PicoContainer example source code file (LifecycleComponentMonitor.java)

This example PicoContainer source code file (LifecycleComponentMonitor.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, exception, lifecyclecomponentmonitor, lifecyclefailuresexception, list, method, object, object, reflection, stringbuffer, util

The PicoContainer LifecycleComponentMonitor.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                                                          *
 *****************************************************************************/
package org.picocontainer.monitors;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Member;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

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

/**
 * A {@link ComponentMonitor} which collects lifecycle failures
 * and rethrows them on demand after the failures.
 * 
 * @author Paul Hammant
 * @author Mauro Talevi
 */
public final class LifecycleComponentMonitor implements ComponentMonitor {

    private final ComponentMonitor delegate;
    private final List lifecycleFailures = new ArrayList();

    public LifecycleComponentMonitor(ComponentMonitor delegate) {
        this.delegate = delegate;
    }

    public LifecycleComponentMonitor() {
        this(new NullComponentMonitor());
    }

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

    public void instantiated(PicoContainer container, ComponentAdapter componentAdapter,
                             Constructor constructor,
                             Object instantiated,
                             Object[] parameters,
                             long duration) {
        delegate.instantiated(container, componentAdapter, constructor, instantiated, parameters, duration);
    }

    public void instantiationFailed(PicoContainer container,
                                    ComponentAdapter componentAdapter,
                                    Constructor constructor,
                                    Exception cause) {
        delegate.instantiationFailed(container, componentAdapter, constructor, cause);
    }

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

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

    public void invocationFailed(Member member, Object instance, Exception cause) {
        delegate.invocationFailed(member, instance, cause);
    }

    public void lifecycleInvocationFailed(MutablePicoContainer container,
                                          ComponentAdapter componentAdapter, Method method,
                                          Object instance,
                                          RuntimeException cause) {
        lifecycleFailures.add(cause);
        try {
            delegate.lifecycleInvocationFailed(container, componentAdapter, method, instance, cause);
        } catch (PicoLifecycleException e) {
            // do nothing, exception already logged for later rethrow.
        }
    }

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


    public void rethrowLifecycleFailuresException() {
        throw new LifecycleFailuresException(lifecycleFailures);
    }

    /**
     * Subclass of {@link PicoException} that is thrown when the collected
     * lifecycle failures need to be be collectively rethrown.
     * 
     * @author Paul Hammant
     * @author Mauro Talevi
     */
    public final class LifecycleFailuresException extends PicoException {

        private final List lifecycleFailures;

        public LifecycleFailuresException(List lifecycleFailures) {
            this.lifecycleFailures = lifecycleFailures;
        }

        public String getMessage() {
            StringBuffer message = new StringBuffer();
            for (Object lifecycleFailure : lifecycleFailures) {
                Exception failure = (Exception)lifecycleFailure;
                message.append(failure.getMessage()).append(";  ");
            }
            return message.toString();
        }

        public Collection getFailures() {
            return lifecycleFailures;
        }
    }
}