StaticMembershipProvider.java
/*
* 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.io.Serializable;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.apache.catalina.tribes.Channel;
import org.apache.catalina.tribes.ChannelException;
import org.apache.catalina.tribes.ChannelException.FaultyMember;
import org.apache.catalina.tribes.ChannelListener;
import org.apache.catalina.tribes.Heartbeat;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.group.Response;
import org.apache.catalina.tribes.group.RpcCallback;
import org.apache.catalina.tribes.group.RpcChannel;
import org.apache.catalina.tribes.util.Arrays;
import org.apache.catalina.tribes.util.ExceptionUtils;
import org.apache.catalina.tribes.util.StringManager;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
public class StaticMembershipProvider extends MembershipProviderBase implements RpcCallback, ChannelListener, Heartbeat {
protected static final StringManager sm = StringManager.getManager(StaticMembershipProvider.class);
private static final Log log = LogFactory.getLog(StaticMembershipProvider.class);
protected Channel channel;
protected RpcChannel rpcChannel;
private String membershipName = null;
private byte[] membershipId = null;
protected ArrayList<StaticMember> staticMembers;
protected int sendOptions = Channel.SEND_OPTIONS_ASYNCHRONOUS;
protected long expirationTime = 5000;
protected int connectTimeout = 500;
protected long rpcTimeout = 3000;
protected int startLevel = 0;
// for ping thread
protected boolean useThread = false;
protected long pingInterval = 1000;
protected volatile boolean running = true;
protected PingThread thread = null;
@Override
public void init(Properties properties) throws Exception {
String expirationTimeStr = properties.getProperty("expirationTime");
this.expirationTime = Long.parseLong(expirationTimeStr);
String connectTimeoutStr = properties.getProperty("connectTimeout");
this.connectTimeout = Integer.parseInt(connectTimeoutStr);
String rpcTimeouStr = properties.getProperty("rpcTimeout");
this.rpcTimeout = Long.parseLong(rpcTimeouStr);
this.membershipName = properties.getProperty("membershipName");
this.membershipId = membershipName.getBytes(StandardCharsets.ISO_8859_1);
membership = new Membership(service.getLocalMember(true));
this.rpcChannel = new RpcChannel(this.membershipId, channel, this);
this.channel.addChannelListener(this);
String useThreadStr = properties.getProperty("useThread");
this.useThread = Boolean.parseBoolean(useThreadStr);
String pingIntervalStr = properties.getProperty("pingInterval");
this.pingInterval = Long.parseLong(pingIntervalStr);
}
@Override
public void start(int level) throws Exception {
if (Channel.MBR_RX_SEQ==(level & Channel.MBR_RX_SEQ)) {
//no-op
}
if (Channel.MBR_TX_SEQ==(level & Channel.MBR_TX_SEQ)) {
//no-op
}
startLevel = (startLevel | level);
if (startLevel == (Channel.MBR_RX_SEQ | Channel.MBR_TX_SEQ)) {
startMembership(getAliveMembers(staticMembers.toArray(new Member[0])));
running = true;
if ( thread == null && useThread) {
thread = new PingThread();
thread.setDaemon(true);
thread.setName("StaticMembership.PingThread[" + this.channel.getName() +"]");
thread.start();
}
}
}
@Override
public boolean stop(int level) throws Exception {
if (Channel.MBR_RX_SEQ==(level & Channel.MBR_RX_SEQ)) {
// no-op
}
if (Channel.MBR_TX_SEQ==(level & Channel.MBR_TX_SEQ)) {
// no-op
}
startLevel = (startLevel & (~level));
if ( startLevel == 0 ) {
running = false;
if (thread != null) {
thread.interrupt();
thread = null;
}
if (this.rpcChannel != null) {
this.rpcChannel.breakdown();
}
if (this.channel != null) {
try {
stopMembership(this.getMembers());
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
// Otherwise ignore
}
this.channel.removeChannelListener(this);
this.channel = null;
}
this.rpcChannel = null;
this.membership.reset();
}
return (startLevel == 0);
}
protected void startMembership(Member[] members) throws ChannelException {
if (members.length == 0) {
return;
}
MemberMessage msg = new MemberMessage(membershipId, MemberMessage.MSG_START, service.getLocalMember(true));
Response[] resp = rpcChannel.send(members, msg, RpcChannel.ALL_REPLY, sendOptions, rpcTimeout);
if (resp.length > 0) {
for (Response response : resp) {
messageReceived(response.getMessage(), response.getSource());
}
} else {
log.warn(sm.getString("staticMembershipProvider.startMembership.noReplies"));
}
}
protected Member setupMember(Member mbr) {
// no-op
return mbr;
}
protected void memberAdded(Member member) {
Member mbr = setupMember(member);
if(membership.memberAlive(mbr)) {
Runnable r = () -> {
Thread currentThread = Thread.currentThread();
String name = currentThread.getName();
try {
currentThread.setName("StaticMembership-memberAdded");
membershipListener.memberAdded(mbr);
} finally {
currentThread.setName(name);
}
};
executor.execute(r);
}
}
protected void memberDisappeared(Member member) {
membership.removeMember(member);
Runnable r = () -> {
Thread currentThread = Thread.currentThread();
String name = currentThread.getName();
try {
currentThread.setName("StaticMembership-memberDisappeared");
membershipListener.memberDisappeared(member);
} finally {
currentThread.setName(name);
}
};
executor.execute(r);
}
protected void memberAlive(Member member) {
if (!membership.contains(member)) {
memberAdded(member);
}
membership.memberAlive(member);
}
protected void stopMembership(Member[] members) {
if (members.length == 0 ) {
return;
}
Member localmember = service.getLocalMember(false);
localmember.setCommand(Member.SHUTDOWN_PAYLOAD);
MemberMessage msg = new MemberMessage(membershipId, MemberMessage.MSG_STOP, localmember);
try {
channel.send(members, msg, sendOptions);
} catch (ChannelException e) {
log.error(sm.getString("staticMembershipProvider.stopMembership.sendFailed"), e);
}
}
@Override
public void messageReceived(Serializable msg, Member sender) {
MemberMessage memMsg = (MemberMessage) msg;
Member member = memMsg.getMember();
if (memMsg.getMsgtype() == MemberMessage.MSG_START) {
memberAdded(member);
} else if (memMsg.getMsgtype() == MemberMessage.MSG_STOP) {
memberDisappeared(member);
} else if (memMsg.getMsgtype() == MemberMessage.MSG_PING) {
memberAlive(member);
}
}
@Override
public boolean accept(Serializable msg, Member sender) {
boolean result = false;
if (msg instanceof MemberMessage) {
result = Arrays.equals(this.membershipId, ((MemberMessage) msg).getMembershipId());
}
return result;
}
@Override
public Serializable replyRequest(Serializable msg, final Member sender) {
if (!(msg instanceof MemberMessage)) {
return null;
}
MemberMessage memMsg = (MemberMessage) msg;
if (memMsg.getMsgtype() == MemberMessage.MSG_START) {
messageReceived(memMsg, sender);
memMsg.setMember(service.getLocalMember(true));
return memMsg;
} else if (memMsg.getMsgtype() == MemberMessage.MSG_PING) {
messageReceived(memMsg, sender);
memMsg.setMember(service.getLocalMember(true));
return memMsg;
} else {
// other messages are ignored.
if (log.isInfoEnabled()) {
log.info(sm.getString("staticMembershipProvider.replyRequest.ignored",
memMsg.getTypeDesc()));
}
return null;
}
}
@Override
public void leftOver(Serializable msg, Member sender) {
if (!(msg instanceof MemberMessage)) {
return;
}
MemberMessage memMsg = (MemberMessage) msg;
if (memMsg.getMsgtype() == MemberMessage.MSG_START) {
messageReceived(memMsg, sender);
} else if (memMsg.getMsgtype() == MemberMessage.MSG_PING) {
messageReceived(memMsg, sender);
} else {
// other messages are ignored.
if (log.isInfoEnabled()) {
log.info(sm.getString("staticMembershipProvider.leftOver.ignored",
memMsg.getTypeDesc()));
}
}
}
@Override
public void heartbeat() {
try {
if (!useThread) {
ping();
}
} catch (ChannelException e) {
log.warn(sm.getString("staticMembershipProvider.heartbeat.failed"), e);
}
}
protected void ping() throws ChannelException {
// send ping
Member[] members = getAliveMembers(staticMembers.toArray(new Member[0]));
if (members.length > 0) {
try {
MemberMessage msg = new MemberMessage(membershipId, MemberMessage.MSG_PING, service.getLocalMember(true));
Response[] resp = rpcChannel.send(members, msg, RpcChannel.ALL_REPLY, sendOptions, rpcTimeout);
for (Response response : resp) {
messageReceived(response.getMessage(), response.getSource());
}
} catch (ChannelException ce) {
// Handle known failed members
FaultyMember[] faultyMembers = ce.getFaultyMembers();
for (FaultyMember faultyMember : faultyMembers) {
memberDisappeared(faultyMember.getMember());
}
throw ce;
}
}
// expire
checkExpired();
}
protected void checkExpired() {
Member[] expired = membership.expire(expirationTime);
for (Member member : expired) {
membershipListener.memberDisappeared(member);
}
}
public void setChannel(Channel channel) {
this.channel = channel;
}
public void setStaticMembers(ArrayList<StaticMember> staticMembers) {
this.staticMembers = staticMembers;
}
private Member[] getAliveMembers(Member[] members) {
List<Member> aliveMembers = new ArrayList<>();
for (Member member : members) {
try (Socket socket = new Socket()) {
InetAddress ia = InetAddress.getByAddress(member.getHost());
InetSocketAddress addr = new InetSocketAddress(ia, member.getPort());
socket.connect(addr, connectTimeout);
aliveMembers.add(member);
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
// Otherwise ignore
}
}
return aliveMembers.toArray(new Member[0]);
}
// ------------------------------------------------------------------------------
// member message to send to and from other memberships
// ------------------------------------------------------------------------------
public static class MemberMessage implements Serializable {
private static final long serialVersionUID = 1L;
public static final int MSG_START = 1;
public static final int MSG_STOP = 2;
public static final int MSG_PING = 3;
private final int msgtype;
private final byte[] membershipId;
private Member member;
public MemberMessage(byte[] membershipId, int msgtype, Member member) {
this.membershipId = membershipId;
this.msgtype = msgtype;
this.member = member;
}
public int getMsgtype() {
return msgtype;
}
public byte[] getMembershipId() {
return membershipId;
}
public Member getMember() {
return member;
}
public void setMember(Member local) {
this.member = local;
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder("MemberMessage[");
buf.append("name=");
buf.append(new String(membershipId));
buf.append("; type=");
buf.append(getTypeDesc());
buf.append("; member=");
buf.append(member);
buf.append(']');
return buf.toString();
}
protected String getTypeDesc() {
switch (msgtype) {
case MSG_START:
return "MSG_START";
case MSG_STOP:
return "MSG_STOP";
case MSG_PING:
return "MSG_PING";
default:
return "UNKNOWN";
}
}
}
protected class PingThread extends Thread {
@Override
public void run() {
while (running) {
try {
sleep(pingInterval);
ping();
}catch (InterruptedException ix) {
}catch (Exception x) {
log.warn(sm.getString("staticMembershipProvider.pingThread.failed"),x);
}
}
}
}
}