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Kubernetes Service Discovery for Hazelcast Discovery SPI
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/*
 * Copyright (c) 2008-2019, 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.collection.impl.list;

import com.hazelcast.collection.impl.collection.CollectionContainer;
import com.hazelcast.collection.impl.collection.CollectionService;
import com.hazelcast.collection.impl.list.operations.ListReplicationOperation;
import com.hazelcast.collection.impl.txnlist.TransactionalListProxy;
import com.hazelcast.config.ListConfig;
import com.hazelcast.core.DistributedObject;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.PartitionReplicationEvent;
import com.hazelcast.transaction.impl.Transaction;
import com.hazelcast.util.ConstructorFunction;
import com.hazelcast.util.ContextMutexFactory;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import static com.hazelcast.util.ConcurrencyUtil.getOrPutSynchronized;

public class ListService extends CollectionService {

    public static final String SERVICE_NAME = "hz:impl:listService";

    private static final Object NULL_OBJECT = new Object();

    private final ConcurrentMap containerMap = new ConcurrentHashMap();
    private final ConcurrentMap quorumConfigCache = new ConcurrentHashMap();
    private final ContextMutexFactory quorumConfigCacheMutexFactory = new ContextMutexFactory();
    private final ConstructorFunction quorumConfigConstructor = new ConstructorFunction() {
        @Override
        public Object createNew(String name) {
            ListConfig lockConfig = nodeEngine.getConfig().findListConfig(name);
            String quorumName = lockConfig.getQuorumName();
            return quorumName == null ? NULL_OBJECT : quorumName;
        }
    };


    public ListService(NodeEngine nodeEngine) {
        super(nodeEngine);
    }

    @Override
    public ListContainer getOrCreateContainer(String name, boolean backup) {
        ListContainer container = containerMap.get(name);
        if (container == null) {
            container = new ListContainer(name, nodeEngine);
            final ListContainer current = containerMap.putIfAbsent(name, container);
            if (current != null) {
                container = current;
            }
        }
        return container;
    }

    @Override
    public ConcurrentMap getContainerMap() {
        return containerMap;
    }

    @Override
    public String getServiceName() {
        return SERVICE_NAME;
    }

    @Override
    public DistributedObject createDistributedObject(String objectId) {
        return new ListProxyImpl(objectId, nodeEngine, this);
    }

    @Override
    public void destroyDistributedObject(String name) {
        super.destroyDistributedObject(name);
        quorumConfigCache.remove(name);
    }

    @Override
    public TransactionalListProxy createTransactionalObject(String name, Transaction transaction) {
        return new TransactionalListProxy(name, transaction, nodeEngine, this);
    }

    @Override
    public Operation prepareReplicationOperation(PartitionReplicationEvent event) {
        final Map migrationData = getMigrationData(event);
        return migrationData.isEmpty()
                ? null
                : new ListReplicationOperation(migrationData, event.getPartitionId(), event.getReplicaIndex());
    }

    @Override
    public String getQuorumName(String name) {
        Object quorumName = getOrPutSynchronized(quorumConfigCache, name, quorumConfigCacheMutexFactory,
                quorumConfigConstructor);
        return quorumName == NULL_OBJECT ? null : (String) quorumName;
    }
}