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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 com.gemstone.gemfire.internal.cache;


import com.gemstone.gemfire.InternalGemFireError;
import com.gemstone.gemfire.internal.Assert;

/**
 * Indicates that the current non-partitioned region operation failed fatally.
 * 
 * @see com.gemstone.gemfire.internal.cache.RemoteOperationMessage
 * @author gregp
 * @since 6.5
 */
public class RemoteOperationException extends
    DataLocationException
{
  private static final long serialVersionUID = -595988965679204903L;
  /**
   * If true, this exception includes a hashCode for specified key
   */
  private boolean hasHash = false;
  
  /**
   * The hashCode for a specified key, if {@link #hasHash()} is true
   */
  private int keyHash = 0;
  
  /**
   * Used when constructing the error: sets the expected hash.
   * @param h the hash to use
   */
  public void setHash(int h) {
    Assert.assertTrue(!this.hasHash, "setHash already called");
    this.hasHash = true;
    this.keyHash = h;
  }
  
  /**
   * Fetch the hash for this exception
   * @return the expected hash
   */
  public boolean hasHash() {
    return this.hasHash;
  }
  
  public int getHash() {
    if (!hasHash) {
      throw new InternalGemFireError("getHash when no hash");
    }
    return this.keyHash;
  }
  
  /**
   * If possible, validate the given key's hashCode against any
   * that was returned by the peer.
   * @param key the key on the current host.  If null, no check is done.
   * @throws PartitionedRegionException if the keys disagree.
   */
  public void checkKey(Object key) throws PartitionedRegionException {
    if (!hasHash) {
      return; // none provided
    }
    if (key == null) {
      return; // ???
    }
    
    int expected = key.hashCode();
    if (expected == keyHash) {
      return;
    }
    throw new PartitionedRegionException(
        "Object hashCode inconsistent between cache peers. Here = " + 
        expected + "; peer calculated = " + keyHash);
  }
  
  /**
   * Reattempt required due to an underlying error
   * 
   * @param message describes the context
   * @param cause the underlying cause
   */
  public RemoteOperationException(String message, Throwable cause) {
    super(message, cause);
  }
  
  /**
   * Reattempt required due to detected condition
   * @param message describes the condition
   */
  public RemoteOperationException(String message) {
    super(message);
  }
  
  @Override
  public String toString() {
    String result = super.toString();
    if (hasHash()) {
      result = result + " (hash = " + keyHash + ")";
    }
    return result;
  }
}