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Java Source Code / Java Documentation » Library » Apache common Daemon » org.apache.commons.daemon

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.commons.daemon .Daemon

All known Subclasses:   org.apache.commons.daemon .SimpleDaemon,
Daemon
public interface Daemon (Code)
This interface provides support for native daemon invocation. Using a platform dependant helper program classes that implement the Daemon interface can be initialized, started and stopped according to the convensions of the underlying operating system.
Implementors of this interface must also provide a public constructor with no arguments so that instances can be created in an automated fashion.

author:
   Pier Fumagalli
author:
   Copyright © 2000-2001 The
author:
   Apache Software Foundation. All rights reserved.
version:
   1.0 (CVS $Revision: 155409 $)

Method Summary
public void destroy()
     Free any resources allocated by this daemon such as file descriptors or sockets.
public void init(DaemonContext context)
     Initialize this Daemon instance.
This method gets called once the JVM process is created and the Daemon instance is created thru its empty public constructor.

Under certain operating systems (typically Unix based operating systems) and if the native invocation framework is configured to do so, this method might be called with super-user privileges.

For example, it might be wise to create ServerSocket instances within the scope of this method, and perform all operations requiring super-user privileges in the underlying operating system.

Apart from set up and allocation of native resources, this method must not start the actual operation of the Daemon (such as starting threads calling the ServerSocket.accept() method) as this would impose some serious security hazards.
public void start()
     Start the operation of this Daemon instance.
public void stop()
     Stop the operation of this Daemon instance.

Method Detail
destroy
public void destroy()(Code)
Free any resources allocated by this daemon such as file descriptors or sockets. This method gets called by the container after stop() has been called, before the JVM exits. The Daemon can not be restarted after this method has been called without a new call to the init() method.

init
public void init(DaemonContext context) throws Exception(Code)
Initialize this Daemon instance.
This method gets called once the JVM process is created and the Daemon instance is created thru its empty public constructor.

Under certain operating systems (typically Unix based operating systems) and if the native invocation framework is configured to do so, this method might be called with super-user privileges.

For example, it might be wise to create ServerSocket instances within the scope of this method, and perform all operations requiring super-user privileges in the underlying operating system.

Apart from set up and allocation of native resources, this method must not start the actual operation of the Daemon (such as starting threads calling the ServerSocket.accept() method) as this would impose some serious security hazards. The start of operation must be performed in the start() method.

Parameters:
  context - A DaemonContext object used tocommunicate with the container.
exception:
  Exception - Any exception preventing a successfulinitialization.

start
public void start() throws Exception(Code)
Start the operation of this Daemon instance. This method is to be invoked by the environment after the init() method has been successfully invoked and possibly the security level of the JVM has been dropped. Implementors of this method are free to start any number of threads, but need to return control avfter having done that to enable invocation of the stop()-method.

stop
public void stop() throws Exception(Code)
Stop the operation of this Daemon instance. Note that the proper place to free any allocated resources such as sockets or file descriptors is in the destroy method, as the container may restart the Daemon by calling start() after stop().

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