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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 transaction;

import com.gemstone.gemfire.cache.CacheFactory;
import com.gemstone.gemfire.cache.CacheTransactionManager;
import com.gemstone.gemfire.cache.Region;
import com.gemstone.gemfire.cache.execute.FunctionAdapter;
import com.gemstone.gemfire.cache.execute.FunctionContext;
import com.gemstone.gemfire.cache.execute.RegionFunctionContext;

import java.util.Random;

/**
 * This function does transactional updates to customer and order regions
 */
public class TransactionalFunction extends FunctionAdapter {

  private Random random = new Random();

  /* (non-Javadoc)
   * @see com.gemstone.gemfire.cache.execute.FunctionAdapter#execute(com.gemstone.gemfire.cache.execute.FunctionContext)
   */
  @Override
  public void execute(FunctionContext context) {
    RegionFunctionContext rfc = (RegionFunctionContext)context;
    Region custRegion = rfc.getDataSet();
    Region orderRegion = custRegion.getRegionService().getRegion("order");
    CacheTransactionManager mgr = CacheFactory.getAnyInstance().getCacheTransactionManager();
    CustomerId custToUpdate = (CustomerId)rfc.getFilter().iterator().next();
    OrderId orderToUpdate = (OrderId)rfc.getArguments();
    System.out.println("Starting a transaction...");
    mgr.begin();
    int randomInt = random.nextInt(1000);
    System.out.println("for customer region updating "+custToUpdate);
    custRegion.put(custToUpdate, "updatedCustomer_"+custToUpdate.getCustId()+"_"+randomInt);
    System.out.println("for order region updating "+orderToUpdate);
    orderRegion.put(orderToUpdate, "newOrder_"+orderToUpdate.getOrderId()+"_"+randomInt);
    mgr.commit();
    System.out.println("transaction completed");
    context.getResultSender().lastResult(Boolean.TRUE);
  }

  /* (non-Javadoc)
   * @see com.gemstone.gemfire.cache.execute.FunctionAdapter#getId()
   */
  @Override
  public String getId() {
    return "TxFuntion";
  }

}