quickstart.PartitionedRegionVM1 Maven / Gradle / Ivy

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/*
 * Copyright (c) 2010-2015 Pivotal Software, 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. See accompanying
 * LICENSE file.
 */
package quickstart;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import com.gemstone.gemfire.cache.Cache;
import com.gemstone.gemfire.cache.CacheFactory;
import com.gemstone.gemfire.cache.Region;

/**
 * This example shows basic Region operations on a partitioned region, which has
 * data partitions on two VMs. The region is configured to create one extra copy
 * of each data entry. The copies are placed on different VMs, so when one VM
 * shuts down, no data is lost. Operations proceed normally on the other VM.
 * Please refer to the quickstart guide for instructions on how to run this
 * example.
 * 
 * 
 * @author GemStone Systems, Inc.
 */
public class PartitionedRegionVM1 {
  
  // Represents region name for the partitioned region
  public static final String regionName = "PartitionedRegion";

  public static void main(String[] args) throws Exception {
    System.out.println("\nThis example shows the operation of a partitioned region on two VMs.");

    System.out.println("\nConnecting to the distributed system and creating the cache.");
    // Create the cache which causes the cache-xml-file to be parsed
    Cache cache = new CacheFactory()
        .set("name", "PartitionedRegionVM1")
        .set("cache-xml-file", "xml/PartitionedRegion.xml")
        .create();
    
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("\nExample region, " + regionName + ", created in cache.");

    System.out.println("Please start VM2.");
    bufferedReader.readLine();

    // Get the partitioned region from cache
    Region pr = cache.getRegion(regionName);

    // Create three entries in the partitioned region
    final int endCount = 3;
    System.out.println("Putting " + endCount + " entries into " + regionName + ". . .");
    for (int count = 0; count < endCount; count++) {
      String key = "key" + count;
      String value = "value" + count;
      System.out.println("\n     Putting entry: " + key + ", " + value);
      pr.put(key, value);
    }

    System.out.println("\nPlease press Enter in VM2.");
    bufferedReader.readLine();
    
    // destroy and invalidate keys which are present in the partitioned region
    System.out.println("Destroying and invalidating entries in " + regionName + ". . .");
    final String destroyKey = "key0";
    System.out.println("\n     Destroying " + destroyKey);
    pr.destroy(destroyKey);
    final String invalidateKey = "key1";
    System.out.println("\n     Invalidating " + invalidateKey);
    pr.invalidate(invalidateKey);

    System.out.println("\nPlease press Enter in VM2 again.");
    bufferedReader.readLine();
    System.out.println("Getting " + endCount + " entries from " + regionName + " after VM2 is closed. . .");
    for (int count = 0; count < endCount; count++) {
      String key = "key" + count;
      System.out.println("\n     Getting key " + key + ": " + pr.get(key));
    }

    System.out.println("\nClosing the cache and disconnecting.");
    cache.close();
  }
}