Log4j Version 1.2.14: Class JMSAppender

org.apache.log4j.net Class JMSAppender

java.lang.Object
  |
  +--org.apache.log4j.AppenderSkeleton
        |
        +--org.apache.log4j.net.JMSAppender

All Implemented Interfaces:

Appender, OptionHandler

public class JMSAppender

extends AppenderSkeleton

A simple appender that publishes events to a JMS Topic. The events are serialized and transmitted as JMS message type ObjectMessage.

JMS topics and topic connection factories are administered objects that are retrieved using JNDI messaging which in turn requires the retreival of a JNDI Context.

There are two common methods for retrieving a JNDI Context. If a file resource named jndi.properties is available to the JNDI API, it will use the information found therein to retrieve an initial JNDI context. To obtain an initial context, your code will simply call:

InitialContext jndiContext = new InitialContext();

Calling the no-argument InitialContext() method will also work from within Enterprise Java Beans (EJBs) because it is part of the EJB contract for application servers to provide each bean an environment naming context (ENC).

In the second approach, several predetermined properties are set and these properties are passed to the InitialContext contructor to connect to the naming service provider. For example, to connect to JBoss naming service one would write:

Properties env = new Properties( );
env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
env.put(Context.PROVIDER_URL, "jnp://hostname:1099");
env.put(Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces");
InitialContext jndiContext = new InitialContext(env);

To connect to the the naming service of Weblogic application server one would write:

Properties env = new Properties( );
env.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
env.put(Context.PROVIDER_URL, "t3://localhost:7001");
InitialContext jndiContext = new InitialContext(env);

Other JMS providers will obviously require different values. The initial JNDI context can be obtained by calling the no-argument InitialContext() method in EJBs. Only clients running in a separate JVM need to be concerned about the jndi.properties file and calling InitialContext.InitialContext() or alternatively correctly setting the different properties before calling InitialContext.InitialContext(java.util.Hashtable) method.

Author:

Ceki Gülcü

JMSAppender

public JMSAppender()

setTopicConnectionFactoryBindingName

public void setTopicConnectionFactoryBindingName(String tcfBindingName)

The TopicConnectionFactoryBindingName option takes a string value. Its value will be used to lookup the appropriate TopicConnectionFactory from the JNDI context.

getTopicConnectionFactoryBindingName

public String getTopicConnectionFactoryBindingName()

Returns the value of the TopicConnectionFactoryBindingName option.

setTopicBindingName

public void setTopicBindingName(String topicBindingName)

The TopicBindingName option takes a string value. Its value will be used to lookup the appropriate Topic from the JNDI context.

getTopicBindingName

public String getTopicBindingName()

Returns the value of the TopicBindingName option.

getLocationInfo

public boolean getLocationInfo()

Returns value of the LocationInfo property which determines whether location (stack) info is sent to the remote subscriber.

activateOptions

public void activateOptions()

Options are activated and become effective only after calling this method.

Overrides:

activateOptions in class AppenderSkeleton

lookup

protected Object lookup(Context ctx,
                        String name)
                 throws NamingException

checkEntryConditions

protected boolean checkEntryConditions()

close

public void close()

Close this JMSAppender. Closing releases all resources used by the appender. A closed appender cannot be re-opened.

append

public void append(LoggingEvent event)

This method called by AppenderSkeleton.doAppend(org.apache.log4j.spi.LoggingEvent) method to do most of the real appending work.

Overrides:

append in class AppenderSkeleton

getInitialContextFactoryName

public String getInitialContextFactoryName()

Returns the value of the InitialContextFactoryName option. See setInitialContextFactoryName(java.lang.String) for more details on the meaning of this option.

setInitialContextFactoryName

public void setInitialContextFactoryName(String initialContextFactoryName)

Setting the InitialContextFactoryName method will cause this JMSAppender instance to use the InitialContext.InitialContext(Hashtable) method instead of the no-argument constructor. If you set this option, you should also at least set the ProviderURL option.

See also setProviderURL(String).

getProviderURL

public String getProviderURL()

setProviderURL

public void setProviderURL(String providerURL)

setURLPkgPrefixes

public void setURLPkgPrefixes(String urlPkgPrefixes)

getSecurityCredentials

public String getSecurityCredentials()

setSecurityCredentials

public void setSecurityCredentials(String securityCredentials)

getSecurityPrincipalName

public String getSecurityPrincipalName()

setSecurityPrincipalName

public void setSecurityPrincipalName(String securityPrincipalName)

getUserName

public String getUserName()

setUserName

public void setUserName(String userName)

The user name to use when creating a topic session. If you set this option, you should also set the Password option. See setPassword(String).

getPassword

public String getPassword()

setPassword

public void setPassword(String password)

The paswword to use when creating a topic session.

setLocationInfo

public void setLocationInfo(boolean locationInfo)

If true, the information sent to the remote subscriber will include caller's location information. By default no location information is sent to the subscriber.

getTopicConnection

protected TopicConnection getTopicConnection()

Returns the TopicConnection used for this appender. Only valid after activateOptions() method has been invoked.

getTopicSession

protected TopicSession getTopicSession()

Returns the TopicSession used for this appender. Only valid after activateOptions() method has been invoked.

getTopicPublisher

protected TopicPublisher getTopicPublisher()

Returns the TopicPublisher used for this appender. Only valid after activateOptions() method has been invoked.

requiresLayout

public boolean requiresLayout()

The JMSAppender sends serialized events and consequently does not require a layout.