org.apache.catalina.ha.deploy
Class FarmWarDeployer

java.lang.Object
  org.apache.catalina.ha.ClusterListener
      org.apache.catalina.ha.deploy.FarmWarDeployer

All Implemented Interfaces:

ClusterDeployer, FileChangeListener, ChannelListener

public class FarmWarDeployer
extends ClusterListener
implements ClusterDeployer, FileChangeListener

A farm war deployer is a class that is able to deploy/undeploy web applications in WAR from within the cluster.

Any host can act as the admin, and will have three directories

• deployDir - the directory where we watch for changes
• applicationDir - the directory where we install applications
• tempDir - a temporaryDirectory to store binary data when downloading a war from the cluster

Currently we only support deployment of WAR files since they are easier to send across the wire.

Version:

$Revision: 1064881 $

Author:

Filip Hanik, Peter Rossbach

Field Summary

protected File	appBase The host appBase.
protected File	configBase Path where context descriptors should be deployed.
protected String	deployDir
protected HashMap<String,FileMessageFactory>	fileFactories
protected Host	host The associated host.
protected MBeanServer	mBeanServer MBean server.
protected ObjectName	oname The associated deployer ObjectName.
protected int	processDeployFrequency Frequency of the Farm watchDir check.
protected boolean	started
protected String	tempDir
protected String	watchDir
protected boolean	watchEnabled
protected WarWatcher	watcher

Fields inherited from class org.apache.catalina.ha.ClusterListener

cluster

Constructor Summary

FarmWarDeployer()

Method Summary

boolean	accept(ClusterMessage msg) Before the cluster invokes messageReceived the cluster will ask the receiver to accept or decline the message, In the future, when messages get big, the accept method will only take a message header
protected void	addServiced(String name) Invoke the check method on the deployer.
void	backgroundProcess() call from container Background Process
protected void	check(String name) Invoke the check method on the deployer.
void	cleanDeployDir()
protected boolean	copy(File from, File to) Copy a file to the specified temp directory.
boolean	equals(Object listener)
void	fileModified(File newWar)
void	fileRemoved(File removeWar)
protected File	getAppBase() Return a File object representing the "application root" directory for our associated Host.
String	getDeployDir()
FileMessageFactory	getFactory(FileMessage msg) create factory for all transported war files
String	getInfo() Return descriptive information about this deployer implementation and the corresponding version number, in the format <description>/<version>.
int	getProcessDeployFrequency() Return the frequency of watcher checks.
String	getTempDir()
String	getWatchDir()
boolean	getWatchEnabled()
int	hashCode()
void	install(String contextName, File webapp) Install a new web application, whose web application archive is at the specified URL, into this container and all the other members of the cluster with the specified context name.
protected boolean	isServiced(String name) Invoke the check method on the deployer.
boolean	isWatchEnabled()
void	messageReceived(ClusterMessage msg) Callback from the cluster, when a message is received, The cluster will broadcast it invoking the messageReceived on the receiver.
protected void	remove(String contextName) Invoke the remove method on the deployer.
void	remove(String contextName, boolean undeploy) Remove an existing web application, attached to the specified context name.
void	removeFactory(FileMessage msg) Remove file (war) from messages)
protected void	removeServiced(String name) Invoke the check method on the deployer.
void	setDeployDir(String deployDir)
void	setProcessDeployFrequency(int processExpiresFrequency) Set the watcher checks frequency.
void	setTempDir(String tempDir)
void	setWatchDir(String watchDir)
void	setWatchEnabled(boolean watchEnabled)
void	start() Start the cluster deployer, the owning container will invoke this
void	stop() Stops the cluster deployer, the owning container will invoke this
protected void	undeployDir(File dir) Delete the specified directory, including all of its contents and subdirectories recursively.

Methods inherited from class org.apache.catalina.ha.ClusterListener

accept, getCluster, messageReceived, setCluster

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.catalina.ha.ClusterDeployer

getCluster, setCluster

Methods inherited from interface org.apache.catalina.tribes.ChannelListener

accept, messageReceived

Field Detail

started

protected boolean started

fileFactories

protected HashMap<String,FileMessageFactory> fileFactories

deployDir

protected String deployDir

tempDir

protected String tempDir

watchDir

protected String watchDir

watchEnabled

protected boolean watchEnabled

watcher

protected WarWatcher watcher

processDeployFrequency

protected int processDeployFrequency

Frequency of the Farm watchDir check. Cluster wide deployment will be done once for the specified amount of backgrondProcess calls (ie, the lower the amount, the most often the checks will occur).

configBase

protected File configBase

Path where context descriptors should be deployed.

host

protected Host host

The associated host.

appBase

protected File appBase

The host appBase.

mBeanServer

protected MBeanServer mBeanServer

MBean server.

oname

protected ObjectName oname

The associated deployer ObjectName.

Constructor Detail

FarmWarDeployer

public FarmWarDeployer()

Method Detail

getInfo

public String getInfo()

Return descriptive information about this deployer implementation and the corresponding version number, in the format <description>/<version>.

start

public void start()
           throws Exception

Description copied from interface: ClusterDeployer

Start the cluster deployer, the owning container will invoke this

Specified by:

start in interface ClusterDeployer

Throws:

Exception - - if failure to start cluster

stop

public void stop()
          throws LifecycleException

Description copied from interface: ClusterDeployer

Stops the cluster deployer, the owning container will invoke this

Specified by:

stop in interface ClusterDeployer

Throws:

LifecycleException

cleanDeployDir

public void cleanDeployDir()

messageReceived

public void messageReceived(ClusterMessage msg)

Callback from the cluster, when a message is received, The cluster will broadcast it invoking the messageReceived on the receiver.

Specified by:

messageReceived in class ClusterListener

Parameters:

msg - ClusterMessage - the message received from the cluster

getFactory

public FileMessageFactory getFactory(FileMessage msg)
                              throws FileNotFoundException,
                                     IOException

create factory for all transported war files

Parameters:

msg -

Returns:

Factory for all app message (war files)

Throws:

FileNotFoundException

IOException

removeFactory

public void removeFactory(FileMessage msg)

Remove file (war) from messages)

Parameters:

msg -

accept

public boolean accept(ClusterMessage msg)

Before the cluster invokes messageReceived the cluster will ask the receiver to accept or decline the message, In the future, when messages get big, the accept method will only take a message header

Specified by:

accept in class ClusterListener

Parameters:

msg - ClusterMessage

Returns:

boolean - returns true to indicate that messageReceived should be invoked. If false is returned, the messageReceived method will not be invoked.

install

public void install(String contextName,
                    File webapp)
             throws IOException

Install a new web application, whose web application archive is at the specified URL, into this container and all the other members of the cluster with the specified context name.

If this application is successfully installed locally, a ContainerEvent of type INSTALL_EVENT will be sent to all registered listeners, with the newly created Context as an argument.

Specified by:

install in interface ClusterDeployer

Parameters:

contextName - The context name to which this application should be installed (must be unique)

webapp - A WAR file or unpacked directory structure containing the web application to be installed

Throws:

IllegalArgumentException - if the specified context name is malformed

IllegalStateException - if the specified context name is already deployed

IOException - if an input/output error was encountered during installation

remove

public void remove(String contextName,
                   boolean undeploy)
            throws IOException

Remove an existing web application, attached to the specified context name. If this application is successfully removed, a ContainerEvent of type REMOVE_EVENT will be sent to all registered listeners, with the removed Context as an argument. Deletes the web application war file and/or directory if they exist in the Host's appBase.

Specified by:

remove in interface ClusterDeployer

Parameters:

contextName - The context name of the application to be removed

undeploy - boolean flag to remove web application from server

Throws:

IllegalArgumentException - if the specified context name is malformed

IllegalArgumentException - if the specified context name does not identify a currently installed web application

IOException - if an input/output error occurs during removal

fileModified

public void fileModified(File newWar)

Specified by:

fileModified in interface FileChangeListener

fileRemoved

public void fileRemoved(File removeWar)

Specified by:

fileRemoved in interface FileChangeListener

getAppBase

protected File getAppBase()

Return a File object representing the "application root" directory for our associated Host.

remove

protected void remove(String contextName)
               throws Exception

Invoke the remove method on the deployer.

Throws:

Exception

undeployDir

protected void undeployDir(File dir)

Delete the specified directory, including all of its contents and subdirectories recursively.

Parameters:

dir - File object representing the directory to be deleted

backgroundProcess

public void backgroundProcess()

Description copied from interface: ClusterDeployer

call from container Background Process

Specified by:

backgroundProcess in interface ClusterDeployer

check

protected void check(String name)
              throws Exception

Invoke the check method on the deployer.

Throws:

Exception

isServiced

protected boolean isServiced(String name)
                      throws Exception

Invoke the check method on the deployer.

Throws:

Exception

addServiced

protected void addServiced(String name)
                    throws Exception

Invoke the check method on the deployer.

Throws:

Exception

removeServiced

protected void removeServiced(String name)
                       throws Exception

Invoke the check method on the deployer.

Throws:

Exception

equals

public boolean equals(Object listener)

Specified by:

equals in interface ChannelListener

Overrides:

equals in class ClusterListener

Parameters:

listener - Object

Returns:

boolean

See Also:

Object.equals(Object)

hashCode

public int hashCode()

Specified by:

hashCode in interface ChannelListener

Overrides:

hashCode in class ClusterListener

Returns:

int

See Also:

Object.hashCode()

getDeployDir

public String getDeployDir()

setDeployDir

public void setDeployDir(String deployDir)

getTempDir

public String getTempDir()

setTempDir

public void setTempDir(String tempDir)

getWatchDir

public String getWatchDir()

setWatchDir

public void setWatchDir(String watchDir)

isWatchEnabled

public boolean isWatchEnabled()

getWatchEnabled

public boolean getWatchEnabled()

setWatchEnabled

public void setWatchEnabled(boolean watchEnabled)

getProcessDeployFrequency

public int getProcessDeployFrequency()

Return the frequency of watcher checks.

setProcessDeployFrequency

public void setProcessDeployFrequency(int processExpiresFrequency)

Set the watcher checks frequency.

Parameters:

processExpiresFrequency - the new manager checks frequency

copy

protected boolean copy(File from,
                       File to)

Copy a file to the specified temp directory.

Parameters:

from - copy from temp

to - to host appBase directory

Returns:

true, copy successful