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GossipManager.java
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GossipManager.java
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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.gossip.manager;
import com.codahale.metrics.MetricRegistry;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.gossip.GossipSettings;
import org.apache.gossip.LocalMember;
import org.apache.gossip.Member;
import org.apache.gossip.crdt.Crdt;
import org.apache.gossip.event.GossipListener;
import org.apache.gossip.event.GossipState;
import org.apache.gossip.event.data.UpdateNodeDataEventHandler;
import org.apache.gossip.event.data.UpdateSharedDataEventHandler;
import org.apache.gossip.lock.LockManager;
import org.apache.gossip.lock.exceptions.VoteFailedException;
import org.apache.gossip.manager.handlers.MessageHandler;
import org.apache.gossip.model.PerNodeDataMessage;
import org.apache.gossip.model.SharedDataMessage;
import org.apache.gossip.protocol.ProtocolManager;
import org.apache.gossip.transport.TransportManager;
import org.apache.gossip.utils.ReflectionUtils;
import org.apache.log4j.Logger;
import java.io.File;
import java.net.URI;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Collectors;
public abstract class GossipManager {
public static final Logger LOGGER = Logger.getLogger(GossipManager.class);
// this mapper is used for ring and user-data persistence only. NOT messages.
public static final ObjectMapper metdataObjectMapper = new ObjectMapper() {
private static final long serialVersionUID = 1L;
{
enableDefaultTyping();
configure(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS, false);
}};
private final ConcurrentSkipListMap<LocalMember, GossipState> members;
private final LocalMember me;
private final GossipSettings settings;
private final AtomicBoolean gossipServiceRunning;
private TransportManager transportManager;
private ProtocolManager protocolManager;
private final GossipCore gossipCore;
private final DataReaper dataReaper;
private final Clock clock;
private final ScheduledExecutorService scheduledServiced;
private final MetricRegistry registry;
private final RingStatePersister ringState;
private final UserDataPersister userDataState;
private final GossipMemberStateRefresher memberStateRefresher;
private final MessageHandler messageHandler;
private final LockManager lockManager;
public GossipManager(String cluster,
URI uri, String id, Map<String, String> properties, GossipSettings settings,
List<Member> gossipMembers, GossipListener listener, MetricRegistry registry,
MessageHandler messageHandler) {
this.settings = settings;
this.messageHandler = messageHandler;
clock = new SystemClock();
me = new LocalMember(cluster, uri, id, clock.nanoTime(), properties,
settings.getWindowSize(), settings.getMinimumSamples(), settings.getDistribution());
gossipCore = new GossipCore(this, registry);
this.lockManager = new LockManager(this, settings.getLockManagerSettings(), registry);
dataReaper = new DataReaper(gossipCore, clock);
members = new ConcurrentSkipListMap<>();
for (Member startupMember : gossipMembers) {
if (!startupMember.equals(me)) {
LocalMember member = new LocalMember(startupMember.getClusterName(),
startupMember.getUri(), startupMember.getId(),
clock.nanoTime(), startupMember.getProperties(), settings.getWindowSize(),
settings.getMinimumSamples(), settings.getDistribution());
//TODO should members start in down state?
members.put(member, GossipState.DOWN);
}
}
gossipServiceRunning = new AtomicBoolean(true);
this.scheduledServiced = Executors.newScheduledThreadPool(1);
this.registry = registry;
this.ringState = new RingStatePersister(GossipManager.buildRingStatePath(this), this);
this.userDataState = new UserDataPersister(
gossipCore,
GossipManager.buildPerNodeDataPath(this),
GossipManager.buildSharedDataPath(this));
this.memberStateRefresher = new GossipMemberStateRefresher(members, settings, listener, this::findPerNodeGossipData);
readSavedRingState();
readSavedDataState();
}
public MessageHandler getMessageHandler() {
return messageHandler;
}
public ConcurrentSkipListMap<LocalMember, GossipState> getMembers() {
return members;
}
public GossipSettings getSettings() {
return settings;
}
/**
* @return a read only list of members found in the DOWN state.
*/
public List<LocalMember> getDeadMembers() {
return Collections.unmodifiableList(
members.entrySet()
.stream()
.filter(entry -> GossipState.DOWN.equals(entry.getValue()))
.map(Entry::getKey).collect(Collectors.toList()));
}
/**
*
* @return a read only list of members found in the UP state
*/
public List<LocalMember> getLiveMembers() {
return Collections.unmodifiableList(
members.entrySet()
.stream()
.filter(entry -> GossipState.UP.equals(entry.getValue()))
.map(Entry::getKey).collect(Collectors.toList()));
}
public LocalMember getMyself() {
return me;
}
/**
* Starts the client. Specifically, start the various cycles for this protocol. Start the gossip
* thread and start the receiver thread.
*/
public void init() {
// protocol manager and transport managers are specified in settings.
// construct them here via reflection.
protocolManager = ReflectionUtils.constructWithReflection(
settings.getProtocolManagerClass(),
new Class<?>[] { GossipSettings.class, String.class, MetricRegistry.class },
new Object[] { settings, me.getId(), this.getRegistry() }
);
transportManager = ReflectionUtils.constructWithReflection(
settings.getTransportManagerClass(),
new Class<?>[] { GossipManager.class, GossipCore.class},
new Object[] { this, gossipCore }
);
// start processing gossip messages.
transportManager.startEndpoint();
transportManager.startActiveGossiper();
dataReaper.init();
if (settings.isPersistRingState()) {
scheduledServiced.scheduleAtFixedRate(ringState, 60, 60, TimeUnit.SECONDS);
}
if (settings.isPersistDataState()) {
scheduledServiced.scheduleAtFixedRate(userDataState, 60, 60, TimeUnit.SECONDS);
}
memberStateRefresher.init();
LOGGER.debug("The GossipManager is started.");
}
private void readSavedRingState() {
if (settings.isPersistRingState()) {
for (LocalMember l : ringState.readFromDisk()) {
LocalMember member = new LocalMember(l.getClusterName(),
l.getUri(), l.getId(),
clock.nanoTime(), l.getProperties(), settings.getWindowSize(),
settings.getMinimumSamples(), settings.getDistribution());
members.putIfAbsent(member, GossipState.DOWN);
}
}
}
private void readSavedDataState() {
if (settings.isPersistDataState()) {
for (Entry<String, ConcurrentHashMap<String, PerNodeDataMessage>> l : userDataState.readPerNodeFromDisk().entrySet()) {
for (Entry<String, PerNodeDataMessage> j : l.getValue().entrySet()) {
gossipCore.addPerNodeData(j.getValue());
}
}
}
if (settings.isPersistRingState()) {
for (Entry<String, SharedDataMessage> l : userDataState.readSharedDataFromDisk().entrySet()) {
gossipCore.addSharedData(l.getValue());
}
}
}
/**
* Shutdown the gossip service.
*/
public void shutdown() {
gossipServiceRunning.set(false);
lockManager.shutdown();
gossipCore.shutdown();
transportManager.shutdown();
dataReaper.close();
memberStateRefresher.shutdown();
scheduledServiced.shutdown();
try {
scheduledServiced.awaitTermination(1, TimeUnit.SECONDS);
} catch (InterruptedException e) {
LOGGER.error(e);
}
scheduledServiced.shutdownNow();
}
public void gossipPerNodeData(PerNodeDataMessage message){
Objects.nonNull(message.getKey());
Objects.nonNull(message.getTimestamp());
Objects.nonNull(message.getPayload());
message.setNodeId(me.getId());
gossipCore.addPerNodeData(message);
}
public void gossipSharedData(SharedDataMessage message){
Objects.nonNull(message.getKey());
Objects.nonNull(message.getTimestamp());
Objects.nonNull(message.getPayload());
message.setNodeId(me.getId());
gossipCore.addSharedData(message);
}
@SuppressWarnings("rawtypes")
public Crdt findCrdt(String key){
SharedDataMessage l = gossipCore.getSharedData().get(key);
if (l == null){
return null;
}
if (l.getExpireAt() < clock.currentTimeMillis()){
return null;
} else {
return (Crdt) l.getPayload();
}
}
@SuppressWarnings("rawtypes")
public Crdt merge(SharedDataMessage message){
Objects.nonNull(message.getKey());
Objects.nonNull(message.getTimestamp());
Objects.nonNull(message.getPayload());
message.setNodeId(me.getId());
if (! (message.getPayload() instanceof Crdt)){
throw new IllegalArgumentException("Not a subclass of CRDT " + message.getPayload());
}
return gossipCore.merge(message);
}
public PerNodeDataMessage findPerNodeGossipData(String nodeId, String key){
ConcurrentHashMap<String, PerNodeDataMessage> j = gossipCore.getPerNodeData().get(nodeId);
if (j == null){
return null;
} else {
PerNodeDataMessage l = j.get(key);
if (l == null){
return null;
}
if (l.getExpireAt() != null && l.getExpireAt() < clock.currentTimeMillis()) {
return null;
}
return l;
}
}
public SharedDataMessage findSharedGossipData(String key){
SharedDataMessage l = gossipCore.getSharedData().get(key);
if (l == null){
return null;
}
if (l.getExpireAt() < clock.currentTimeMillis()){
return null;
} else {
return l;
}
}
public DataReaper getDataReaper() {
return dataReaper;
}
public RingStatePersister getRingState() {
return ringState;
}
public UserDataPersister getUserDataState() {
return userDataState;
}
public GossipMemberStateRefresher getMemberStateRefresher() {
return memberStateRefresher;
}
public Clock getClock() {
return clock;
}
public MetricRegistry getRegistry() {
return registry;
}
public ProtocolManager getProtocolManager() {
return protocolManager;
}
public TransportManager getTransportManager() {
return transportManager;
}
// todo: consider making these path methods part of GossipSettings
public static File buildRingStatePath(GossipManager manager) {
return new File(manager.getSettings().getPathToRingState(), "ringstate." + manager.getMyself().getClusterName() + "."
+ manager.getMyself().getId() + ".json");
}
public static File buildSharedDataPath(GossipManager manager){
return new File(manager.getSettings().getPathToDataState(), "shareddata."
+ manager.getMyself().getClusterName() + "." + manager.getMyself().getId() + ".json");
}
public static File buildPerNodeDataPath(GossipManager manager) {
return new File(manager.getSettings().getPathToDataState(), "pernodedata."
+ manager.getMyself().getClusterName() + "." + manager.getMyself().getId() + ".json");
}
public void registerPerNodeDataSubscriber(UpdateNodeDataEventHandler handler){
gossipCore.registerPerNodeDataSubscriber(handler);
}
public void registerSharedDataSubscriber(UpdateSharedDataEventHandler handler){
gossipCore.registerSharedDataSubscriber(handler);
}
public void unregisterPerNodeDataSubscriber(UpdateNodeDataEventHandler handler){
gossipCore.unregisterPerNodeDataSubscriber(handler);
}
public void unregisterSharedDataSubscriber(UpdateSharedDataEventHandler handler){
gossipCore.unregisterSharedDataSubscriber(handler);
}
public void registerGossipListener(GossipListener listener) {
memberStateRefresher.register(listener);
}
/**
* Get the lock manager specified with this GossipManager.
* @return lock manager object.
*/
public LockManager getLockManager() {
return lockManager;
}
/**
* Try to acquire a lock on given shared data key.
* @param key key of tha share data object.
* @throws VoteFailedException if the locking is failed.
*/
public void acquireSharedDataLock(String key) throws VoteFailedException{
lockManager.acquireSharedDataLock(key);
}
}