SnapshottableMap.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The ASF licenses this file to you 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 org.apache.storm.trident.state.map;

import java.util.Arrays;
import java.util.List;
import org.apache.storm.trident.state.ValueUpdater;
import org.apache.storm.trident.state.snapshot.Snapshottable;


public class SnapshottableMap<T> implements MapState<T>, Snapshottable<T> {
    MapState<T> delegate;
    List<List<Object>> keys;

    public SnapshottableMap(MapState<T> delegate, List<Object> snapshotKey) {
        this.delegate = delegate;
        keys = Arrays.asList(snapshotKey);
    }

    @Override
    public List<T> multiGet(List<List<Object>> keys) {
        return delegate.multiGet(keys);
    }

    @Override
    public List<T> multiUpdate(List<List<Object>> keys, List<ValueUpdater> updaters) {
        return delegate.multiUpdate(keys, updaters);
    }

    @Override
    public void multiPut(List<List<Object>> keys, List<T> vals) {
        delegate.multiPut(keys, vals);
    }

    @Override
    public void beginCommit(Long txid) {
        delegate.beginCommit(txid);
    }

    @Override
    public void commit(Long txid) {
        delegate.commit(txid);
    }

    @Override
    public T get() {
        return multiGet(keys).get(0);
    }

    @Override
    public T update(ValueUpdater updater) {
        List<ValueUpdater> updaters = Arrays.asList(updater);
        return multiUpdate(keys, updaters).get(0);
    }

    @Override
    public void set(T o) {
        multiPut(keys, Arrays.asList(o));
    }

}