/*
* 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.tribes.membership;
import java.util.Properties;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.MembershipListener;
import org.apache.catalina.tribes.MembershipService;
import org.apache.catalina.tribes.util.StringManager;
import org.apache.catalina.tribes.util.UUIDGenerator;
import java.io.IOException;
/**
* A <b>membership</b> implementation using simple multicast.
* This is the representation of a multicast membership service.
* This class is responsible for maintaining a list of active cluster nodes in the cluster.
* If a node fails to send out a heartbeat, the node will be dismissed.
*
* @author Filip Hanik
* @version $Revision: 522651 $, $Date: 2007-03-27 00:24:32 +0200 (mar., 27 mars 2007) $
*/
public class McastService implements MembershipService,MembershipListener {
private static org.apache.juli.logging.Log log =
org.apache.juli.logging.LogFactory.getLog( McastService.class );
/**
* The string manager for this package.
*/
protected StringManager sm = StringManager.getManager(Constants.Package);
/**
* The descriptive information about this implementation.
*/
private static final String info = "McastService/2.1";
/**
* The implementation specific properties
*/
protected Properties properties = new Properties();
/**
* A handle to the actual low level implementation
*/
protected McastServiceImpl impl;
/**
* A membership listener delegate (should be the cluster :)
*/
protected MembershipListener listener;
/**
* The local member
*/
protected MemberImpl localMember ;
private int mcastSoTimeout;
private int mcastTTL;
protected byte[] payload;
protected byte[] domain;
/**
* Create a membership service.
*/
public McastService() {
//default values
properties.setProperty("mcastPort","45564");
properties.setProperty("mcastAddress","228.0.0.4");
properties.setProperty("memberDropTime","3000");
properties.setProperty("mcastFrequency","500");
}
/**
* Return descriptive information about this implementation and the
* corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo() {
return (info);
}
/**
*
* @param properties
* <BR/>All are required<BR />
* 1. mcastPort - the port to listen to<BR>
* 2. mcastAddress - the mcast group address<BR>
* 4. bindAddress - the bind address if any - only one that can be null<BR>
* 5. memberDropTime - the time a member is gone before it is considered gone.<BR>
* 6. mcastFrequency - the frequency of sending messages<BR>
* 7. tcpListenPort - the port this member listens to<BR>
* 8. tcpListenHost - the bind address of this member<BR>
* @exception java.lang.IllegalArgumentException if a property is missing.
*/
public void setProperties(Properties properties) {
hasProperty(properties,"mcastPort");
hasProperty(properties,"mcastAddress");
hasProperty(properties,"memberDropTime");
hasProperty(properties,"mcastFrequency");
hasProperty(properties,"tcpListenPort");
hasProperty(properties,"tcpListenHost");
this.properties = properties;
}
/**
* Return the properties, see setProperties
*/
public Properties getProperties() {
return properties;
}
/**
* Return the local member name
*/
public String getLocalMemberName() {
return localMember.toString() ;
}
/**
* Return the local member
*/
public Member getLocalMember(boolean alive) {
if ( alive && localMember != null && impl != null) localMember.setMemberAliveTime(System.currentTimeMillis()-impl.getServiceStartTime());
return localMember;
}
/**
* Sets the local member properties for broadcasting
*/
public void setLocalMemberProperties(String listenHost, int listenPort) {
properties.setProperty("tcpListenHost",listenHost);
properties.setProperty("tcpListenPort",String.valueOf(listenPort));
try {
if (localMember != null) {
localMember.setHostname(listenHost);
localMember.setPort(listenPort);
} else {
localMember = new MemberImpl(listenHost, listenPort, 0);
localMember.setUniqueId(UUIDGenerator.randomUUID(true));
localMember.setPayload(getPayload());
localMember.setDomain(getDomain());
}
localMember.getData(true, true);
}catch ( IOException x ) {
throw new IllegalArgumentException(x);
}
}
public void setAddress(String addr) {
properties.setProperty("mcastAddress", addr);
}
/**
* @deprecated use setAddress
* @param addr String
*/
public void setMcastAddr(String addr) {
setAddress(addr);
}
public String getAddress() {
return properties.getProperty("mcastAddress");
}
/**
* @deprecated use getAddress
* @return String
*/
public String getMcastAddr() {
return getAddress();
}
public void setMcastBindAddress(String bindaddr) {
setBind(bindaddr);
}
public void setBind(String bindaddr) {
properties.setProperty("mcastBindAddress", bindaddr);
}
/**
* @deprecated use getBind
* @return String
*/
public String getMcastBindAddress() {
return getBind();
}
public String getBind() {
return properties.getProperty("mcastBindAddress");
}
/**
* @deprecated use setPort
* @param port int
*/
public void setMcastPort(int port) {
setPort(port);
}
public void setPort(int port) {
properties.setProperty("mcastPort", String.valueOf(port));
}
/**
* @deprecated use getPort()
* @return int
*/
public int getMcastPort() {
return getPort();
}
public int getPort() {
String p = properties.getProperty("mcastPort");
return new Integer(p).intValue();
}
/**
* @deprecated use setFrequency
* @param time long
*/
public void setMcastFrequency(long time) {
setFrequency(time);
}
public void setFrequency(long time) {
properties.setProperty("mcastFrequency", String.valueOf(time));
}
/**
* @deprecated use getFrequency
* @return long
*/
public long getMcastFrequency() {
return getFrequency();
}
public long getFrequency() {
String p = properties.getProperty("mcastFrequency");
return new Long(p).longValue();
}
public void setMcastDropTime(long time) {
setDropTime(time);
}
public void setDropTime(long time) {
properties.setProperty("memberDropTime", String.valueOf(time));
}
/**
* @deprecated use getDropTime
* @return long
*/
public long getMcastDropTime() {
return getDropTime();
}
public long getDropTime() {
String p = properties.getProperty("memberDropTime");
return new Long(p).longValue();
}
/**
* Check if a required property is available.
* @param properties The set of properties
* @param name The property to check for
*/
protected void hasProperty(Properties properties, String name){
if ( properties.getProperty(name)==null) throw new IllegalArgumentException("McastService:Required property \""+name+"\" is missing.");
}
/**
* Start broadcasting and listening to membership pings
* @throws java.lang.Exception if a IO error occurs
*/
public void start() throws java.lang.Exception {
start(MembershipService.MBR_RX);
start(MembershipService.MBR_TX);
}
public void start(int level) throws java.lang.Exception {
hasProperty(properties,"mcastPort");
hasProperty(properties,"mcastAddress");
hasProperty(properties,"memberDropTime");
hasProperty(properties,"mcastFrequency");
hasProperty(properties,"tcpListenPort");
hasProperty(properties,"tcpListenHost");
if ( impl != null ) {
impl.start(level);
return;
}
String host = getProperties().getProperty("tcpListenHost");
int port = Integer.parseInt(getProperties().getProperty("tcpListenPort"));
if ( localMember == null ) {
localMember = new MemberImpl(host, port, 100);
localMember.setUniqueId(UUIDGenerator.randomUUID(true));
} else {
localMember.setHostname(host);
localMember.setPort(port);
localMember.setMemberAliveTime(100);
}
if ( this.payload != null ) localMember.setPayload(payload);
if ( this.domain != null ) localMember.setDomain(domain);
localMember.setServiceStartTime(System.currentTimeMillis());
java.net.InetAddress bind = null;
if ( properties.getProperty("mcastBindAddress")!= null ) {
bind = java.net.InetAddress.getByName(properties.getProperty("mcastBindAddress"));
}
int ttl = -1;
int soTimeout = -1;
if ( properties.getProperty("mcastTTL") != null ) {
try {
ttl = Integer.parseInt(properties.getProperty("mcastTTL"));
} catch ( Exception x ) {
log.error("Unable to parse mcastTTL="+properties.getProperty("mcastTTL"),x);
}
}
if ( properties.getProperty("mcastSoTimeout") != null ) {
try {
soTimeout = Integer.parseInt(properties.getProperty("mcastSoTimeout"));
} catch ( Exception x ) {
log.error("Unable to parse mcastSoTimeout="+properties.getProperty("mcastSoTimeout"),x);
}
}
impl = new McastServiceImpl((MemberImpl)localMember,Long.parseLong(properties.getProperty("mcastFrequency")),
Long.parseLong(properties.getProperty("memberDropTime")),
Integer.parseInt(properties.getProperty("mcastPort")),
bind,
java.net.InetAddress.getByName(properties.getProperty("mcastAddress")),
ttl,
soTimeout,
this);
impl.start(level);
}
/**
* Stop broadcasting and listening to membership pings
*/
public void stop(int svc) {
try {
if ( impl != null && impl.stop(svc) ) impl = null;
} catch ( Exception x) {
log.error("Unable to stop the mcast service, level:"+svc+".",x);
}
}
/**
* Return all the members by name
*/
public String[] getMembersByName() {
Member[] currentMembers = getMembers();
String [] membernames ;
if(currentMembers != null) {
membernames = new String[currentMembers.length];
for (int i = 0; i < currentMembers.length; i++) {
membernames[i] = currentMembers[i].toString() ;
}
} else
membernames = new String[0] ;
return membernames ;
}
/**
* Return the member by name
*/
public Member findMemberByName(String name) {
Member[] currentMembers = getMembers();
for (int i = 0; i < currentMembers.length; i++) {
if (name.equals(currentMembers[i].toString()))
return currentMembers[i];
}
return null;
}
/**
* has members?
*/
public boolean hasMembers() {
if ( impl == null || impl.membership == null ) return false;
return impl.membership.hasMembers();
}
public Member getMember(Member mbr) {
if ( impl == null || impl.membership == null ) return null;
return impl.membership.getMember(mbr);
}
/**
* Return all the members
*/
protected static final Member[]EMPTY_MEMBERS = new Member[0];
public Member[] getMembers() {
if ( impl == null || impl.membership == null ) return EMPTY_MEMBERS;
return impl.membership.getMembers();
}
/**
* Add a membership listener, this version only supports one listener per service,
* so calling this method twice will result in only the second listener being active.
* @param listener The listener
*/
public void setMembershipListener(MembershipListener listener) {
this.listener = listener;
}
/**
* Remove the membership listener
*/
public void removeMembershipListener(){
listener = null;
}
public void memberAdded(Member member) {
if ( listener!=null ) listener.memberAdded(member);
}
/**
* Callback from the impl when a new member has been received
* @param member The member
*/
public void memberDisappeared(Member member)
{
if ( listener!=null ) listener.memberDisappeared(member);
}
/**
* @deprecated use getSoTimeout
* @return int
*/
public int getMcastSoTimeout() {
return getSoTimeout();
}
public int getSoTimeout() {
return mcastSoTimeout;
}
/**
* @deprecated use setSoTimeout
* @param mcastSoTimeout int
*/
public void setMcastSoTimeout(int mcastSoTimeout) {
setSoTimeout(mcastSoTimeout);
}
public void setSoTimeout(int mcastSoTimeout) {
this.mcastSoTimeout = mcastSoTimeout;
properties.setProperty("mcastSoTimeout", String.valueOf(mcastSoTimeout));
}
/**
* @deprecated use getTtl
* @return int
*/
public int getMcastTTL() {
return getTtl();
}
public int getTtl() {
return mcastTTL;
}
public byte[] getPayload() {
return payload;
}
public byte[] getDomain() {
return domain;
}
/**
* @deprecated use setTtl
* @param mcastTTL int
*/
public void setMcastTTL(int mcastTTL) {
setTtl(mcastTTL);
}
public void setTtl(int mcastTTL) {
this.mcastTTL = mcastTTL;
properties.setProperty("mcastTTL", String.valueOf(mcastTTL));
}
public void setPayload(byte[] payload) {
this.payload = payload;
if ( localMember != null ) {
localMember.setPayload(payload);
localMember.getData(true,true);
try {
if (impl != null) impl.send(false);
}catch ( Exception x ) {
log.error("Unable to send payload update.",x);
}
}
}
public void setDomain(byte[] domain) {
this.domain = domain;
if ( localMember != null ) {
localMember.setDomain(domain);
localMember.getData(true,true);
try {
if (impl != null) impl.send(false);
}catch ( Exception x ) {
log.error("Unable to send domain update.",x);
}
}
}
/**
* Simple test program
* @param args Command-line arguments
* @throws Exception If an error occurs
*/
public static void main(String args[]) throws Exception {
if(log.isInfoEnabled())
log.info("Usage McastService hostname tcpport");
McastService service = new McastService();
java.util.Properties p = new java.util.Properties();
p.setProperty("mcastPort","5555");
p.setProperty("mcastAddress","224.10.10.10");
p.setProperty("mcastClusterDomain","catalina");
p.setProperty("bindAddress","localhost");
p.setProperty("memberDropTime","3000");
p.setProperty("mcastFrequency","500");
p.setProperty("tcpListenPort","4000");
p.setProperty("tcpListenHost","127.0.0.1");
service.setProperties(p);
service.start();
Thread.sleep(60*1000*60);
}
}
|
