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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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 java.nio.ByteBuffer;

import org.apache.geode.cache.EntryNotFoundException;
import org.apache.geode.cache.RegionDestroyedException;
import org.apache.geode.cache.operations.InvalidateOperationContext;
import org.apache.geode.distributed.internal.DistributionStats;
import org.apache.geode.internal.cache.EventID;
import org.apache.geode.internal.cache.EventIDHolder;
import org.apache.geode.internal.cache.LocalRegion;
import org.apache.geode.internal.cache.PartitionedRegion;
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.cache.versions.VersionTag;
import org.apache.geode.internal.i18n.LocalizedStrings;
import org.apache.geode.internal.logging.log4j.LocalizedMessage;
import org.apache.geode.internal.security.AuthorizeRequest;
import org.apache.geode.internal.util.Breadcrumbs;
import org.apache.geode.security.GemFireSecurityException;

public class Invalidate extends BaseCommand {

  private final static Invalidate singleton = new Invalidate();

  public static Command getCommand() {
    return singleton;
  }

  @Override
  public void cmdExecute(Message msg, ServerConnection servConn, long start)
      throws IOException, InterruptedException {
    Part regionNamePart = null, keyPart = null, callbackArgPart = null;
    String regionName = null;
    Object callbackArg = null, key = null;
    Part eventPart = null;
    StringBuffer errMessage = new StringBuffer();
    CacheServerStats stats = servConn.getCacheServerStats();
    servConn.setAsTrue(REQUIRES_RESPONSE);

    {
      long oldStart = start;
      start = DistributionStats.getStatTime();
      stats.incReadInvalidateRequestTime(start - oldStart);
    }
    // Retrieve the data from the message parts
    regionNamePart = msg.getPart(0);
    keyPart = msg.getPart(1);
    eventPart = msg.getPart(2);
    // callbackArgPart = null; (redundant assignment)
    if (msg.getNumberOfParts() > 3) {
      callbackArgPart = msg.getPart(3);
      try {
        callbackArg = callbackArgPart.getObject();
      } catch (Exception e) {
        writeException(msg, e, false, servConn);
        servConn.setAsTrue(RESPONDED);
        return;
      }
    }
    regionName = regionNamePart.getString();
    try {
      key = keyPart.getStringOrObject();
    } catch (Exception e) {
      writeException(msg, e, false, servConn);
      servConn.setAsTrue(RESPONDED);
      return;
    }
    if (logger.isDebugEnabled()) {
      logger.debug(servConn.getName() + ": Received invalidate request (" + msg.getPayloadLength()
          + " bytes) from " + servConn.getSocketString() + " for region " + regionName + " key "
          + key);
    }

    // Process the invalidate request
    if (key == null || regionName == null) {
      if (key == null) {
        logger.warn(LocalizedMessage.create(
            LocalizedStrings.BaseCommand__THE_INPUT_KEY_FOR_THE_0_REQUEST_IS_NULL, "invalidate"));
        errMessage.append(LocalizedStrings.BaseCommand__THE_INPUT_KEY_FOR_THE_0_REQUEST_IS_NULL
            .toLocalizedString("invalidate"));
      }
      if (regionName == null) {
        logger.warn(LocalizedMessage.create(
            LocalizedStrings.BaseCommand__THE_INPUT_REGION_NAME_FOR_THE_0_REQUEST_IS_NULL,
            "invalidate"));
        errMessage
            .append(LocalizedStrings.BaseCommand__THE_INPUT_REGION_NAME_FOR_THE_0_REQUEST_IS_NULL
                .toLocalizedString("invalidate"));
      }
      writeErrorResponse(msg, MessageType.DESTROY_DATA_ERROR, errMessage.toString(), servConn);
      servConn.setAsTrue(RESPONDED);
      return;
    }
    LocalRegion region = (LocalRegion) servConn.getCache().getRegion(regionName);
    if (region == null) {
      String reason = LocalizedStrings.BaseCommand__0_WAS_NOT_FOUND_DURING_1_REQUEST
          .toLocalizedString(regionName, "invalidate");
      writeRegionDestroyedEx(msg, regionName, reason, servConn);
      servConn.setAsTrue(RESPONDED);
      return;
    }
    // Invalidate the entry
    ByteBuffer eventIdPartsBuffer = ByteBuffer.wrap(eventPart.getSerializedForm());
    long threadId = EventID.readEventIdPartsFromOptmizedByteArray(eventIdPartsBuffer);
    long sequenceId = EventID.readEventIdPartsFromOptmizedByteArray(eventIdPartsBuffer);
    EventID eventId = new EventID(servConn.getEventMemberIDByteArray(), threadId, sequenceId);

    Breadcrumbs.setEventId(eventId);

    VersionTag tag = null;

    try {
      // for integrated security
      this.securityService.authorizeRegionWrite(regionName, key.toString());

      AuthorizeRequest authzRequest = servConn.getAuthzRequest();
      if (authzRequest != null) {
        InvalidateOperationContext invalidateContext =
            authzRequest.invalidateAuthorize(regionName, key, callbackArg);
        callbackArg = invalidateContext.getCallbackArg();
      }
      EventIDHolder clientEvent = new EventIDHolder(eventId);

      // msg.isRetry might be set by v7.0 and later clients
      if (msg.isRetry()) {
        // if (logger.isDebugEnabled()) {
        // logger.debug("DEBUG: encountered isRetry in Invalidate");
        // }
        clientEvent.setPossibleDuplicate(true);
        if (region.getAttributes().getConcurrencyChecksEnabled()) {
          // recover the version tag from other servers
          clientEvent.setRegion(region);
          if (!recoverVersionTagForRetriedOperation(clientEvent)) {
            clientEvent.setPossibleDuplicate(false); // no-one has seen this event
          }
        }
      }

      region.basicBridgeInvalidate(key, callbackArg, servConn.getProxyID(), true, clientEvent);
      tag = clientEvent.getVersionTag();
      servConn.setModificationInfo(true, regionName, key);
    } catch (EntryNotFoundException e) {
      // Don't send an exception back to the client if this
      // exception happens. Just log it and continue.
      logger.info(LocalizedMessage.create(
          LocalizedStrings.BaseCommand_DURING_0_NO_ENTRY_WAS_FOUND_FOR_KEY_1,
          new Object[] {"invalidate", key}));
    } catch (RegionDestroyedException rde) {
      writeException(msg, rde, false, servConn);
      servConn.setAsTrue(RESPONDED);
      return;
    } catch (Exception e) {
      // If an interrupted exception is thrown , rethrow it
      checkForInterrupt(servConn, e);

      // If an exception occurs during the destroy, preserve the connection
      writeException(msg, e, false, servConn);
      servConn.setAsTrue(RESPONDED);
      if (e instanceof GemFireSecurityException) {
        // Fine logging for security exceptions since these are already
        // logged by the security logger
        if (logger.isDebugEnabled()) {
          logger.debug("{}: Unexpected Security exception", servConn.getName(), e);
        }
      } else {
        logger.warn(LocalizedMessage.create(LocalizedStrings.BaseCommand_0_UNEXPECTED_EXCEPTION,
            servConn.getName()), e);
      }
      return;
    }

    // Update the statistics and write the reply
    {
      long oldStart = start;
      start = DistributionStats.getStatTime();
      stats.incProcessInvalidateTime(start - oldStart);
    }
    if (region instanceof PartitionedRegion) {
      PartitionedRegion pr = (PartitionedRegion) region;
      if (pr.getNetworkHopType() != PartitionedRegion.NETWORK_HOP_NONE) {
        writeReplyWithRefreshMetadata(msg, servConn, pr, pr.getNetworkHopType(), tag);
        pr.clearNetworkHopData();
      } else {
        writeReply(msg, servConn, tag);
      }
    } else {
      writeReply(msg, servConn, tag);
    }
    servConn.setAsTrue(RESPONDED);
    if (logger.isDebugEnabled()) {
      logger.debug("{}: Sent invalidate response for region {} key {}", servConn.getName(),
          regionName, key);
    }
    stats.incWriteInvalidateResponseTime(DistributionStats.getStatTime() - start);
  }

  protected void writeReply(Message origMsg, ServerConnection servConn, VersionTag tag)
      throws IOException {
    writeReply(origMsg, servConn);
  }

  protected void writeReplyWithRefreshMetadata(Message origMsg, ServerConnection servConn,
      PartitionedRegion pr, byte nwHop, VersionTag tag) throws IOException {
    writeReplyWithRefreshMetadata(origMsg, servConn, pr, nwHop);
  }
}




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