/*
 * 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.tier.sockets.command;

import java.io.IOException;

import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.internal.cache.TXId;
import org.apache.geode.internal.cache.TXManagerImpl;
import org.apache.geode.internal.cache.TXStateProxy;
import org.apache.geode.internal.cache.tier.Command;
import org.apache.geode.internal.cache.tier.sockets.BaseCommand;
import org.apache.geode.internal.cache.tier.sockets.Message;
import org.apache.geode.internal.cache.tier.sockets.ServerConnection;

/**
 * Command for performing Rollback on the server
 */
public class RollbackCommand extends BaseCommand {

  private final static RollbackCommand singleton = new RollbackCommand();

  public static Command getCommand() {
    return singleton;
  }

  private RollbackCommand() {}

  @Override
  public void cmdExecute(Message msg, ServerConnection servConn, long start)
      throws IOException, ClassNotFoundException, InterruptedException {
    servConn.setAsTrue(REQUIRES_RESPONSE);
    TXManagerImpl txMgr = (TXManagerImpl) servConn.getCache().getCacheTransactionManager();
    InternalDistributedMember client =
        (InternalDistributedMember) servConn.getProxyID().getDistributedMember();
    int uniqId = msg.getTransactionId();
    TXId txId = new TXId(client, uniqId);
    if (txMgr.isHostedTxRecentlyCompleted(txId)) {
      if (logger.isDebugEnabled()) {
        logger.debug("TX: found a recently rolled back tx: {}", txId);
        sendRollbackReply(msg, servConn);
        txMgr.removeHostedTXState(txId);
        return;
      }
    }
    final TXStateProxy txState = txMgr.getTXState();
    try {
      if (txState != null) {
        txId = txState.getTxId();
        txMgr.rollback();
        sendRollbackReply(msg, servConn);
      } else {
        // could not find TxState in the host server.
        // Protect against a failover command received so late,
        // and it is removed from the failoverMap due to capacity.
        sendRollbackReply(msg, servConn);
      }
    } catch (Exception e) {
      writeException(msg, e, false, servConn);
      servConn.setAsTrue(RESPONDED);
    } finally {
      if (logger.isDebugEnabled()) {
        logger.debug("TX: removing tx state for {}", txId);
      }
      if (txId != null) {
        TXStateProxy proxy = txMgr.removeHostedTXState(txId);
        if (logger.isDebugEnabled()) {
          logger.debug("TX: removed tx state proxy {}", proxy);
        }
      }
    }
  }

  private void sendRollbackReply(Message msg, ServerConnection servConn) throws IOException {
    writeReply(msg, servConn);
    servConn.setAsTrue(RESPONDED);
  }

}