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<h2 title="Class BCELMBeanInvoker" class="title">Class BCELMBeanInvoker</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../mx4j/server/ReflectionMBeanInvoker.html" title="class in mx4j.server">mx4j.server.ReflectionMBeanInvoker</a></li>
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<ul class="inheritance">
<li><a href="../../mx4j/server/CachingReflectionMBeanInvoker.html" title="class in mx4j.server">mx4j.server.CachingReflectionMBeanInvoker</a></li>
<li>
<ul class="inheritance">
<li>mx4j.server.BCELMBeanInvoker</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../mx4j/server/MBeanInvoker.html" title="interface in mx4j.server">MBeanInvoker</a></dd>
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<hr>
<br>
<pre>public class <span class="strong">BCELMBeanInvoker</span>
extends <a href="../../mx4j/server/CachingReflectionMBeanInvoker.html" title="class in mx4j.server">CachingReflectionMBeanInvoker</a></pre>
<div class="block">MBeanInvoker that generates on-the-fly implementations to call standard MBeans directly, instead of using reflection.
<br />
It uses the <a href="http://jakarta.apache.org/bcel">BCEL</a> to generate the required bytecode on-the-fly.
The generated class is named "mx4j.server.BCELMBeanInvokerGenerated", and it's loaded into the JVM by a different
classloader for each MBean. This classloader has the MBean classloader as parent. <br>
Below is an example of the generated code; beware that the management interface and all parameter's classes must be
public, otherwise an IllegalAccessError is thrown and the invocation falls back to use reflection (but with a significant
overhead - throwing an exception is expensive).
<pre>
public interface ServiceMBean
{
public void start();
public Collection getServices(ServiceSelector selector);
}
<p/>
public class BCELMBeanInvokerGenerated extends BCELMBeanInvoker
{
protected Object invokeImpl(MBeanMetaData metadata, String method, String[] signature, Object[] args)
throws Throwable
{
if (method.equals("start") && args.length == 0)
{
try
{
((ServiceMBean)metadata.mbean).start();
return null;
}
catch (ClassCastException x) {}
catch (IllegalAccessError x) {}
}
else if (method.equals("getServices") && args.length == 1)
{
try
{
return ((ServiceMBean)metadata.mbean).getServices((ServiceSelector)args[0]);
}
catch (ClassCastException x) {}
catch (IllegalAccessError x) {}
}
return super.invokeImpl(metadata, method, signature, args);
}
}
</pre></div>
<dl><dt><span class="strong">Version:</span></dt>
<dd>$Revision: 1.14 $</dd></dl>
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<h3>Fields inherited from class mx4j.server.<a href="../../mx4j/server/ReflectionMBeanInvoker.html" title="class in mx4j.server">ReflectionMBeanInvoker</a></h3>
<code><a href="../../mx4j/server/ReflectionMBeanInvoker.html#EMPTY_ARGS">EMPTY_ARGS</a>, <a href="../../mx4j/server/ReflectionMBeanInvoker.html#EMPTY_PARAMS">EMPTY_PARAMS</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier</th>
<th class="colLast" scope="col">Constructor and Description</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><strong><a href="../../mx4j/server/BCELMBeanInvoker.html#BCELMBeanInvoker()">BCELMBeanInvoker</a></strong>()</code> </td>
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<td class="colFirst"><code>static <a href="../../mx4j/server/MBeanInvoker.html" title="interface in mx4j.server">MBeanInvoker</a></code></td>
<td class="colLast"><code><strong><a href="../../mx4j/server/BCELMBeanInvoker.html#create(mx4j.server.MBeanMetaData)">create</a></strong>(<a href="../../mx4j/server/MBeanMetaData.html" title="interface in mx4j.server">MBeanMetaData</a> metadata)</code>
<div class="block">Creates a new MBeanInvoker created on-the-fly by using BCEL.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../mx4j/server/BCELMBeanInvoker.html#invokeImpl(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[], java.lang.Object[])">invokeImpl</a></strong>(<a href="../../mx4j/server/MBeanMetaData.html" title="interface in mx4j.server">MBeanMetaData</a> metadata,
java.lang.String method,
java.lang.String[] signature,
java.lang.Object[] args)</code>
<div class="block">Performs the actual invocation of the MBean's method.</div>
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<h3>Methods inherited from class mx4j.server.<a href="../../mx4j/server/CachingReflectionMBeanInvoker.html" title="class in mx4j.server">CachingReflectionMBeanInvoker</a></h3>
<code><a href="../../mx4j/server/CachingReflectionMBeanInvoker.html#getMethodForAttribute(javax.management.MBeanAttributeInfo, boolean)">getMethodForAttribute</a>, <a href="../../mx4j/server/CachingReflectionMBeanInvoker.html#getStandardAttributeInfo(mx4j.server.MBeanMetaData, java.lang.String, boolean)">getStandardAttributeInfo</a>, <a href="../../mx4j/server/CachingReflectionMBeanInvoker.html#getStandardManagementMethod(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[])">getStandardManagementMethod</a>, <a href="../../mx4j/server/CachingReflectionMBeanInvoker.html#getStandardOperationInfo(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[])">getStandardOperationInfo</a></code></li>
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<h3>Methods inherited from class mx4j.server.<a href="../../mx4j/server/ReflectionMBeanInvoker.html" title="class in mx4j.server">ReflectionMBeanInvoker</a></h3>
<code><a href="../../mx4j/server/ReflectionMBeanInvoker.html#doInvoke(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[], java.lang.Object[])">doInvoke</a>, <a href="../../mx4j/server/ReflectionMBeanInvoker.html#getAttribute(mx4j.server.MBeanMetaData, java.lang.String)">getAttribute</a>, <a href="../../mx4j/server/ReflectionMBeanInvoker.html#invoke(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[], java.lang.Object[])">invoke</a>, <a href="../../mx4j/server/ReflectionMBeanInvoker.html#setAttribute(mx4j.server.MBeanMetaData, javax.management.Attribute)">setAttribute</a></code></li>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<a name="BCELMBeanInvoker()">
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<h4>BCELMBeanInvoker</h4>
<pre>protected BCELMBeanInvoker()</pre>
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<h4>create</h4>
<pre>public static <a href="../../mx4j/server/MBeanInvoker.html" title="interface in mx4j.server">MBeanInvoker</a> create(<a href="../../mx4j/server/MBeanMetaData.html" title="interface in mx4j.server">MBeanMetaData</a> metadata)</pre>
<div class="block">Creates a new MBeanInvoker created on-the-fly by using BCEL.
It must be synchronized since BCEL is not thread safe, and uses static variables
(refer to org.apache.bcel.generic.Type.getArgumentTypes(...) for further details)</div>
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<h4>invokeImpl</h4>
<pre>protected java.lang.Object invokeImpl(<a href="../../mx4j/server/MBeanMetaData.html" title="interface in mx4j.server">MBeanMetaData</a> metadata,
java.lang.String method,
java.lang.String[] signature,
java.lang.Object[] args)
throws java.lang.Throwable</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../mx4j/server/ReflectionMBeanInvoker.html#invokeImpl(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[], java.lang.Object[])">ReflectionMBeanInvoker</a></code></strong></div>
<div class="block">Performs the actual invocation of the MBean's method.
Exceptions thrown by the MBean's methods should not be catched, since <a href="../../mx4j/server/ReflectionMBeanInvoker.html#doInvoke(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[], java.lang.Object[])"><code>ReflectionMBeanInvoker.doInvoke(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[], java.lang.Object[])</code></a>
takes care of converting them to JMX exceptions.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../mx4j/server/ReflectionMBeanInvoker.html#invokeImpl(mx4j.server.MBeanMetaData, java.lang.String, java.lang.String[], java.lang.Object[])">invokeImpl</a></code> in class <code><a href="../../mx4j/server/ReflectionMBeanInvoker.html" title="class in mx4j.server">ReflectionMBeanInvoker</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Throwable</code></dd></dl>
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