Tomcat example source code file (FarmWarDeployer.java)
The Tomcat FarmWarDeployer.java source code/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.ha.deploy;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import org.apache.catalina.Container;
import org.apache.catalina.Context;
import org.apache.catalina.Engine;
import org.apache.catalina.Host;
import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.ha.CatalinaCluster;
import org.apache.catalina.ha.ClusterDeployer;
import org.apache.catalina.ha.ClusterListener;
import org.apache.catalina.ha.ClusterMessage;
import org.apache.catalina.tribes.Member;
import org.apache.tomcat.util.modeler.Registry;
/**
* <p>
* A farm war deployer is a class that is able to deploy/undeploy web
* applications in WAR form within the cluster.
* </p>
* Any host can act as the admin, and will have three directories
* <ul>
* <li>deployDir - the directory where we watch for changes
* <li>applicationDir - the directory where we install applications
* <li>tempDir - a temporaryDirectory to store binary data when downloading a
* war from the cluster</li>
* </ul>
* Currently we only support deployment of WAR files since they are easier to
* send across the wire.
*
* @author Filip Hanik
* @author Peter Rossbach
* @version $Revision: 613809 $
*/
public class FarmWarDeployer extends ClusterListener implements ClusterDeployer, FileChangeListener {
/*--Static Variables----------------------------------------*/
public static org.apache.juli.logging.Log log = org.apache.juli.logging.LogFactory
.getLog(FarmWarDeployer.class);
/**
* The descriptive information about this implementation.
*/
private static final String info = "FarmWarDeployer/1.2";
/*--Instance Variables--------------------------------------*/
protected CatalinaCluster cluster = null;
protected boolean started = false; //default 5 seconds
protected HashMap fileFactories = new HashMap();
protected String deployDir;
protected String tempDir;
protected String watchDir;
protected boolean watchEnabled = false;
protected WarWatcher watcher = null;
/**
* Iteration count for background processing.
*/
private int count = 0;
/**
* 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).
*/
protected int processDeployFrequency = 2;
/**
* Path where context descriptors should be deployed.
*/
protected File configBase = null;
/**
* The associated host.
*/
protected Host host = null;
/**
* The host appBase.
*/
protected File appBase = null;
/**
* MBean server.
*/
protected MBeanServer mBeanServer = null;
/**
* The associated deployer ObjectName.
*/
protected ObjectName oname = null;
/*--Constructor---------------------------------------------*/
public FarmWarDeployer() {
}
/**
* Return descriptive information about this deployer implementation and the
* corresponding version number, in the format
* <code><description>/<version>.
*/
public String getInfo() {
return (info);
}
/*--Logic---------------------------------------------------*/
public void start() throws Exception {
if (started)
return;
Container hcontainer = getCluster().getContainer();
if(!(hcontainer instanceof Host)) {
log.error("FarmWarDeployer can only work as host cluster subelement!");
return ;
}
host = (Host) hcontainer;
// Check to correct engine and host setup
Container econtainer = host.getParent();
if(econtainer == null && econtainer instanceof Engine) {
log.error("FarmWarDeployer can only work if parent of " + host.getName()+ " is an engine!");
return ;
}
Engine engine = (Engine) econtainer;
String hostname = null;
hostname = host.getName();
try {
oname = new ObjectName(engine.getName() + ":type=Deployer,host="
+ hostname);
} catch (Exception e) {
log.error("Can't construct MBean object name" + e);
return;
}
if (watchEnabled) {
watcher = new WarWatcher(this, new File(getWatchDir()));
if (log.isInfoEnabled()) {
log.info("Cluster deployment is watching " + getWatchDir()
+ " for changes.");
}
}
configBase = new File(System.getProperty("catalina.base"), "conf");
if (engine != null) {
configBase = new File(configBase, engine.getName());
}
if (host != null) {
configBase = new File(configBase, hostname);
}
// Retrieve the MBean server
mBeanServer = Registry.getRegistry(null, null).getMBeanServer();
started = true;
count = 0;
getCluster().addClusterListener(this);
if (log.isInfoEnabled())
log.info("Cluster FarmWarDeployer started.");
}
/*
* stop cluster wide deployments
*
* @see org.apache.catalina.ha.ClusterDeployer#stop()
*/
public void stop() throws LifecycleException {
started = false;
getCluster().removeClusterListener(this);
count = 0;
if (watcher != null) {
watcher.clear();
watcher = null;
}
if (log.isInfoEnabled())
log.info("Cluster FarmWarDeployer stopped.");
}
public void cleanDeployDir() {
throw new java.lang.UnsupportedOperationException(
"Method cleanDeployDir() not yet implemented.");
}
/**
* Callback from the cluster, when a message is received, The cluster will
* broadcast it invoking the messageReceived on the receiver.
*
* @param msg
* ClusterMessage - the message received from the cluster
*/
public void messageReceived(ClusterMessage msg) {
try {
if (msg instanceof FileMessage && msg != null) {
FileMessage fmsg = (FileMessage) msg;
if (log.isDebugEnabled())
log.debug("receive cluster deployment [ path: "
+ fmsg.getContextPath() + " war: "
+ fmsg.getFileName() + " ]");
FileMessageFactory factory = getFactory(fmsg);
// TODO correct second try after app is in service!
if (factory.writeMessage(fmsg)) {
//last message received war file is completed
String name = factory.getFile().getName();
if (!name.endsWith(".war"))
name = name + ".war";
File deployable = new File(getDeployDir(), name);
try {
String path = fmsg.getContextPath();
if (!isServiced(path)) {
addServiced(path);
try {
remove(path);
factory.getFile().renameTo(deployable);
check(path);
} finally {
removeServiced(path);
}
if (log.isDebugEnabled())
log.debug("deployment from " + path
+ " finished.");
} else
log.error("Application " + path
+ " in used. touch war file " + name
+ " again!");
} catch (Exception ex) {
log.error(ex);
} finally {
removeFactory(fmsg);
}
}
} else if (msg instanceof UndeployMessage && msg != null) {
try {
UndeployMessage umsg = (UndeployMessage) msg;
String path = umsg.getContextPath();
if (log.isDebugEnabled())
log.debug("receive cluster undeployment from " + path);
if (!isServiced(path)) {
addServiced(path);
try {
remove(path);
} finally {
removeServiced(path);
}
if (log.isDebugEnabled())
log.debug("undeployment from " + path
+ " finished.");
} else
log.error("Application "
+ path
+ " in used. Sorry not remove from backup cluster nodes!");
} catch (Exception ex) {
log.error(ex);
}
}
} catch (java.io.IOException x) {
log.error("Unable to read farm deploy file message.", x);
}
}
/**
* create factory for all transported war files
*
* @param msg
* @return Factory for all app message (war files)
* @throws java.io.FileNotFoundException
* @throws java.io.IOException
*/
public synchronized FileMessageFactory getFactory(FileMessage msg)
throws java.io.FileNotFoundException, java.io.IOException {
File tmpFile = new File(msg.getFileName());
File writeToFile = new File(getTempDir(), tmpFile.getName());
FileMessageFactory factory = (FileMessageFactory) fileFactories.get(msg
.getFileName());
if (factory == null) {
factory = FileMessageFactory.getInstance(writeToFile, true);
fileFactories.put(msg.getFileName(), factory);
}
return factory;
}
/**
* Remove file (war) from messages)
*
* @param msg
*/
public void removeFactory(FileMessage msg) {
fileFactories.remove(msg.getFileName());
}
/**
* 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
*
* @param msg
* ClusterMessage
* @return boolean - returns true to indicate that messageReceived should be
* invoked. If false is returned, the messageReceived method will
* not be invoked.
*/
public boolean accept(ClusterMessage msg) {
return (msg instanceof FileMessage) || (msg instanceof UndeployMessage);
}
/**
* 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 path. A context path of "" (the empty
* string) should be used for the root application for this container.
* Otherwise, the context path must start with a slash.
* <p>
* If this application is successfully installed locally, a ContainerEvent
* of type <code>INSTALL_EVENT will be sent to all registered
* listeners, with the newly created <code>Context as an argument.
*
* @param contextPath
* The context path to which this application should be installed
* (must be unique)
* @param war
* A URL of type "jar:" that points to a WAR file, or type
* "file:" that points to an unpacked directory structure
* containing the web application to be installed
*
* @exception IllegalArgumentException
* if the specified context path is malformed (it must be ""
* or start with a slash)
* @exception IllegalStateException
* if the specified context path is already attached to an
* existing web application
* @exception IOException
* if an input/output error was encountered during
* installation
*/
public void install(String contextPath, URL war) throws IOException {
Member[] members = getCluster().getMembers();
Member localMember = getCluster().getLocalMember();
FileMessageFactory factory = FileMessageFactory.getInstance(new File(
war.getFile()), false);
FileMessage msg = new FileMessage(localMember, war.getFile(),
contextPath);
if(log.isDebugEnabled())
log.debug("Send cluster war deployment [ path:"
+ contextPath + " war: " + war + " ] started.");
msg = factory.readMessage(msg);
while (msg != null) {
for (int i = 0; i < members.length; i++) {
if (log.isDebugEnabled())
log.debug("Send cluster war fragment [ path: "
+ contextPath + " war: " + war + " to: " + members[i] + " ]");
getCluster().send(msg, members[i]);
}
msg = factory.readMessage(msg);
}
if(log.isDebugEnabled())
log.debug("Send cluster war deployment [ path: "
+ contextPath + " war: " + war + " ] finished.");
}
/**
* Remove an existing web application, attached to the specified context
* path. If this application is successfully removed, a ContainerEvent of
* type <code>REMOVE_EVENT will be sent to all registered
* listeners, with the removed <code>Context as an argument.
* Deletes the web application war file and/or directory if they exist in
* the Host's appBase.
*
* @param contextPath
* The context path of the application to be removed
* @param undeploy
* boolean flag to remove web application from server
*
* @exception IllegalArgumentException
* if the specified context path is malformed (it must be ""
* or start with a slash)
* @exception IllegalArgumentException
* if the specified context path does not identify a
* currently installed web application
* @exception IOException
* if an input/output error occurs during removal
*/
public void remove(String contextPath, boolean undeploy) throws IOException {
if (log.isInfoEnabled())
log.info("Cluster wide remove of web app " + contextPath);
Member localMember = getCluster().getLocalMember();
UndeployMessage msg = new UndeployMessage(localMember, System
.currentTimeMillis(), "Undeploy:" + contextPath + ":"
+ System.currentTimeMillis(), contextPath, undeploy);
if (log.isDebugEnabled())
log.debug("Send cluster wide undeployment from "
+ contextPath );
cluster.send(msg);
// remove locally
if (undeploy) {
try {
if (!isServiced(contextPath)) {
addServiced(contextPath);
try {
remove(contextPath);
} finally {
removeServiced(contextPath);
}
} else
log.error("Local remove from " + contextPath
+ "failed, other manager has app in service!");
} catch (Exception ex) {
log.error("local remove from " + contextPath + " failed", ex);
}
}
}
/*
* Modifcation from watchDir war detected!
*
* @see org.apache.catalina.ha.deploy.FileChangeListener#fileModified(java.io.File)
*/
public void fileModified(File newWar) {
try {
File deployWar = new File(getDeployDir(), newWar.getName());
copy(newWar, deployWar);
String contextName = getContextName(deployWar);
if (log.isInfoEnabled())
log.info("Installing webapp[" + contextName + "] from "
+ deployWar.getAbsolutePath());
try {
remove(contextName, false);
} catch (Exception x) {
log.error("No removal", x);
}
install(contextName, deployWar.toURL());
} catch (Exception x) {
log.error("Unable to install WAR file", x);
}
}
/*
* War remvoe from watchDir
*
* @see org.apache.catalina.ha.deploy.FileChangeListener#fileRemoved(java.io.File)
*/
public void fileRemoved(File removeWar) {
try {
String contextName = getContextName(removeWar);
if (log.isInfoEnabled())
log.info("Removing webapp[" + contextName + "]");
remove(contextName, true);
} catch (Exception x) {
log.error("Unable to remove WAR file", x);
}
}
/**
* Create a context path from war
* @param war War filename
* @return '/filename' or if war name is ROOT.war context name is empty string ''
*/
protected String getContextName(File war) {
String contextName = "/"
+ war.getName().substring(0,
war.getName().lastIndexOf(".war"));
if("/ROOT".equals(contextName))
contextName= "" ;
return contextName ;
}
/**
* Given a context path, get the config file name.
*/
protected String getConfigFile(String path) {
String basename = null;
if (path.equals("")) {
basename = "ROOT";
} else {
basename = path.substring(1).replace('/', '#');
}
return (basename);
}
/**
* Given a context path, get the config file name.
*/
protected String getDocBase(String path) {
String basename = null;
if (path.equals("")) {
basename = "ROOT";
} else {
basename = path.substring(1);
}
return (basename);
}
/**
* Return a File object representing the "application root" directory for
* our associated Host.
*/
protected File getAppBase() {
if (appBase != null) {
return appBase;
}
File file = new File(host.getAppBase());
if (!file.isAbsolute())
file = new File(System.getProperty("catalina.base"), host
.getAppBase());
try {
appBase = file.getCanonicalFile();
} catch (IOException e) {
appBase = file;
}
return (appBase);
}
/**
* Invoke the remove method on the deployer.
*/
protected void remove(String path) throws Exception {
// TODO Handle remove also work dir content !
// Stop the context first to be nicer
Context context = (Context) host.findChild(path);
if (context != null) {
if(log.isDebugEnabled())
log.debug("Undeploy local context " +path );
((Lifecycle) context).stop();
File war = new File(getAppBase(), getDocBase(path) + ".war");
File dir = new File(getAppBase(), getDocBase(path));
File xml = new File(configBase, getConfigFile(path) + ".xml");
if (war.exists()) {
war.delete();
} else if (dir.exists()) {
undeployDir(dir);
} else {
xml.delete();
}
// Perform new deployment and remove internal HostConfig state
check(path);
}
}
/**
* Delete the specified directory, including all of its contents and
* subdirectories recursively.
*
* @param dir
* File object representing the directory to be deleted
*/
protected void undeployDir(File dir) {
String files[] = dir.list();
if (files == null) {
files = new String[0];
}
for (int i = 0; i < files.length; i++) {
File file = new File(dir, files[i]);
if (file.isDirectory()) {
undeployDir(file);
} else {
file.delete();
}
}
dir.delete();
}
/*
* Call watcher to check for deploy changes
*
* @see org.apache.catalina.ha.ClusterDeployer#backgroundProcess()
*/
public void backgroundProcess() {
if (started) {
count = (count + 1) % processDeployFrequency;
if (count == 0 && watchEnabled) {
watcher.check();
}
}
}
/*--Deployer Operations ------------------------------------*/
/**
* Invoke the check method on the deployer.
*/
protected void check(String name) throws Exception {
String[] params = { name };
String[] signature = { "java.lang.String" };
mBeanServer.invoke(oname, "check", params, signature);
}
/**
* Invoke the check method on the deployer.
*/
protected boolean isServiced(String name) throws Exception {
String[] params = { name };
String[] signature = { "java.lang.String" };
Boolean result = (Boolean) mBeanServer.invoke(oname, "isServiced",
params, signature);
return result.booleanValue();
}
/**
* Invoke the check method on the deployer.
*/
protected void addServiced(String name) throws Exception {
String[] params = { name };
String[] signature = { "java.lang.String" };
mBeanServer.invoke(oname, "addServiced", params, signature);
}
/**
* Invoke the check method on the deployer.
*/
protected void removeServiced(String name) throws Exception {
String[] params = { name };
String[] signature = { "java.lang.String" };
mBeanServer.invoke(oname, "removeServiced", params, signature);
}
/*--Instance Getters/Setters--------------------------------*/
public CatalinaCluster getCluster() {
return cluster;
}
public void setCluster(CatalinaCluster cluster) {
this.cluster = cluster;
}
public boolean equals(Object listener) {
return super.equals(listener);
}
public int hashCode() {
return super.hashCode();
}
public String getDeployDir() {
return deployDir;
}
public void setDeployDir(String deployDir) {
this.deployDir = deployDir;
}
public String getTempDir() {
return tempDir;
}
public void setTempDir(String tempDir) {
this.tempDir = tempDir;
}
public String getWatchDir() {
return watchDir;
}
public void setWatchDir(String watchDir) {
this.watchDir = watchDir;
}
public boolean isWatchEnabled() {
return watchEnabled;
}
public boolean getWatchEnabled() {
return watchEnabled;
}
public void setWatchEnabled(boolean watchEnabled) {
this.watchEnabled = watchEnabled;
}
/**
* Return the frequency of watcher checks.
*/
public int getProcessDeployFrequency() {
return (this.processDeployFrequency);
}
/**
* Set the watcher checks frequency.
*
* @param processExpiresFrequency
* the new manager checks frequency
*/
public void setProcessDeployFrequency(int processExpiresFrequency) {
if (processExpiresFrequency <= 0) {
return;
}
this.processDeployFrequency = processExpiresFrequency;
}
/**
* Copy a file to the specified temp directory.
* @param from copy from temp
* @param to to host appBase directory
* @return true, copy successful
*/
protected boolean copy(File from, File to) {
try {
if (!to.exists())
to.createNewFile();
java.io.FileInputStream is = new java.io.FileInputStream(from);
java.io.FileOutputStream os = new java.io.FileOutputStream(to,
false);
byte[] buf = new byte[4096];
while (true) {
int len = is.read(buf);
if (len < 0)
break;
os.write(buf, 0, len);
}
is.close();
os.close();
} catch (IOException e) {
log.error("Unable to copy file from:" + from + " to:" + to, e);
return false;
}
return true;
}
}
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