr><td class="line2"> } </td></tr><tr><td class="line1">} </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">import org.apache.felix.ipojo.annotations.Component; |
| import org.apache.felix.ipojo.handlers.jmx.Config; |
| import org.apache.felix.ipojo.handlers.jmx.Method; |
| import org.apache.felix.ipojo.handlers.jmx.Property; |
| |
| @Component |
| @Config(domain="my-domain", usesMOSGi=false) |
| public class JMXSimple { |
| |
| @Property(name="prop", notification=true, rights="w") // Field published in the MBean |
| String m_foo; |
| |
| @Method(description="set the foo prop") // Method published in the MBean |
| public void setFoo(String mes) { |
| System.out.println("Set foo to " + mes); |
| m_foo = mes; |
| } |
| |
| @Method(description="get the foo prop") // Method published in the MBean |
| public String getFoo() { |
| return m_foo; |
| } |
| }</textarea> |
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| </div> |
| |
| <p>The <tt>@org.apache.felix.ipojo.handlers.jmx.Config</tt> (<tt>@Config</tt> if the package it correctly imported) annotation is a type annotation (so placed on the <tt>class</tt> element. This annotation indicates that the instance will be exposed as an MBean. This annotation supports:</p> |
| <ul> |
| <li>usesMOSGi: set to <tt>true</tt> to use MOSGi. Otherwise, the MBean will be exposed in the MBean Platform Server (default: <tt>false</tt>).</li> |
| <li>objectname: set the MBean objectname. The objectname must follow JMX specification. (default: <tt>package-name:factory-name:instance-name</tt>)</li> |
| <li>domain: set the MBean domain. (default: <tt>package-name</tt>)</li> |
| <li>name: set the MBean name. (default: <tt>instance-name</tt>).</li> |
| </ul> |
| |
| |
| <p>The <tt>@org.apache.felix.ipojo.handlers.jmx.Property</tt> (<tt>@Property</tt>) annotation is a field annotation indicating that the field is exposed in the MBean. The supported attributes are:</p> |
| <ul> |
| <li>name: set the property name</li> |
| <li>rights: set the access permission. Possible values are <tt>r</tt> (read only) and <tt>w</tt> (read and write). By default, properties are in read-only mode.</li> |
| <li>notification: enables notification on this property. By default notifications are disabled.</li> |
| </ul> |
| |
| |
| <p>The <tt>@org.apache.felix.ipojo.handlers.jmx.Method</tt> (<tt>@Method</tt>) annotation is a method annotation indicating that the method is exposed in the MBean. Only one attribute can be customized:</p> |
| <ul> |
| <li>description: set the method description. |
| <br clear="all"> |
| <br clear="all"> |
| |
| </li></ul></div> |
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