io.janusproject.kernel.services.jdk.distributeddata.StandardDistributedDataStructureService.java Source code

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Here is the source code for io.janusproject.kernel.services.jdk.distributeddata.StandardDistributedDataStructureService.java

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/*
 * $Id$
 *
 * Janus platform is an open-source multiagent platform.
 * More details on http://www.janusproject.io
 *
 * Copyright (C) 2014 Sebastian RODRIGUEZ, Nicolas GAUD, Stphane GALLAND.
 *
 * 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 io.janusproject.kernel.services.jdk.distributeddata;

import com.google.common.base.Supplier;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.common.util.concurrent.Service;

import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Map;

import io.janusproject.kernel.services.guava.DMultiMapView;
import io.janusproject.services.AbstractDependentService;
import io.janusproject.services.distributeddata.DMap;
import io.janusproject.services.distributeddata.DMultiMap;
import io.janusproject.services.distributeddata.DistributedDataStructureService;

/**
 * Service providing tools for creating distributed data structures.
 * <p/>
 * This implementation creates standard Java collections that cannot be
 * distributed other several JVM.
 *
 * @author $Author: sgalland$
 * @version $FullVersion$
 * @mavengroupid $GroupId$
 * @mavenartifactid $ArtifactId$
 */
public class StandardDistributedDataStructureService extends AbstractDependentService
        implements DistributedDataStructureService {

    @Override
    public final Class<? extends Service> getServiceType() {
        return DistributedDataStructureService.class;
    }

    @Override
    protected void doStart() {
        notifyStarted();
    }

    @Override
    protected void doStop() {
        notifyStopped();
    }

    @Override
    public <K, V> DMap<K, V> getMap(String name) {
        return new DMapView<>(name, Maps.<K, V>newHashMap());
    }

    @SuppressWarnings("unchecked")
    @Override
    public <K, V> DMap<K, V> getMap(String name, Comparator<? super K> comparator) {
        Map<K, V> map;
        if (comparator == null) {
            map = (Map<K, V>) Maps.newTreeMap();
        } else {
            map = Maps.newTreeMap(comparator);
        }
        return new DMapView<>(name, map);
    }

    @Override
    public <K, V> DMultiMap<K, V> getMultiMap(String name) {
        Map<K, Collection<V>> map = Maps.newHashMap();
        Multimap<K, V> multimap = Multimaps.newListMultimap(map, new ArrayListSupplier<V>());
        return new DMultiMapView<>(name, multimap);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public <K, V> DMultiMap<K, V> getMultiMap(String name, Comparator<? super K> comparator) {
        Map map;
        if (comparator == null) {
            map = Maps.newTreeMap();
        } else {
            map = Maps.newTreeMap(comparator);
        }
        Multimap<K, V> multimap = Multimaps.newListMultimap(map, new ArrayListSupplier<V>());
        return new DMultiMapView<>(name, multimap);
    }

    /**
     * @param <K>
     * @author $Author: sgalland$
     * @version $FullVersion$
     * @mavengroupid $GroupId$
     * @mavenartifactid $ArtifactId$
     */
    private static class ArrayListSupplier<K> implements Supplier<List<K>> {

        /**
         */
        public ArrayListSupplier() {
            //
        }

        @Override
        public List<K> get() {
            return Lists.newArrayList();
        }
    }

}