com.hazelcast.client.spi.impl.ClientPartitionServiceImpl Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2015, 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.impl.HazelcastClientInstanceImpl;
import com.hazelcast.client.spi.ClientClusterService;
import com.hazelcast.client.spi.ClientExecutionService;
import com.hazelcast.client.spi.ClientPartitionService;
import com.hazelcast.core.ExecutionCallback;
import com.hazelcast.core.ICompletableFuture;
import com.hazelcast.core.Member;
import com.hazelcast.core.Partition;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import com.hazelcast.nio.Address;
import com.hazelcast.nio.Connection;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.partition.NoDataMemberInClusterException;
import com.hazelcast.partition.client.GetPartitionsRequest;
import com.hazelcast.partition.client.PartitionsResponse;
import com.hazelcast.util.EmptyStatement;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import static com.hazelcast.cluster.memberselector.MemberSelectors.DATA_MEMBER_SELECTOR;
import static com.hazelcast.util.HashUtil.hashToIndex;
/**
* The {@link ClientPartitionService} implementation.
*/
public final class ClientPartitionServiceImpl implements ClientPartitionService {
private static final ILogger LOGGER = Logger.getLogger(ClientPartitionService.class);
private static final long PERIOD = 10;
private static final long INITIAL_DELAY = 10;
private static final int PARTITION_WAIT_TIME = 1000;
private final ExecutionCallback refreshTaskCallback = new RefreshTaskCallback();
private final HazelcastClientInstanceImpl client;
private final ConcurrentHashMap partitions = new ConcurrentHashMap(271, 0.75f, 1);
private final AtomicBoolean updating = new AtomicBoolean(false);
private volatile int partitionCount;
public ClientPartitionServiceImpl(HazelcastClientInstanceImpl client) {
this.client = client;
}
public void start() {
ClientExecutionService clientExecutionService = client.getClientExecutionService();
clientExecutionService.scheduleWithFixedDelay(new RefreshTask(), INITIAL_DELAY, PERIOD, TimeUnit.SECONDS);
}
public void refreshPartitions() {
if (!updating.compareAndSet(false, true)) {
return;
}
ClientExecutionService executionService = client.getClientExecutionService();
try {
ICompletableFuture future = executionService.submit(new RefreshTask());
future.andThen(refreshTaskCallback);
} catch (RejectedExecutionException ignored) {
updating.set(false);
EmptyStatement.ignore(ignored);
}
}
private void getPartitionsBlocking() {
while (!getPartitions() && client.getConnectionManager().isAlive()) {
if (isClusterFormedByOnlyLiteMembers()) {
throw new NoDataMemberInClusterException(
"Partitions can't be assigned since all nodes in the cluster are lite members");
}
try {
Thread.sleep(PARTITION_WAIT_TIME);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
private boolean isClusterFormedByOnlyLiteMembers() {
final ClientClusterService clusterService = client.getClientClusterService();
return clusterService.getMembers(DATA_MEMBER_SELECTOR).isEmpty();
}
private Connection getOwnerConnection() {
ClientClusterService clusterService = client.getClientClusterService();
Address ownerAddress = clusterService.getOwnerConnectionAddress();
if (ownerAddress == null) {
return null;
}
Connection connection = client.getConnectionManager().getConnection(ownerAddress);
if (connection == null) {
return null;
}
return connection;
}
private boolean getPartitions() {
Connection connection = getOwnerConnection();
if (connection == null) {
return false;
}
try {
ClientInvocationFuture future = getPartitionsFrom(connection);
PartitionsResponse response = client.getSerializationService().toObject(future.get());
if (response == null) {
return false;
}
return processPartitionResponse(response);
} catch (Exception e) {
if (client.getLifecycleService().isRunning()) {
LOGGER.warning("Error while fetching cluster partition table!", e);
}
}
return false;
}
private ClientInvocationFuture getPartitionsFrom(Connection connection) {
final GetPartitionsRequest request = new GetPartitionsRequest();
return new ClientInvocation(client, request, connection).invokeUrgent();
}
private boolean processPartitionResponse(PartitionsResponse response) {
Address[] members = response.getMembers();
int[] ownerIndexes = response.getOwnerIndexes();
if (partitionCount == 0) {
partitionCount = ownerIndexes.length;
}
for (int partitionId = 0; partitionId < partitionCount; partitionId++) {
final int ownerIndex = ownerIndexes[partitionId];
if (ownerIndex > -1) {
partitions.put(partitionId, members[ownerIndex]);
}
}
return response.getMembers().length > 0;
}
public void stop() {
partitions.clear();
}
@Override
public Address getPartitionOwner(int partitionId) {
Address address = partitions.get(partitionId);
if (address == null) {
getPartitionsBlocking();
}
return partitions.get(partitionId);
}
@Override
public int getPartitionId(Data key) {
final int pc = getPartitionCount();
if (pc <= 0) {
return 0;
}
int hash = key.getPartitionHash();
return hashToIndex(hash, pc);
}
@Override
public int getPartitionId(Object key) {
final Data data = client.getSerializationService().toData(key);
return getPartitionId(data);
}
@Override
public int getPartitionCount() {
if (partitionCount == 0) {
getPartitionsBlocking();
}
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;
}
public int getPartitionId() {
return partitionId;
}
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 class RefreshTask implements Runnable {
@Override
public void run() {
if (!updating.compareAndSet(false, true)) {
return;
}
Connection connection = getOwnerConnection();
if (connection == null) {
return;
}
ClientInvocationFuture clientInvocationFuture = getPartitionsFrom(connection);
clientInvocationFuture.andThen(refreshTaskCallback);
}
}
private class RefreshTaskCallback
implements ExecutionCallback {
@Override
public void onResponse(PartitionsResponse response) {
try {
processPartitionResponse(response);
} finally {
updating.set(false);
}
}
@Override
public void onFailure(Throwable t) {
if (client.getLifecycleService().isRunning()) {
LOGGER.warning("Error while fetching cluster partition table!", t);
}
updating.set(false);
}
}
}