PicoContainer example source code file (NullComponentMonitor.java)

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

Java - PicoContainer tags/keywords

componentadapter, componentadapter, componentmonitor, constructor, constructor, exception, io, member, method, nullcomponentmonitor, nullcomponentmonitor, object, object, picolifecycleexception, reflection, serializable

The PicoContainer NullComponentMonitor.java source code

/*****************************************************************************
 * Copyright (C) PicoContainer Organization. All rights reserved.            *
 * ------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the BSD      *
 * style license a copy of which has been included with this distribution in *
 * the LICENSE.txt file.                                                     *
 *                                                                           *
 * Original code by Paul Hammant & Obie Fernandez & Aslak Hellesøy    *
 *****************************************************************************/

package org.picocontainer.monitors;

import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Member;

import org.picocontainer.ComponentMonitor;
import org.picocontainer.PicoLifecycleException;
import org.picocontainer.ComponentAdapter;
import org.picocontainer.MutablePicoContainer;
import org.picocontainer.PicoContainer;

/**
 * A {@link ComponentMonitor} which does nothing. 
 * 
 * @author Paul Hammant
 * @author Obie Fernandez
 * @version $Revision: 3620 $
 */
public class NullComponentMonitor implements ComponentMonitor, Serializable {

    private static NullComponentMonitor instance;

    public Constructor instantiating(PicoContainer container, ComponentAdapter componentAdapter,
                                     Constructor constructor) {
        return constructor;
    }

    public void instantiationFailed(PicoContainer container,
                                    ComponentAdapter componentAdapter,
                                    Constructor constructor,
                                    Exception e) {
    }

    public void instantiated(PicoContainer container, ComponentAdapter componentAdapter,
                             Constructor constructor,
                             Object instantiated,
                             Object[] injected,
                             long duration) {
    }

    public void invoking(PicoContainer container,
                         ComponentAdapter componentAdapter,
                         Member member,
                         Object instance) {
    }

    public void invoked(PicoContainer container,
                        ComponentAdapter componentAdapter,
                        Method method,
                        Object instance,
                        long duration) {
    }

    public void invocationFailed(Member member, Object instance, Exception e) {
    }

    public void lifecycleInvocationFailed(MutablePicoContainer container,
                                          ComponentAdapter componentAdapter, Method method,
                                          Object instance,
                                          RuntimeException cause) {
        throw new PicoLifecycleException(method, instance, cause);
    }

    public Object noComponentFound(MutablePicoContainer container, Object componentKey) {
        return null;
    }

    public static synchronized NullComponentMonitor getInstance() {
        if (instance == null) {
            instance = new NullComponentMonitor();
        }
        return instance;
    }
}