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/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.client.spi.impl;
import com.hazelcast.client.connection.ClientConnectionManager;
import com.hazelcast.client.connection.nio.ClientConnection;
import com.hazelcast.client.impl.HazelcastClientInstanceImpl;
import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.ClientAddPartitionListenerCodec;
import com.hazelcast.client.impl.protocol.codec.ClientGetPartitionsCodec;
import com.hazelcast.client.spi.ClientClusterService;
import com.hazelcast.client.spi.ClientPartitionService;
import com.hazelcast.client.spi.EventHandler;
import com.hazelcast.cluster.memberselector.MemberSelectors;
import com.hazelcast.core.ExecutionCallback;
import com.hazelcast.core.Member;
import com.hazelcast.core.Partition;
import com.hazelcast.instance.BuildInfo;
import com.hazelcast.logging.ILogger;
import com.hazelcast.nio.Address;
import com.hazelcast.nio.Connection;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.partition.NoDataMemberInClusterException;
import com.hazelcast.util.EmptyStatement;
import com.hazelcast.util.HashUtil;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.TimeUnit;
/**
* The {@link ClientPartitionService} implementation.
*/
public final class ClientPartitionServiceImpl
extends ClientAddPartitionListenerCodec.AbstractEventHandler
implements EventHandler, ClientPartitionService {
private static final long PERIOD = 10;
private static final long INITIAL_DELAY = 10;
private final ExecutionCallback refreshTaskCallback = new RefreshTaskCallback();
private final ConcurrentHashMap partitions = new ConcurrentHashMap(271, 0.75f, 1);
private final ClientExecutionServiceImpl clientExecutionService;
private final HazelcastClientInstanceImpl client;
private final ILogger logger;
private volatile int partitionCount;
private volatile int lastPartitionStateVersion = -1;
private final Object lock = new Object();
public ClientPartitionServiceImpl(HazelcastClientInstanceImpl client) {
this.client = client;
this.logger = client.getLoggingService().getLogger(ClientPartitionService.class);
clientExecutionService = (ClientExecutionServiceImpl) client.getClientExecutionService();
}
public void start() {
//scheduling left in place to support server versions before 3.9.
clientExecutionService.scheduleWithRepetition(new RefreshTask(), INITIAL_DELAY, PERIOD, TimeUnit.SECONDS);
}
public void listenPartitionTable(Connection ownerConnection) throws Exception {
//when we connect to cluster back we need to reset partition state version
lastPartitionStateVersion = -1;
if (((ClientConnection) ownerConnection).getConnectedServerVersion() >= BuildInfo.calculateVersion("3.9")) {
//Servers after 3.9 supports listeners
ClientMessage clientMessage = ClientAddPartitionListenerCodec.encodeRequest();
ClientInvocation invocation = new ClientInvocation(client, clientMessage, null, ownerConnection);
invocation.setEventHandler(this);
invocation.invokeUrgent().get();
}
}
public void refreshPartitions() {
try {
// use internal execution service for all partition refresh process (do not use the user executor thread)
clientExecutionService.execute(new RefreshTask());
} catch (RejectedExecutionException ignored) {
EmptyStatement.ignore(ignored);
}
}
@Override
public void handle(Collection>> collection, int partitionStateVersion) {
processPartitionResponse(collection, partitionStateVersion, true);
}
@Override
public void beforeListenerRegister() {
}
@Override
public void onListenerRegister() {
}
private void waitForPartitionsFetchedOnce() {
while (partitionCount == 0 && client.getConnectionManager().isAlive()) {
if (isClusterFormedByOnlyLiteMembers()) {
throw new NoDataMemberInClusterException(
"Partitions can't be assigned since all nodes in the cluster are lite members");
}
ClientMessage requestMessage = ClientGetPartitionsCodec.encodeRequest();
ClientInvocationFuture future = new ClientInvocation(client, requestMessage, null).invokeUrgent();
try {
ClientMessage responseMessage = future.get();
ClientGetPartitionsCodec.ResponseParameters response =
ClientGetPartitionsCodec.decodeResponse(responseMessage);
processPartitionResponse(response.partitions,
response.partitionStateVersion, response.partitionStateVersionExist);
} catch (Exception e) {
if (client.getLifecycleService().isRunning()) {
logger.warning("Error while fetching cluster partition table!", e);
}
}
}
}
private boolean isClusterFormedByOnlyLiteMembers() {
final ClientClusterService clusterService = client.getClientClusterService();
return clusterService.getMembers(MemberSelectors.DATA_MEMBER_SELECTOR).isEmpty();
}
private boolean processPartitionResponse(Collection>> partitions,
int partitionStateVersion,
boolean partitionStateVersionExist) {
synchronized (lock) {
if (!partitionStateVersionExist || partitionStateVersion > lastPartitionStateVersion) {
for (Map.Entry> entry : partitions) {
Address address = entry.getKey();
for (Integer partition : entry.getValue()) {
this.partitions.put(partition, address);
}
}
partitionCount = this.partitions.size();
lastPartitionStateVersion = partitionStateVersion;
if (logger.isFinestEnabled()) {
logger.finest("Processed partition response. partitionStateVersion : "
+ (partitionStateVersionExist ? partitionStateVersion : "NotAvailable")
+ ", partitionCount :" + partitionCount);
}
}
}
return partitionCount > 0;
}
public void stop() {
partitions.clear();
}
@Override
public Address getPartitionOwner(int partitionId) {
waitForPartitionsFetchedOnce();
return partitions.get(partitionId);
}
@Override
public int getPartitionId(Data key) {
final int pc = getPartitionCount();
if (pc <= 0) {
return 0;
}
int hash = key.getPartitionHash();
return HashUtil.hashToIndex(hash, pc);
}
@Override
public int getPartitionId(Object key) {
final Data data = client.getSerializationService().toData(key);
return getPartitionId(data);
}
@Override
public int getPartitionCount() {
waitForPartitionsFetchedOnce();
return partitionCount;
}
@Override
public Partition getPartition(int partitionId) {
return new PartitionImpl(partitionId);
}
private final class PartitionImpl implements Partition {
private final int partitionId;
private PartitionImpl(int partitionId) {
this.partitionId = partitionId;
}
@Override
public int getPartitionId() {
return partitionId;
}
@Override
public Member getOwner() {
Address owner = getPartitionOwner(partitionId);
if (owner != null) {
return client.getClientClusterService().getMember(owner);
}
return null;
}
@Override
public String toString() {
return "PartitionImpl{partitionId=" + partitionId + '}';
}
}
private final class RefreshTask implements Runnable {
private RefreshTask() {
}
@Override
public void run() {
try {
ClientConnectionManager connectionManager = client.getConnectionManager();
Connection connection = connectionManager.getOwnerConnection();
if (connection == null) {
return;
}
ClientMessage requestMessage = ClientGetPartitionsCodec.encodeRequest();
ClientInvocationFuture future = new ClientInvocation(client, requestMessage, null).invokeUrgent();
future.andThen(refreshTaskCallback);
} catch (Exception e) {
if (client.getLifecycleService().isRunning()) {
logger.warning("Error while fetching cluster partition table!", e);
}
}
}
}
private class RefreshTaskCallback implements ExecutionCallback {
@Override
public void onResponse(ClientMessage responseMessage) {
if (responseMessage == null) {
return;
}
ClientGetPartitionsCodec.ResponseParameters response = ClientGetPartitionsCodec.decodeResponse(responseMessage);
processPartitionResponse(response.partitions, response.partitionStateVersion, response.partitionStateVersionExist);
}
@Override
public void onFailure(Throwable t) {
if (client.getLifecycleService().isRunning()) {
logger.warning("Error while fetching cluster partition table!", t);
}
}
}
}
