Package com.hazelcast.client.spi.impl

Source Code of com.hazelcast.client.spi.impl.ClientClusterServiceImpl

/*
* Copyright (c) 2008-2013, 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.ClientImpl;
import com.hazelcast.client.impl.HazelcastClientInstanceImpl;
import com.hazelcast.client.impl.LifecycleServiceImpl;
import com.hazelcast.client.config.ClientAwsConfig;
import com.hazelcast.client.config.ClientConfig;
import com.hazelcast.client.connection.AddressProvider;
import com.hazelcast.client.connection.ClientConnectionManager;
import com.hazelcast.client.connection.nio.ClientConnection;
import com.hazelcast.client.spi.ClientClusterService;
import com.hazelcast.client.spi.ClientExecutionService;
import com.hazelcast.config.ListenerConfig;
import com.hazelcast.core.Client;
import com.hazelcast.core.Cluster;
import com.hazelcast.core.HazelcastException;
import com.hazelcast.core.InitialMembershipEvent;
import com.hazelcast.core.InitialMembershipListener;
import com.hazelcast.core.Member;
import com.hazelcast.core.MemberAttributeEvent;
import com.hazelcast.core.MembershipEvent;
import com.hazelcast.core.MembershipListener;
import com.hazelcast.instance.MemberImpl;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import com.hazelcast.nio.Address;
import com.hazelcast.nio.ClassLoaderUtil;
import com.hazelcast.nio.serialization.SerializationService;
import com.hazelcast.util.Clock;
import com.hazelcast.util.UuidUtil;

import java.util.Collection;
import java.util.Collections;
import java.util.EventListener;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicReference;
import java.util.logging.Level;

import static com.hazelcast.core.LifecycleEvent.LifecycleState;

/**
* The {@llink ClientClusterService} implementation.
*/
public class ClientClusterServiceImpl implements ClientClusterService {

    private static final ILogger LOGGER = Logger.getLogger(ClientClusterService.class);

    private final HazelcastClientInstanceImpl client;
    private final ClientConnectionManager connectionManager;
    private final ClusterListenerThread clusterThread;
    private final AtomicReference<Map<Address, MemberImpl>> membersRef = new AtomicReference<Map<Address, MemberImpl>>();
    private final ConcurrentMap<String, MembershipListener> listeners = new ConcurrentHashMap<String, MembershipListener>();

    public ClientClusterServiceImpl(HazelcastClientInstanceImpl client) {
        this.client = client;
        this.connectionManager = client.getConnectionManager();
        this.clusterThread = createListenerThread();
        final ClientConfig clientConfig = getClientConfig();
        final List<ListenerConfig> listenerConfigs = client.getClientConfig().getListenerConfigs();
        if (listenerConfigs != null && !listenerConfigs.isEmpty()) {
            for (ListenerConfig listenerConfig : listenerConfigs) {
                EventListener listener = listenerConfig.getImplementation();
                if (listener == null) {
                    try {
                        listener = ClassLoaderUtil.newInstance(clientConfig.getClassLoader(), listenerConfig.getClassName());
                    } catch (Exception e) {
                        LOGGER.severe(e);
                    }
                }
                if (listener instanceof MembershipListener) {
                    addMembershipListenerWithoutInit((MembershipListener) listener);
                }
            }
        }
    }

    ClusterListenerThread createListenerThread() {
        final ClientAwsConfig awsConfig = client.getClientConfig().getNetworkConfig().getAwsConfig();
        final Collection<AddressProvider> addressProvider = new LinkedList<AddressProvider>();

        addressProvider.add(new DefaultAddressProvider(getClientConfig().getNetworkConfig()));

        if (awsConfig != null && awsConfig.isEnabled()) {
            try {
                addressProvider.add(new AwsAddressProvider(awsConfig));
            } catch (NoClassDefFoundError e) {
                LOGGER.log(Level.WARNING, "hazelcast-cloud.jar might be missing!");
                throw e;
            }
        }
        return new ClusterListenerThread(client.getThreadGroup(), client.getName() + ".cluster-listener",
                addressProvider);
    }

    @Override
    public MemberImpl getMember(Address address) {
        final Map<Address, MemberImpl> members = membersRef.get();
        return members != null ? members.get(address) : null;
    }

    @Override
    public MemberImpl getMember(String uuid) {
        final Collection<MemberImpl> memberList = getMemberList();
        for (MemberImpl member : memberList) {
            if (uuid.equals(member.getUuid())) {
                return member;
            }
        }
        return null;
    }

    @Override
    public Collection<MemberImpl> getMemberList() {
        final Map<Address, MemberImpl> members = membersRef.get();
        return members != null ? members.values() : Collections.<MemberImpl>emptySet();
    }

    @Override
    public Address getMasterAddress() {
        final Collection<MemberImpl> memberList = getMemberList();
        return !memberList.isEmpty() ? memberList.iterator().next().getAddress() : null;
    }

    @Override
    public int getSize() {
        return getMemberList().size();
    }

    @Override
    public long getClusterTime() {
        return Clock.currentTimeMillis();
    }

    @Override
    public Client getLocalClient() {
        final String uuid = connectionManager.getUuid();
        ClientConnection conn = clusterThread.getConnection();
        return new ClientImpl(uuid, conn != null ? conn.getLocalSocketAddress() : null);
    }

    SerializationService getSerializationService() {
        return client.getSerializationService();
    }

    @Override
    public String addMembershipListener(MembershipListener listener) {
        if (listener == null) {
            throw new NullPointerException("listener can't be null");
        }

        final String id = UuidUtil.buildRandomUuidString();
        listeners.put(id, listener);
        if (listener instanceof InitialMembershipListener) {
            // TODO: needs sync with membership events...
            final Cluster cluster = client.getCluster();
            ((InitialMembershipListener) listener).init(new InitialMembershipEvent(cluster, cluster.getMembers()));
        }
        return id;
    }

    private String addMembershipListenerWithoutInit(MembershipListener listener) {
        final String id = UUID.randomUUID().toString();
        listeners.put(id, listener);
        return id;
    }

    private void initMembershipListener() {
        for (MembershipListener membershipListener : listeners.values()) {
            if (membershipListener instanceof InitialMembershipListener) {
                // TODO: needs sync with membership events...
                Cluster cluster = client.getCluster();
                InitialMembershipEvent event = new InitialMembershipEvent(cluster, cluster.getMembers());
                ((InitialMembershipListener) membershipListener).init(event);
            }
        }
    }

    @Override
    public boolean removeMembershipListener(String registrationId) {
        if (registrationId == null) {
            throw new NullPointerException("registrationId can't be null");
        }

        return listeners.remove(registrationId) != null;
    }

    public void start() {
        clusterThread.init(client);
        clusterThread.start();

        try {
            clusterThread.await();
        } catch (InterruptedException e) {
            throw new HazelcastException(e);
        }
        initMembershipListener();
        // started
    }

    public void stop() {
        clusterThread.shutdown();
    }

    void fireConnectionEvent(boolean disconnected) {
        final LifecycleServiceImpl lifecycleService = (LifecycleServiceImpl) client.getLifecycleService();
        final LifecycleState state = disconnected ? LifecycleState.CLIENT_DISCONNECTED : LifecycleState.CLIENT_CONNECTED;
        lifecycleService.fireLifecycleEvent(state);
    }

    private ClientConfig getClientConfig() {
        return client.getClientConfig();
    }

    String membersString() {
        StringBuilder sb = new StringBuilder("\n\nMembers [");
        final Collection<MemberImpl> members = getMemberList();
        sb.append(members != null ? members.size() : 0);
        sb.append("] {");
        if (members != null) {
            for (Member member : members) {
                sb.append("\n\t").append(member);
            }
        }
        sb.append("\n}\n");
        return sb.toString();
    }

    void fireMembershipEvent(final MembershipEvent event) {
        ClientExecutionService clientExecutionService = client.getClientExecutionService();
        clientExecutionService.execute(new Runnable() {
            @Override
            public void run() {
                for (MembershipListener listener : listeners.values()) {
                    if (event.getEventType() == MembershipEvent.MEMBER_ADDED) {
                        listener.memberAdded(event);
                    } else {
                        listener.memberRemoved(event);
                    }
                }
            }
        });
    }

    void fireMemberAttributeEvent(final MemberAttributeEvent event) {
        ClientExecutionService clientExecutionService = client.getClientExecutionService();
        clientExecutionService.execute(new Runnable() {
            @Override
            public void run() {
                for (MembershipListener listener : listeners.values()) {
                    listener.memberAttributeChanged(event);
                }
            }
        });
    }

    Map<Address, MemberImpl> getMembersRef() {
        return membersRef.get();
    }

    void setMembersRef(Map<Address, MemberImpl> map) {
        membersRef.set(map);
    }
}
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