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## org.picocontainer.gems.monitors
Class Log4JComponentMonitor

    java.lang.Object
      org.picocontainer.gems.monitors.Log4JComponentMonitor

All Implemented Interfaces:
  Serializable, org.picocontainer.ComponentMonitor

    public class Log4JComponentMonitor

extends Object
implements org.picocontainer.ComponentMonitor, Serializable

A `ComponentMonitor` which writes to a Log4J `Logger` instance. The Logger instance can either be injected or, if not set, the `LogManager` will be used to retrieve it at every invocation of the monitor.

Author:
  Paul Hammant, Mauro Talevi
See Also:
  Serialized Form

Field Summary

Fields inherited from interface org.picocontainer.ComponentMonitor
`KEEP`

Constructor Summary
`Log4JComponentMonitor()` Creates a Log4JComponentMonitor with no Logger instance set.
`Log4JComponentMonitor(Class<?> loggerClass)` Creates a Log4JComponentMonitor with a given Logger instance class.
`Log4JComponentMonitor(Class<?> loggerClass, org.picocontainer.ComponentMonitor delegate)` Creates a Log4JComponentMonitor with a given Logger instance class.
`Log4JComponentMonitor(org.picocontainer.ComponentMonitor delegate)`
`Log4JComponentMonitor(org.apache.log4j.Logger logger)` Creates a Log4JComponentMonitor with a given Logger instance
`Log4JComponentMonitor(org.apache.log4j.Logger logger, org.picocontainer.ComponentMonitor delegate)` Creates a Log4JComponentMonitor with a given Logger instance
`Log4JComponentMonitor(String loggerName)` Creates a Log4JComponentMonitor with a given Logger instance name.
`Log4JComponentMonitor(String loggerName, org.picocontainer.ComponentMonitor delegate)` Creates a Log4JComponentMonitor with a given Logger instance name.

Method Summary
`protected org.apache.log4j.Logger` | `getLogger(Member member)`
`
`<T> void`
` | `instantiated(org.picocontainer.PicoContainer container, org.picocontainer.ComponentAdapter<T> componentAdapter, Constructor<T> constructor, Object instantiated, Object[] parameters, long duration)`
`
`<T> Constructor<T>`
` | `instantiating(org.picocontainer.PicoContainer container, org.picocontainer.ComponentAdapter<T> componentAdapter, Constructor<T> constructor)`
`
`<T> void`
` | `instantiationFailed(org.picocontainer.PicoContainer container, org.picocontainer.ComponentAdapter<T> componentAdapter, Constructor<T> constructor, Exception cause)`
`void` | `invocationFailed(Member member, Object instance, Exception cause)`
`void` | `invoked(org.picocontainer.PicoContainer container, org.picocontainer.ComponentAdapter<?> componentAdapter, Member member, Object instance, long duration, Object[] args, Object retVal)`
`Object` | `invoking(org.picocontainer.PicoContainer container, org.picocontainer.ComponentAdapter<?> componentAdapter, Member member, Object instance, Object[] args)`
`void` | `lifecycleInvocationFailed(org.picocontainer.MutablePicoContainer container, org.picocontainer.ComponentAdapter<?> componentAdapter, Method method, Object instance, RuntimeException cause)`
`org.picocontainer.Behavior` | `newBehavior(org.picocontainer.Behavior behavior)`
`org.picocontainer.Injector` | `newInjector(org.picocontainer.Injector injector)`
`Object` | `noComponentFound(org.picocontainer.MutablePicoContainer container, Object componentKey)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Log4JComponentMonitor

    public Log4JComponentMonitor()

  Creates a Log4JComponentMonitor with no Logger instance set. The `LogManager` will be used to retrieve the Logger instance at every invocation of the monitor.

### Log4JComponentMonitor

    public Log4JComponentMonitor(Class<?> loggerClass)

  Creates a Log4JComponentMonitor with a given Logger instance class. The class name is used to retrieve the Logger instance.

  Parameters:
    `loggerClass` - the class of the Logger

### Log4JComponentMonitor

    public Log4JComponentMonitor(String loggerName)

  Creates a Log4JComponentMonitor with a given Logger instance name. It uses the `LogManager` to create the Logger instance.

  Parameters:
    `loggerName` - the name of the Log

### Log4JComponentMonitor

    public Log4JComponentMonitor(org.apache.log4j.Logger logger)

  Creates a Log4JComponentMonitor with a given Logger instance

  Parameters:
    `logger` - the Logger to write to

### Log4JComponentMonitor

    public Log4JComponentMonitor(Class<?> loggerClass,
                                 org.picocontainer.ComponentMonitor delegate)

  Creates a Log4JComponentMonitor with a given Logger instance class. The class name is used to retrieve the Logger instance.

  Parameters:
    `loggerClass` - the class of the Logger
    `delegate` - the delegate

### Log4JComponentMonitor

    public Log4JComponentMonitor(String loggerName,
                                 org.picocontainer.ComponentMonitor delegate)

  Creates a Log4JComponentMonitor with a given Logger instance name. It uses the `LogManager` to create the Logger instance.

  Parameters:
    `loggerName` - the name of the Log
    `delegate` - the delegate

### Log4JComponentMonitor

    public Log4JComponentMonitor(org.apache.log4j.Logger logger,
                                 org.picocontainer.ComponentMonitor delegate)

  Creates a Log4JComponentMonitor with a given Logger instance

  Parameters:
    `logger` - the Logger to write to
    `delegate` - the delegate

### Log4JComponentMonitor

    public Log4JComponentMonitor(org.picocontainer.ComponentMonitor delegate)

Method Detail

### instantiating

    public <T> Constructor<T> instantiating(org.picocontainer.PicoContainer container,
                                            org.picocontainer.ComponentAdapter<T> componentAdapter,
                                            Constructor<T> constructor)

  Specified by:
    `instantiating` in interface `org.picocontainer.ComponentMonitor`

### instantiated

    public <T> void instantiated(org.picocontainer.PicoContainer container,
                                 org.picocontainer.ComponentAdapter<T> componentAdapter,
                                 Constructor<T> constructor,
                                 Object instantiated,
                                 Object[] parameters,
                                 long duration)

  Specified by:
    `instantiated` in interface `org.picocontainer.ComponentMonitor`

### instantiationFailed

    public <T> void instantiationFailed(org.picocontainer.PicoContainer container,
                                        org.picocontainer.ComponentAdapter<T> componentAdapter,
                                        Constructor<T> constructor,
                                        Exception cause)

  Specified by:
    `instantiationFailed` in interface `org.picocontainer.ComponentMonitor`

### invoking

    public Object invoking(org.picocontainer.PicoContainer container,
                           org.picocontainer.ComponentAdapter<?> componentAdapter,
                           Member member,
                           Object instance,
                           Object[] args)

  Specified by:
    `invoking` in interface `org.picocontainer.ComponentMonitor`

### invoked

    public void invoked(org.picocontainer.PicoContainer container,
                        org.picocontainer.ComponentAdapter<?> componentAdapter,
                        Member member,
                        Object instance,
                        long duration,
                        Object[] args,
                        Object retVal)

  Specified by:
    `invoked` in interface `org.picocontainer.ComponentMonitor`

### invocationFailed

    public void invocationFailed(Member member,
                                 Object instance,
                                 Exception cause)

  Specified by:
    `invocationFailed` in interface `org.picocontainer.ComponentMonitor`

### lifecycleInvocationFailed

    public void lifecycleInvocationFailed(org.picocontainer.MutablePicoContainer container,
                                          org.picocontainer.ComponentAdapter<?> componentAdapter,
                                          Method method,
                                          Object instance,
                                          RuntimeException cause)

  Specified by:
    `lifecycleInvocationFailed` in interface `org.picocontainer.ComponentMonitor`

### noComponentFound

    public Object noComponentFound(org.picocontainer.MutablePicoContainer container,
                                   Object componentKey)

  Specified by:
    `noComponentFound` in interface `org.picocontainer.ComponentMonitor`

### newInjector

    public org.picocontainer.Injector newInjector(org.picocontainer.Injector injector)

  Specified by:
    `newInjector` in interface `org.picocontainer.ComponentMonitor`

### newBehavior

    public org.picocontainer.Behavior newBehavior(org.picocontainer.Behavior behavior)

  Specified by:
    `newBehavior` in interface `org.picocontainer.ComponentMonitor`

### getLogger

    protected org.apache.log4j.Logger getLogger(Member member)

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