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/*
* 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.tipis;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.catalina.tribes.Channel;
import org.apache.catalina.tribes.ChannelException;
import org.apache.catalina.tribes.ChannelException.FaultyMember;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.RemoteProcessException;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* All-to-all replication for a hash map implementation. Each node in the cluster will carry an identical copy of the
* map.
*
* This map implementation doesn't have a background thread running to replicate changes. If you do have changes without
* invoking put/remove then you need to invoke one of the following methods:
*
*
replicate(Object,boolean) - replicates only the object that belongs to the key
*
replicate(boolean) - Scans the entire map for changes and replicates data
*
* the boolean value in the replicate method used to decide whether to only replicate objects
* that implement the ReplicatedMapEntry interface or to replicate all objects. If an object doesn't
* implement the ReplicatedMapEntry interface each time the object gets replicated the entire object gets
* serialized, hence a call to replicate(true) will replicate all objects in this map that are using this
* node as primary.
*
* REMEMBER TO CALL breakdown() when you are done with the map to avoid memory leaks.
*
* TODO implement periodic sync/transfer thread
* TODO memberDisappeared, should do nothing except change map membership by default it relocates the primary objects
*
* @param The type of Key
* @param The type of Value
*/
public class ReplicatedMap extends AbstractReplicatedMap {
private static final long serialVersionUID = 1L;
// Lazy init to support serialization
private transient volatile Log log;
// --------------------------------------------------------------------------
// CONSTRUCTORS / DESTRUCTORS
// --------------------------------------------------------------------------
/**
* Creates a new map
*
* @param owner The map owner
* @param channel The channel to use for communication
* @param timeout long - timeout for RPC messages
* @param mapContextName String - unique name for this map, to allow multiple maps per channel
* @param initialCapacity int - the size of this map, see HashMap
* @param loadFactor float - load factor, see HashMap
* @param cls Class loaders
*/
public ReplicatedMap(MapOwner owner, Channel channel, long timeout, String mapContextName, int initialCapacity,
float loadFactor, ClassLoader[] cls) {
super(owner, channel, timeout, mapContextName, initialCapacity, loadFactor, Channel.SEND_OPTIONS_DEFAULT, cls,
true);
}
/**
* Creates a new map
*
* @param owner The map owner
* @param channel The channel to use for communication
* @param timeout long - timeout for RPC messages
* @param mapContextName String - unique name for this map, to allow multiple maps per channel
* @param initialCapacity int - the size of this map, see HashMap
* @param cls Class loaders
*/
public ReplicatedMap(MapOwner owner, Channel channel, long timeout, String mapContextName, int initialCapacity,
ClassLoader[] cls) {
super(owner, channel, timeout, mapContextName, initialCapacity, DEFAULT_LOAD_FACTOR,
Channel.SEND_OPTIONS_DEFAULT, cls, true);
}
/**
* Creates a new map
*
* @param owner The map owner
* @param channel The channel to use for communication
* @param timeout long - timeout for RPC messages
* @param mapContextName String - unique name for this map, to allow multiple maps per channel
* @param cls Class loaders
*/
public ReplicatedMap(MapOwner owner, Channel channel, long timeout, String mapContextName, ClassLoader[] cls) {
super(owner, channel, timeout, mapContextName, DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR,
Channel.SEND_OPTIONS_DEFAULT, cls, true);
}
/**
* Creates a new map
*
* @param owner The map owner
* @param channel The channel to use for communication
* @param timeout long - timeout for RPC messages
* @param mapContextName String - unique name for this map, to allow multiple maps per channel
* @param cls Class loaders
* @param terminate boolean - Flag for whether to terminate this map that failed to start.
*/
public ReplicatedMap(MapOwner owner, Channel channel, long timeout, String mapContextName, ClassLoader[] cls,
boolean terminate) {
super(owner, channel, timeout, mapContextName, DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR,
Channel.SEND_OPTIONS_DEFAULT, cls, terminate);
}
// ------------------------------------------------------------------------------
// METHODS TO OVERRIDE
// ------------------------------------------------------------------------------
@Override
protected int getStateMessageType() {
return AbstractReplicatedMap.MapMessage.MSG_STATE_COPY;
}
@Override
protected int getReplicateMessageType() {
return AbstractReplicatedMap.MapMessage.MSG_COPY;
}
@Override
protected Member[] publishEntryInfo(Object key, Object value) throws ChannelException {
if (!(key instanceof Serializable && value instanceof Serializable)) {
return new Member[0];
}
// select a backup node
Member[] backup = getMapMembers();
if (backup == null || backup.length == 0) {
return null;
}
try {
// publish the data out to all nodes
MapMessage msg = new MapMessage(getMapContextName(), MapMessage.MSG_COPY, false, (Serializable) key,
(Serializable) value, null, channel.getLocalMember(false), backup);
getChannel().send(backup, msg, getChannelSendOptions());
} catch (ChannelException e) {
FaultyMember[] faultyMembers = e.getFaultyMembers();
if (faultyMembers.length == 0) {
throw e;
}
List faulty = new ArrayList<>();
for (FaultyMember faultyMember : faultyMembers) {
if (!(faultyMember.getCause() instanceof RemoteProcessException)) {
faulty.add(faultyMember.getMember());
}
}
Member[] realFaultyMembers = faulty.toArray(new Member[0]);
if (realFaultyMembers.length != 0) {
backup = excludeFromSet(realFaultyMembers, backup);
if (backup.length == 0) {
throw e;
} else {
if (getLog().isWarnEnabled()) {
getLog().warn(sm.getString("replicatedMap.unableReplicate.completely", key,
Arrays.toString(backup), Arrays.toString(realFaultyMembers)), e);
}
}
}
}
return backup;
}
@Override
public void memberDisappeared(Member member) {
boolean removed = false;
Log log = getLog();
synchronized (mapMembers) {
removed = (mapMembers.remove(member) != null);
if (!removed) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("replicatedMap.member.disappeared.unknown", member));
}
return; // the member was not part of our map.
}
}
if (log.isInfoEnabled()) {
log.info(sm.getString("replicatedMap.member.disappeared", member));
}
long start = System.currentTimeMillis();
for (Entry> e : innerMap.entrySet()) {
MapEntry entry = innerMap.get(e.getKey());
if (entry == null) {
continue;
}
if (entry.isPrimary()) {
try {
Member[] backup = getMapMembers();
if (backup.length > 0) {
MapMessage msg = new MapMessage(getMapContextName(), MapMessage.MSG_NOTIFY_MAPMEMBER, false,
(Serializable) entry.getKey(), null, null, channel.getLocalMember(false), backup);
getChannel().send(backup, msg, getChannelSendOptions());
}
entry.setBackupNodes(backup);
entry.setPrimary(channel.getLocalMember(false));
} catch (ChannelException x) {
log.error(sm.getString("replicatedMap.unable.relocate", entry.getKey()), x);
}
} else if (member.equals(entry.getPrimary())) {
entry.setPrimary(null);
}
if (entry.getPrimary() == null && entry.isCopy() && entry.getBackupNodes() != null &&
entry.getBackupNodes().length > 0 &&
entry.getBackupNodes()[0].equals(channel.getLocalMember(false))) {
try {
entry.setPrimary(channel.getLocalMember(false));
entry.setBackup(false);
entry.setProxy(false);
entry.setCopy(false);
Member[] backup = getMapMembers();
if (backup.length > 0) {
MapMessage msg = new MapMessage(getMapContextName(), MapMessage.MSG_NOTIFY_MAPMEMBER, false,
(Serializable) entry.getKey(), null, null, channel.getLocalMember(false), backup);
getChannel().send(backup, msg, getChannelSendOptions());
}
entry.setBackupNodes(backup);
if (mapOwner != null) {
mapOwner.objectMadePrimary(entry.getKey(), entry.getValue());
}
} catch (ChannelException x) {
log.error(sm.getString("replicatedMap.unable.relocate", entry.getKey()), x);
}
}
} // while
long complete = System.currentTimeMillis() - start;
if (log.isInfoEnabled()) {
log.info(sm.getString("replicatedMap.relocate.complete", Long.toString(complete)));
}
}
@Override
public void mapMemberAdded(Member member) {
if (member.equals(getChannel().getLocalMember(false))) {
return;
}
boolean memberAdded = false;
synchronized (mapMembers) {
if (!mapMembers.containsKey(member)) {
mapMembers.put(member, Long.valueOf(System.currentTimeMillis()));
memberAdded = true;
}
}
if (memberAdded) {
synchronized (stateMutex) {
Member[] backup = getMapMembers();
for (Entry> e : innerMap.entrySet()) {
MapEntry entry = innerMap.get(e.getKey());
if (entry == null) {
continue;
}
if (entry.isPrimary() && !inSet(member, entry.getBackupNodes())) {
entry.setBackupNodes(backup);
}
}
}
}
}
private Log getLog() {
if (log == null) {
synchronized (this) {
if (log == null) {
log = LogFactory.getLog(ReplicatedMap.class);
}
}
}
return log;
}
}
