org.apache.hadoop.hbase.index.write.recovery.PerRegionIndexWriteCache.java Source code

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Here is the source code for org.apache.hadoop.hbase.index.write.recovery.PerRegionIndexWriteCache.java

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/*
 * Copyright 2014 The Apache Software Foundation
 *
 * 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.hadoop.hbase.index.write.recovery;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.regionserver.HRegion;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;
import org.apache.hadoop.hbase.index.table.HTableInterfaceReference;

public class PerRegionIndexWriteCache {

    private Map<HRegion, Multimap<HTableInterfaceReference, Mutation>> cache = new HashMap<HRegion, Multimap<HTableInterfaceReference, Mutation>>();

    /**
     * Get the edits for the current region. Removes the edits from the cache. To add them back, call
     * {@link #addEdits(HRegion, HTableInterfaceReference, Collection)}.
     * @param region
     * @return Get the edits for the given region. Returns <tt>null</tt> if there are no pending edits
     *         for the region
     */
    public Multimap<HTableInterfaceReference, Mutation> getEdits(HRegion region) {
        return cache.remove(region);
    }

    /**
     * @param region
     * @param table
     * @param collection
     */
    public void addEdits(HRegion region, HTableInterfaceReference table, Collection<Mutation> collection) {
        Multimap<HTableInterfaceReference, Mutation> edits = cache.get(region);
        if (edits == null) {
            edits = ArrayListMultimap.<HTableInterfaceReference, Mutation>create();
            cache.put(region, edits);
        }
        edits.putAll(table, collection);
    }
}