001/*****************************************************************************
002 * Copyright (C) PicoContainer Organization. All rights reserved.            *
003 * ------------------------------------------------------------------------- *
004 * The software in this package is published under the terms of the BSD      *
005 * style license a copy of which has been included with this distribution in *
006 * the LICENSE.txt file.                                                     *
007 *                                                                           *
008 * Original code by Paul Hammaant                                            *
009 *****************************************************************************/
010
011package org.picocontainer.monitors;
012
013import static org.picocontainer.monitors.ComponentMonitorHelper.ctorToString;
014import static org.picocontainer.monitors.ComponentMonitorHelper.format;
015import static org.picocontainer.monitors.ComponentMonitorHelper.memberToString;
016import static org.picocontainer.monitors.ComponentMonitorHelper.methodToString;
017import static org.picocontainer.monitors.ComponentMonitorHelper.parmsToString;
018
019import java.io.PrintWriter;
020import java.io.Writer;
021import java.lang.reflect.Constructor;
022import java.lang.reflect.Member;
023import java.lang.reflect.Method;
024
025import org.picocontainer.ComponentAdapter;
026import org.picocontainer.ComponentMonitor;
027import org.picocontainer.MutablePicoContainer;
028import org.picocontainer.PicoContainer;
029import org.picocontainer.Injector;
030import org.picocontainer.Behavior;
031
032/**
033 * A {@link ComponentMonitor} which writes to a {@link Writer}. 
034 * 
035 * @author Paul Hammant
036 * @author Aslak Hellesøy
037 * @author Mauro Talevi
038 */
039public class WriterComponentMonitor implements ComponentMonitor {
040
041    private final PrintWriter out;
042    private final ComponentMonitor delegate;
043
044    public WriterComponentMonitor(Writer out) {
045        this(out, new NullComponentMonitor());
046    }
047
048    public WriterComponentMonitor(Writer out, ComponentMonitor delegate) {
049        this.out = new PrintWriter(out);
050        this.delegate = delegate;
051    }
052
053    public <T> Constructor<T> instantiating(PicoContainer container, ComponentAdapter<T> componentAdapter,
054                                     Constructor<T> constructor) {
055        out.println(format(ComponentMonitorHelper.INSTANTIATING, ctorToString(constructor)));
056        return delegate.instantiating(container, componentAdapter, constructor);
057    }
058
059    public <T> void instantiated(PicoContainer container, ComponentAdapter<T> componentAdapter,
060                             Constructor<T> constructor,
061                             Object instantiated,
062                             Object[] injected,
063                             long duration) {
064        out.println(format(ComponentMonitorHelper.INSTANTIATED, ctorToString(constructor), duration, instantiated.getClass().getName(), parmsToString(injected)));
065        delegate.instantiated(container, componentAdapter, constructor, instantiated, injected, duration);
066    }
067
068    public <T> void instantiationFailed(PicoContainer container,
069                                    ComponentAdapter<T> componentAdapter,
070                                    Constructor<T> constructor,
071                                    Exception cause) {
072        out.println(format(ComponentMonitorHelper.INSTANTIATION_FAILED, ctorToString(constructor), cause.getMessage()));
073        delegate.instantiationFailed(container, null, constructor, cause);
074    }
075
076    public Object invoking(PicoContainer container,
077                           ComponentAdapter<?> componentAdapter,
078                           Member member,
079                           Object instance, Object[] args) {
080        out.println(format(ComponentMonitorHelper.INVOKING, memberToString(member), instance));
081        return delegate.invoking(container, componentAdapter, member, instance, args);
082    }
083
084    public void invoked(PicoContainer container,
085                        ComponentAdapter<?> componentAdapter,
086                        Member member,
087                        Object instance,
088                        long duration, Object[] args, Object retVal) {
089        out.println(format(ComponentMonitorHelper.INVOKED, methodToString(member), instance, duration));
090        delegate.invoked(container, componentAdapter, member, instance, duration, args, retVal);
091    }
092
093    public void invocationFailed(Member member, Object instance, Exception cause) {
094        out.println(format(ComponentMonitorHelper.INVOCATION_FAILED, memberToString(member), instance, cause.getMessage()));
095        delegate.invocationFailed(member, instance, cause);
096    }
097
098    public void lifecycleInvocationFailed(MutablePicoContainer container,
099                                          ComponentAdapter<?> componentAdapter, Method method,
100                                          Object instance,
101                                          RuntimeException cause) {
102        out.println(format(ComponentMonitorHelper.LIFECYCLE_INVOCATION_FAILED, methodToString(method), instance, cause.getMessage()));
103        delegate.lifecycleInvocationFailed(container, componentAdapter, method, instance, cause);
104    }
105
106    public Object noComponentFound(MutablePicoContainer container, Object componentKey) {
107        out.println(format(ComponentMonitorHelper.NO_COMPONENT, componentKey));
108        return delegate.noComponentFound(container, componentKey);
109    }
110
111    public Injector newInjector(Injector injector) {
112        return delegate.newInjector(injector);
113    }
114
115    /** {@inheritDoc} **/
116    public Behavior newBehavior(Behavior behavior) {
117        return delegate.newBehavior(behavior);
118    }
119
120
121}