org.apache.cassandra.service
Class AbstractCassandraDaemon

java.lang.Object
  org.apache.cassandra.service.AbstractCassandraDaemon

All Implemented Interfaces:

CassandraDaemon

Direct Known Subclasses:

CassandraDaemon

public abstract class AbstractCassandraDaemon
extends java.lang.Object
implements CassandraDaemon

The CassandraDaemon is an abstraction for a Cassandra daemon service, which defines not only a way to activate and deactivate it, but also hooks into its lifecycle methods (see setup(), start(), stop() and setup()).

Nested Class Summary

static class

AbstractCassandraDaemon.CleaningThreadPool A subclass of Java's ThreadPoolExecutor which implements Jetty's ThreadPool interface (for integration with Avro), and performs ClientState cleanup.

Field Summary

protected boolean	isRunning
protected java.net.InetAddress	listenAddr
protected int	listenPort

Constructor Summary

AbstractCassandraDaemon()

Method Summary

void	activate() A convenience method to initialize and start the daemon in one shot.
void	deactivate() A convenience method to stop and destroy the daemon in one shot.
void	destroy() Clean up all resources obtained during the lifetime of the daemon.
void	init(java.lang.String[] arguments) Initialize the Cassandra Daemon based on the given Commons Daemon-specific arguments.
boolean	isRPCServerRunning() Returns whether the underlying RPC server is running or not.
protected void	setup() This is a hook for concrete daemons to initialize themselves suitably.
void	start() Start the Cassandra Daemon, assuming that it has already been initialized via init(String[]) Hook for JSVC
void	startRPCServer() Start the underlying RPC server in idempotent manner.
protected abstract void	startServer() Start the underlying RPC server.
void	stop() Stop the daemon, ideally in an idempotent manner.
void	stopRPCServer() Stop the underlying RPC server in idempotent manner.
protected abstract void	stopServer() Stop the underlying RPC server.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

listenAddr

protected java.net.InetAddress listenAddr

listenPort

protected int listenPort

isRunning

protected volatile boolean isRunning

Constructor Detail

AbstractCassandraDaemon

public AbstractCassandraDaemon()

Method Detail

setup

protected void setup()
              throws java.io.IOException

This is a hook for concrete daemons to initialize themselves suitably. Subclasses should override this to finish the job (listening on ports, etc.)

Throws:

java.io.IOException

init

public void init(java.lang.String[] arguments)
          throws java.io.IOException

Initialize the Cassandra Daemon based on the given Commons Daemon-specific arguments. To clarify, this is a hook for JSVC.

Specified by:

init in interface CassandraDaemon

Parameters:

arguments - the arguments passed in from JSVC

Throws:

java.io.IOException

start

public void start()

Start the Cassandra Daemon, assuming that it has already been initialized via init(String[]) Hook for JSVC

Specified by:

start in interface CassandraDaemon

Throws:

java.io.IOException

stop

public void stop()

Stop the daemon, ideally in an idempotent manner. Hook for JSVC

Specified by:

stop in interface CassandraDaemon

startRPCServer

public void startRPCServer()

Start the underlying RPC server in idempotent manner.

Specified by:

startRPCServer in interface CassandraDaemon

stopRPCServer

public void stopRPCServer()

Stop the underlying RPC server in idempotent manner.

Specified by:

stopRPCServer in interface CassandraDaemon

isRPCServerRunning

public boolean isRPCServerRunning()

Returns whether the underlying RPC server is running or not.

Specified by:

isRPCServerRunning in interface CassandraDaemon

startServer

protected abstract void startServer()

Start the underlying RPC server. This method shoud be able to restart a server stopped through stopServer(). Should throw a RuntimeException if the server cannot be started

stopServer

protected abstract void stopServer()

Stop the underlying RPC server. This method should be able to stop server started through startServer(). Should throw a RuntimeException if the server cannot be stopped

destroy

public void destroy()

Clean up all resources obtained during the lifetime of the daemon. This is a hook for JSVC.

Specified by:

destroy in interface CassandraDaemon

activate

public void activate()

A convenience method to initialize and start the daemon in one shot.

Specified by:

activate in interface CassandraDaemon

deactivate

public void deactivate()

A convenience method to stop and destroy the daemon in one shot.

Specified by:

deactivate in interface CassandraDaemon