org.apache.commons.logging.impl
Class SLF4JLogFactory

java.lang.Object
  extended by org.apache.commons.logging.LogFactory
      extended by org.apache.commons.logging.impl.SLF4JLogFactory

public class SLF4JLogFactory
extends LogFactory

Concrete subclass of LogFactory which always delegates to the org.slf4j.LoggerFactory class.

This factory generates instances of SLF4JLog. It will remember previously created instances for the same name, and will return them on repeated requests to the getInstance() method.

This implementation ignores any configured attributes.

Author:
Rod Waldhoff, Craig R. McClanahan, Richard A. Sitze, Ceki Gülcü

Field Summary
protected  Hashtable attributes
          Configuration attributes.
static String LOG_PROPERTY
          The name of the system property identifying our Logimplementation class.
 
Fields inherited from class org.apache.commons.logging.LogFactory
DIAGNOSTICS_DEST_PROPERTY, factories, FACTORY_DEFAULT, FACTORY_PROPERTIES, FACTORY_PROPERTY, HASHTABLE_IMPLEMENTATION_PROPERTY, nullClassLoaderFactory, PRIORITY_KEY, SERVICE_ID, TCCL_KEY
 
Constructor Summary
SLF4JLogFactory()
          Public no-arguments constructor required by the lookup mechanism.
 
Method Summary
 Object getAttribute(String name)
          Return the configuration attribute with the specified name (if any), or null if there is no such attribute.
 String[] getAttributeNames()
          Return an array containing the names of all currently defined configuration attributes.
 Log getInstance(Class clazz)
          Convenience method to derive a name from the specified class and call getInstance(String) with it.
 Log getInstance(String name)
           Construct (if necessary) and return a Log instance, using the factory's current set of configuration attributes.
 void release()
          Release any internal references to previously created Loginstances returned by this factory.
 void removeAttribute(String name)
          Remove any configuration attribute associated with the specified name.
 void setAttribute(String name, Object value)
          Set the configuration attribute with the specified name.
 
Methods inherited from class org.apache.commons.logging.LogFactory
createFactory, directGetContextClassLoader, getClassLoader, getContextClassLoader, getFactory, getLog, getLog, isDiagnosticsEnabled, logRawDiagnostic, newFactory, newFactory, objectId, release, releaseAll
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

LOG_PROPERTY

public static final String LOG_PROPERTY
The name of the system property identifying our Logimplementation class.

See Also:
Constant Field Values

attributes

protected Hashtable attributes
Configuration attributes.

Constructor Detail

SLF4JLogFactory

public SLF4JLogFactory()
Public no-arguments constructor required by the lookup mechanism.

Method Detail

getAttribute

public Object getAttribute(String name)
Return the configuration attribute with the specified name (if any), or null if there is no such attribute.

Specified by:
getAttribute in class LogFactory
Parameters:
name - Name of the attribute to return
Returns:
configuration attribute

getAttributeNames

public String[] getAttributeNames()
Return an array containing the names of all currently defined configuration attributes. If there are no such attributes, a zero length array is returned.

Specified by:
getAttributeNames in class LogFactory
Returns:
names of all currently defined configuration attributes

getInstance

public Log getInstance(Class clazz)
                throws LogConfigurationException
Convenience method to derive a name from the specified class and call getInstance(String) with it.

Specified by:
getInstance in class LogFactory
Parameters:
clazz - Class for which a suitable Log name will be derived
Throws:
LogConfigurationException - if a suitable Log instance cannot be returned

getInstance

public Log getInstance(String name)
                throws LogConfigurationException

Construct (if necessary) and return a Log instance, using the factory's current set of configuration attributes.

Specified by:
getInstance in class LogFactory
Parameters:
name - Logical name of the Log instance to be returned (the meaning of this name is only known to the underlying logging implementation that is being wrapped)
Throws:
LogConfigurationException - if a suitable Log instance cannot be returned

release

public void release()
Release any internal references to previously created Loginstances returned by this factory. This is useful in environments like servlet containers, which implement application reloading by throwing away a ClassLoader. Dangling references to objects in that class loader would prevent garbage collection.

Specified by:
release in class LogFactory

removeAttribute

public void removeAttribute(String name)
Remove any configuration attribute associated with the specified name. If there is no such attribute, no action is taken.

Specified by:
removeAttribute in class LogFactory
Parameters:
name - Name of the attribute to remove

setAttribute

public void setAttribute(String name,
                         Object value)
Set the configuration attribute with the specified name. Calling this with a null value is equivalent to calling removeAttribute(name).

Specified by:
setAttribute in class LogFactory
Parameters:
name - Name of the attribute to set
value - Value of the attribute to set, or null to remove any setting for this attribute


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