ReconfigurableProtocolCommand.java

/*
 * INESC-ID, Instituto de Engenharia de Sistemas e Computadores Investigação e Desevolvimento em Lisboa
 * Copyright 2013 INESC-ID and/or its affiliates and other
 * contributors as indicated by the @author tags. All rights reserved.
 * See the copyright.txt in the distribution for a full listing of
 * individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3.0 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.infinispan.commands.remote;

import org.infinispan.context.InvocationContext;
import org.infinispan.reconfigurableprotocol.manager.ReconfigurableReplicationManager;

import java.util.concurrent.CountDownLatch;

/**
 * Command use when switch between protocol to broadcast data between all members
 *
 * @author Pedro Ruivo
 * @since 5.2
 */
public class ReconfigurableProtocolCommand extends BaseRpcCommand {

   public static final byte COMMAND_ID = 104;

   public static enum Type {
      SWITCH(false, true),
      REGISTER(false),
      DATA(true),
      SWITCH_REQ(false, true),
      SET_COOL_DOWN_TIME(true);

      final boolean hasData;
      final boolean hasBoolean;

      Type(boolean hasData, boolean hasBoolean) {
         this.hasData = hasData;
         this.hasBoolean = hasBoolean;
      }

      Type(boolean hasData) {
         this.hasData = hasData;
         this.hasBoolean = false;
      }
   }

   private ReconfigurableReplicationManager manager;

   private Type type;
   private String protocolId;
   private Object data;
   private boolean forceStop;
   private boolean abortOnStop;

   public ReconfigurableProtocolCommand(String cacheName, Type type, String protocolId) {
      super(cacheName);
      this.type = type;
      this.protocolId = protocolId;
   }

   public ReconfigurableProtocolCommand(String cacheName) {
      super(cacheName);
   }

   public final void init(ReconfigurableReplicationManager manager) {
      this.manager = manager;
   }

   @Override
   public final Object perform(InvocationContext ctx) throws Throwable {
      switch (type) {
         case SWITCH:
            CountDownLatch notifier = new CountDownLatch(1);
            manager.startSwitchTask(protocolId, forceStop, abortOnStop, notifier);
            notifier.await();
            break;
         case REGISTER:
            manager.internalRegister(protocolId);
            break;
         case DATA:
            manager.handleProtocolData(protocolId, data, getOrigin());
            break;
         case SWITCH_REQ:
            manager.switchTo(protocolId, forceStop, abortOnStop);
            break;
         case SET_COOL_DOWN_TIME:
            manager.internalSetSwitchCoolDownTime((Integer) data);
            break;
         default:
            break;
      }
      return null;
   }

   @Override
   public final byte getCommandId() {
      return COMMAND_ID;
   }

   @Override
   public final Object[] getParameters() {
      if (type.hasData) {
         return new Object[] {(byte)type.ordinal(), protocolId, data};
      } if (type.hasBoolean) {
         byte bool = (byte) (forceStop ? 1 : 0);
         bool |= abortOnStop ? 1 << 1 : 0;
         return new Object[] {(byte)type.ordinal(), protocolId, bool};
      } else {
         return new Object[] {(byte)type.ordinal(), protocolId};
      }
   }

   @Override
   public final void setParameters(int commandId, Object[] parameters) {
      this.type = Type.values()[(Byte) parameters[0]];
      this.protocolId = (String) parameters[1];
      if (type.hasData) {
         data = parameters[2];
      } else if (type.hasBoolean) {
         byte bool = (Byte) parameters[2];
         forceStop =  (bool & 1) != 0;
         abortOnStop = (bool & 1 << 1) != 0;
      }
   }

   @Override
   public final boolean isReturnValueExpected() {
      return false;
   }

   public final void setData(Object data) {
      this.data = data;
   }

   public final void setForceStop(boolean forceStop) {
      this.forceStop = forceStop;
   }

   public final void setAbortOnStop(boolean abortOnStop) {
      this.abortOnStop = abortOnStop;
   }

   @Override
   public String toString() {
      return String.format("ReconfigurableProtocolCommand{type=%s, protocolId='%s', data=%s, forceStop=%s, abortOnStop=%s}"
            , type, protocolId, data, forceStop, abortOnStop);
   }
}