InternalRegionFunctionContext.java example

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/*
 * 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.geode.internal.cache.execute;

import java.util.Map;
import java.util.Set;

import org.apache.geode.cache.PartitionAttributesFactory;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.execute.Function;
import org.apache.geode.cache.execute.RegionFunctionContext;
import org.apache.geode.cache.partition.PartitionRegionHelper;
import org.apache.geode.internal.cache.LocalDataSet;

/**
 * Internal interface used to provide for some essential functionality for
 * {@link RegionFunctionContext} invoked by {@link PartitionRegionHelper}.
 */
public interface InternalRegionFunctionContext extends RegionFunctionContext {

  /**
   * Return a region providing read access limited to the local data set corresponding to the
   * routing keys as specified by the {@link #getFilter()} method of the function context for the
   * given partitioned region.
   * <p>
   * Writes using this Region have no constraints and behave the same as the partitioned region.
   * 
   * @param r region to get the local data set for
   * 
   * @return a region for efficient reads or null if the region is not a partitioned region
   */
  public <K, V> Region<K, V> getLocalDataSet(Region<K, V> r);

  /**
   * Return a map of {@link PartitionAttributesFactory#setColocatedWith(String)} colocated Regions
   * with read access limited to the routing keys as specified by the {@link #getFilter()} method of
   * the function context.
   * <p>
   * Writes using these Region have no constraints and behave the same as a partitioned Region.
   * <p>
   * If there are no colocated regions, return an empty map.
   * 
   * @return an unmodifiable map of {@linkplain Region#getFullPath() region name} to {@link Region}
   */
  public Map<String, LocalDataSet> getColocatedLocalDataSets();

  /**
   * Get the set of bucket IDs for this node as specified by the {@link #getFilter()} method of the
   * function context for the given region.
   * 
   * @param region region to get the local bucket IDs for
   * 
   * @return the set of bucket IDs for this node in this function context for the given region
   */
  public <K, V> Set<Integer> getLocalBucketSet(Region<K, V> region);
}