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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.partitioned;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Set;

import org.apache.logging.log4j.Logger;

import org.apache.geode.SystemFailure;
import org.apache.geode.distributed.internal.DistributionManager;
import org.apache.geode.distributed.internal.DistributionMessage;
import org.apache.geode.distributed.internal.InternalDistributedSystem;
import org.apache.geode.distributed.internal.MessageWithReply;
import org.apache.geode.distributed.internal.ReplyException;
import org.apache.geode.distributed.internal.ReplyMessage;
import org.apache.geode.distributed.internal.ReplyProcessor21;
import org.apache.geode.internal.Assert;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.internal.logging.log4j.LogMarker;


public final class IdentityUpdateMessage extends DistributionMessage implements MessageWithReply {
  private static final Logger logger = LogService.getLogger();

  private int processorId;

  private int newId;

  /**
   * Empty constructor to support DataSerializable instantiation
   */
  public IdentityUpdateMessage() {}

  public IdentityUpdateMessage(Set recipients, int processorId, int newId) {
    setRecipients(recipients);
    this.processorId = processorId;
    this.newId = newId;
  }

  @Override
  public int getProcessorType() {
    return DistributionManager.HIGH_PRIORITY_EXECUTOR;
  }

  @Override
  protected void process(DistributionManager dm) {
    try {
      if (logger.isTraceEnabled(LogMarker.DM)) {
        logger.trace(LogMarker.DM, "{}: processing message {}", getClass().getName(), this);
      }

      IdentityRequestMessage.setLatestId(this.newId);

      ReplyMessage.send(getSender(), getProcessorId(), null, dm);
    } catch (VirtualMachineError err) {
      SystemFailure.initiateFailure(err);
      // If this ever returns, rethrow the error. We're poisoned
      // now, so don't let this thread continue.
      throw err;
    } catch (Throwable t) {
      // Whenever you catch Error or Throwable, you must also
      // catch VirtualMachineError (see above). However, there is
      // _still_ a possibility that you are dealing with a cascading
      // error condition, so you also need to check to see if the JVM
      // is still usable:
      SystemFailure.checkFailure();
      logger.debug("{} Caught throwable {}", this, t.getMessage(), t);
    }
  }

  @Override
  public int getProcessorId() {
    return this.processorId;
  }

  public static IdentityUpdateResponse send(Set recipients, InternalDistributedSystem is,
      int currentPRId) {
    Assert.assertTrue(recipients != null, "IdentityUpdateMessage NULL recipients set");
    IdentityRequestMessage.setLatestId(currentPRId); // set local value
    IdentityUpdateResponse p = new IdentityUpdateResponse(is, recipients);
    IdentityUpdateMessage m =
        new IdentityUpdateMessage(recipients, p.getProcessorId(), currentPRId);
    is.getDistributionManager().putOutgoing(m); // set remote values
    return p;
  }


  public int getDSFID() {
    return PR_IDENTITY_UPDATE_MESSAGE;
  }

  @Override
  public void fromData(DataInput in) throws IOException, ClassNotFoundException {
    super.fromData(in);
    this.processorId = in.readInt();
    this.newId = in.readInt();
  }

  @Override
  public void toData(DataOutput out) throws IOException {
    super.toData(out);
    out.writeInt(this.processorId);
    out.writeInt(this.newId);
  }

  @Override
  public String toString() {
    return new StringBuffer().append(getClass().getName()).append("(sender=").append(getSender())
        .append("; processorId=").append(this.processorId).append("; newPRId=").append(this.newId)
        .append(")").toString();
  }

  /**
   * A processor that ignores exceptions, silently removing those nodes that reply with problems
   * 
   * @since GemFire 5.0
   */
  public static class IdentityUpdateResponse extends ReplyProcessor21 {

    public IdentityUpdateResponse(InternalDistributedSystem ds, Set recipients) {
      super(ds, recipients);
    }

    /**
     * The IdentityResponse processor ignores remote exceptions by implmenting this method. Ignoring
     * remote exceptions is acceptable since the response is only meant to wait for all healthy
     * recipients to receive their {@link IdentityUpdateMessage}
     */
    @Override
    protected synchronized void processException(ReplyException ex) {
      logger.debug("IdentityUpdateResponse ignoring exception {}", ex.getMessage(), ex);
    }
  }
}