/*
 * 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.annotations.Immutable;
import org.apache.geode.distributed.internal.DistributionStats;
import org.apache.geode.internal.cache.LocalRegion;
import org.apache.geode.internal.cache.tier.Command;
import org.apache.geode.internal.cache.tier.MessageType;
import org.apache.geode.internal.cache.tier.sockets.BaseCommand;
import org.apache.geode.internal.cache.tier.sockets.CacheServerStats;
import org.apache.geode.internal.cache.tier.sockets.Message;
import org.apache.geode.internal.cache.tier.sockets.Part;
import org.apache.geode.internal.cache.tier.sockets.ServerConnection;
import org.apache.geode.internal.security.AuthorizeRequest;
import org.apache.geode.internal.security.SecurityService;
import org.apache.geode.security.NotAuthorizedException;
import org.apache.geode.security.ResourcePermission.Operation;
import org.apache.geode.security.ResourcePermission.Resource;

public class ContainsKey extends BaseCommand {

  @Immutable
  private static final ContainsKey singleton = new ContainsKey();

  public static Command getCommand() {
    return singleton;
  }

  private static void writeContainsKeyResponse(boolean containsKey, Message origMsg,
      ServerConnection servConn) throws IOException {
    Message responseMsg = servConn.getResponseMessage();
    responseMsg.setMessageType(MessageType.RESPONSE);
    responseMsg.setNumberOfParts(1);
    responseMsg.setTransactionId(origMsg.getTransactionId());
    responseMsg.addObjPart(containsKey ? Boolean.TRUE : Boolean.FALSE);
    responseMsg.send(servConn);
  }

  @Override
  public void cmdExecute(final Message clientMessage, final ServerConnection serverConnection,
      final SecurityService securityService, long start) throws IOException {
    Part regionNamePart = null;
    Part keyPart = null;
    String regionName = null;
    Object key = null;

    CacheServerStats stats = serverConnection.getCacheServerStats();

    serverConnection.setAsTrue(REQUIRES_RESPONSE);
    {
      long oldStart = start;
      start = DistributionStats.getStatTime();
      stats.incReadContainsKeyRequestTime(start - oldStart);
    }
    // Retrieve the data from the message parts
    regionNamePart = clientMessage.getPart(0);
    keyPart = clientMessage.getPart(1);
    regionName = regionNamePart.getCachedString();
    try {
      key = keyPart.getStringOrObject();
    } catch (Exception e) {
      writeException(clientMessage, e, false, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }
    if (logger.isDebugEnabled()) {
      logger.debug("{}: Received containsKey request ({} bytes) from {} for region {} key {}",
          serverConnection.getName(), clientMessage.getPayloadLength(),
          serverConnection.getSocketString(), regionName, key);
    }

    // Process the containsKey request
    if (key == null || regionName == null) {
      String errMessage = "";
      if (key == null) {
        logger.warn("{}: The input key for the containsKey request is null",
            serverConnection.getName());
        errMessage = "The input key for the containsKey request is null";
      }
      if (regionName == null) {
        logger.warn("{}: The input region name for the containsKey request is null",
            serverConnection.getName());
        errMessage =
            "The input region name for the containsKey request is null";
      }
      writeErrorResponse(clientMessage, MessageType.CONTAINS_KEY_DATA_ERROR, errMessage,
          serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }

    LocalRegion region = (LocalRegion) serverConnection.getCache().getRegion(regionName);
    if (region == null) {
      String reason =
          "was not found during containsKey request";
      writeRegionDestroyedEx(clientMessage, regionName, reason, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }

    try {
      securityService.authorize(Resource.DATA, Operation.READ, regionName, key);
    } catch (NotAuthorizedException ex) {
      writeException(clientMessage, ex, false, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }

    AuthorizeRequest authzRequest = serverConnection.getAuthzRequest();
    if (authzRequest != null) {
      try {
        authzRequest.containsKeyAuthorize(regionName, key);
      } catch (NotAuthorizedException ex) {
        writeException(clientMessage, ex, false, serverConnection);
        serverConnection.setAsTrue(RESPONDED);
        return;
      }
    }
    // Execute the containsKey
    boolean containsKey = region.containsKey(key);

    // Update the statistics and write the reply
    {
      long oldStart = start;
      start = DistributionStats.getStatTime();
      stats.incProcessContainsKeyTime(start - oldStart);
    }
    writeContainsKeyResponse(containsKey, clientMessage, serverConnection);
    serverConnection.setAsTrue(RESPONDED);
    if (logger.isDebugEnabled()) {
      logger.debug("{}: Sent containsKey response for region {} key {}", serverConnection.getName(),
          regionName, key);
    }
    stats.incWriteContainsKeyResponseTime(DistributionStats.getStatTime() - start);
  }

}