📄 jmx-instrumenting.xtp
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<document><header><product>resin</product><title>Instrumenting Resources</title><description><p>The facilities of JMX are a convenient way to provide an administrationinterface to objects and components in web applications. </p></description></header><body><summary/><s1 title="Instrumenting Resources"><p>Instrumenting resources so JMX can manage them consistsof the following steps:</p><ol><li>For a class <code>MyFoo</code>, create an interface <code>MyFooMBean</code> withthe management interface.</li><li>Class <code>MyFoo</code> needs to <var>implement</var> the <code>MyFooMBean</code> interface.</li><li>Register <code>MyFoo</code> with the JMX server.</li></ol><s2 title="Instrumenting a servlet"><p>Resin will automatically register any servlet whichimplement an MBean interface. By default, the JMX name will be:</p><def>web-app:j2eeType=Servlet,name=<var>servlet-name</var></def><deftable title="ObjectName attributes"><tr><th>Attribute</th><th>Value</th></tr><tr><td>j2eeType</td><td>Servlet</td></tr><tr><td>WebModule</td><td>the <var>contextPath</var></td></tr><tr><td>J2EEApplication</td><td>the host?</td></tr><tr><td>J2EEServer</td><td>the server-id?</td></tr></deftable><p>The domain is <var>web-app</var>, the type propertyis javax.servlet.Servlet and the name property is the valueof <servlet-name>.</p><p>JMX clients will use the name to manage the servlet. For example,a client might use the pattern <var>web-app:type=javax.servlet.Servlet,*</var>to retrieve all managed servlets.</p><example title="MyServletMBean.java">package test;public interface MyServletMBean { public int getCount();}</example><example title="MyServlet.java">package test;import java.io.*;import javax.servlet.*;public class MyServlet extends GenericServlet implements MyServletMBean { private int count; public int getCount() { return count; } public void service(ServletRequest request, ServletResponse response) throws IOException { PrintWriter out = response.getWriter(); count++; out.println("Hello, world"); }}</example></s2></s1><s1 title="Managing Resources"><p>Managing resources uses the JMX API, primarily usingthe <code>MBeanServer</code> object. In Resin, each web-app hasits own <code>MBeanServer</code>.</p><example title="Getting the Count attribute">import javax.management.*;...MBeanServer server = MBeanServerFactory.createMBeanServer();ObjectName name = new ObjectName("web-app:j2eeType=javax.servlet.Servlet," + "name=hello");Object value = server.getAttribute(name, "Count");out.println("Count: " + value);</example><s2 title="/resin-status"><p>The <a href="doc|jmx|servlet">resin-status servlet</a> has aprimitive generic JMX management view of JMX managed servlets.By adding a MBean interface to your servlet, you'll automatically geta view of your servlets from /resin-status.</p></s2></s1> </body></document>⌨️ 快捷键说明
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