org.apache.commons.logging.LogFactory
org.apache.commons.logging.impl.LogFactoryImpl
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java.lang.Object
Concrete subclass of LogFactory that implements the
following algorithm to dynamically select a logging implementation
class to instantiate a wrapper for.
org.apache.commons.logging.Log to identify the
requested implementation class.org.apache.commons.logging.Log system property
to identify the requested implementation class.org.apache.commons.logging.impl.Log4JLogger.org.apache.commons.logging.impl.Jdk14Logger.org.apache.commons.logging.impl.SimpleLog.If the selected Log implementation class has a
setLogFactory() method that accepts a LogFactory
parameter, this method will be called on each newly created instance
to identify the associated factory. This makes factory configuration
attributes available to the Log instance, if it so desires.
This factory will remember previously created Log instances
for the same name, and will return them on repeated requests to the
getInstance() method. This implementation ignores any
configured attributes.
| Field Summary | |
protected Hashtable |
attributes
Configuration attributes |
protected Hashtable |
instances
The Log instances that have
already been created, keyed by logger name. |
static String |
LOG_PROPERTY
The name of the system property identifying our Log
implementation class. |
protected static String |
LOG_PROPERTY_OLD
The deprecated system property used for backwards compatibility with the old LogSource class. |
protected Constructor |
logConstructor
The one-argument constructor of the Log
implementation class that will be used to create new instances.
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protected Class[] |
logConstructorSignature
The signature of the Constructor to be used. |
protected Method |
logMethod
The one-argument setLogFactory method of the selected
Log method, if it exists. |
protected Class[] |
logMethodSignature
The signature of the setLogFactory method to be used. |
| Fields inherited from class org.apache.commons.logging.LogFactory |
factories, FACTORY_DEFAULT, FACTORY_PROPERTIES, FACTORY_PROPERTY, SERVICE_ID |
| Constructor Summary | |
LogFactoryImpl()
Public no-arguments constructor required by the lookup mechanism. |
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| 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. |
protected String |
getLogClassName()
Return the fully qualified Java classname of the Log
implementation we will be using. |
protected Constructor |
getLogConstructor()
Return the Constructor that can be called to instantiate
new Log instances. |
protected boolean |
isJdk14Available()
Is JDK 1.4 or later logging available? |
protected boolean |
isLog4JAvailable()
Is a Log4J implementation available? |
protected Log |
newInstance(String name)
Create and return a new Log
instance for the specified name. |
void |
release()
Release any internal references to previously created Log
instances 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 |
getContextClassLoader, getFactory, getLog, getLog, newFactory, release, releaseAll |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
public static final String LOG_PROPERTY
Log
implementation class.
protected static final String LOG_PROPERTY_OLD
LogSource class.
protected Hashtable attributes
protected Hashtable instances
Log instances that have
already been created, keyed by logger name.
protected Constructor logConstructor
Log
implementation class that will be used to create new instances.
This value is initialized by getLogConstructor(),
and then returned repeatedly.
protected Class[] logConstructorSignature
protected Method logMethod
setLogFactory method of the selected
Log method, if it exists.
protected Class[] logMethodSignature
setLogFactory method to be used.
| Constructor Detail |
public LogFactoryImpl()
| Method Detail |
public Object getAttribute(String name)
null if there is no such attribute.
getAttribute in class LogFactoryname - Name of the attribute to returnpublic String[] getAttributeNames()
getAttributeNames in class LogFactory
public Log getInstance(Class clazz)
throws LogConfigurationException
getInstance(String) with it.
getInstance in class LogFactoryclazz - Class for which a suitable Log name will be derived
LogConfigurationException - if a suitable Log
instance cannot be returned
public Log getInstance(String name)
throws LogConfigurationException
Construct (if necessary) and return a Log instance,
using the factory's current set of configuration attributes.
NOTE - Depending upon the implementation of
the LogFactory you are using, the Log
instance you are returned may or may not be local to the current
application, and may or may not be returned again on a subsequent
call with the same name argument.
getInstance in class LogFactoryname - 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)
LogConfigurationException - if a suitable Log
instance cannot be returnedpublic void release()
Log
instances returned by this factory. This is useful 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.
release in class LogFactorypublic void removeAttribute(String name)
removeAttribute in class LogFactoryname - Name of the attribute to remove
public void setAttribute(String name,
Object value)
null value is equivalent to calling
removeAttribute(name).
setAttribute in class LogFactoryname - Name of the attribute to setvalue - Value of the attribute to set, or null
to remove any setting for this attributeprotected String getLogClassName()
Log
implementation we will be using.
protected Constructor getLogConstructor()
throws LogConfigurationException
Return the Constructor that can be called to instantiate
new Log instances.
IMPLEMENTATION NOTE - Race conditions caused by
calling this method from more than one thread are ignored, because
the same Constructor instance will ultimately be derived
in all circumstances.
LogConfigurationException - if a suitable constructor
cannot be returnedprotected boolean isJdk14Available()
protected boolean isLog4JAvailable()
protected Log newInstance(String name)
throws LogConfigurationException
Log
instance for the specified name.
name - Name of the new logger
LogConfigurationException - if a new instance cannot
be created
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