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Java example source code file (Manager.java)

This example Java source code file (Manager.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotation, bad, class, injector, key, malformedobjectnameexception, managedbinding, management, manager, module, runtimeexception, string, stringbuilder

The Manager.java Java example source code

/**
 * Copyright (C) 2006 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.inject.tools.jmx;

import com.google.inject.Binding;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;

import java.lang.annotation.Annotation;
import java.lang.management.ManagementFactory;

import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

/**
 * Provides a JMX interface to Guice.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public class Manager {

  /**
   * Registers all the bindings of an Injector with the platform MBean server.
   * Consider using the name of your root {@link Module} class as the domain.
   */
  public static void manage(
      String domain,
      Injector injector) {
    manage(ManagementFactory.getPlatformMBeanServer(), domain, injector);
  }

  /**
   * Registers all the bindings of an Injector with the given MBean server.
   * Consider using the name of your root {@link Module} class as the domain.
   */
  public static void manage(MBeanServer server, String domain,
      Injector injector) {
    // Register each binding independently.
    for (Binding<?> binding : injector.getBindings().values()) {
      // Construct the name manually so we can ensure proper ordering of the
      // key/value pairs.
      StringBuilder name = new StringBuilder();
      name.append(domain).append(":");
      Key<?> key = binding.getKey();
      name.append("type=").append(quote(key.getTypeLiteral().toString()));
      Annotation annotation = key.getAnnotation();
      if (annotation != null) {
        name.append(",annotation=").append(quote(annotation.toString()));
      }
      else {
        Class<? extends Annotation> annotationType = key.getAnnotationType();
        if (annotationType != null) {
          name.append(",annotation=")
              .append(quote("@" + annotationType.getName()));
        }
      }

      try {
        server.registerMBean(new ManagedBinding(binding),
            new ObjectName(name.toString()));
      }
      catch (MalformedObjectNameException e) {
        throw new RuntimeException("Bad object name: " + name, e);
      }
      catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  }

  static String quote(String value) {
    // JMX seems to have a comma bug.
    return ObjectName.quote(value).replace(',', ';');
  }

  /**
   * Run with no arguments for usage instructions.
   */
  public static void main(String[] args) throws Exception {
    if (args.length != 1) {
      System.err.println("Usage: java -Dcom.sun.management.jmxremote "
          + Manager.class.getName() + " [module class name]");
      System.err.println("Then run 'jconsole' to connect.");
      System.exit(1);
    }

    Module module = (Module) Class.forName(args[0]).newInstance();
    Injector injector = Guice.createInjector(module);

    manage(args[0], injector);

    System.out.println("Press Ctrl+C to exit...");

    // Sleep forever.
    Thread.sleep(Long.MAX_VALUE);
  }
}

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