/*
 * 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.cache.client.internal;

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.apache.logging.log4j.Logger;

import org.apache.geode.InternalGemFireError;
import org.apache.geode.cache.execute.Function;
import org.apache.geode.cache.execute.FunctionException;
import org.apache.geode.distributed.internal.ServerLocation;
import org.apache.geode.internal.cache.execute.AbstractExecution;
import org.apache.geode.internal.cache.execute.MemberMappedArgument;
import org.apache.geode.internal.cache.tier.MessageType;
import org.apache.geode.internal.cache.tier.sockets.Message;
import org.apache.geode.internal.cache.tier.sockets.Part;
import org.apache.geode.internal.serialization.Version;
import org.apache.geode.logging.internal.log4j.api.LogService;

/**
 * Does a Execution of function on server (possibly without region/cache) It does not get the resulf
 * from the server (follows Fire&Forget approch)
 *
 * @since GemFire 5.8Beta
 */
public class ExecuteFunctionNoAckOp {

  private static final Logger logger = LogService.getLogger();

  private ExecuteFunctionNoAckOp() {
    // no instances allowed
  }

  /**
   * Does a execute Function on a server using connections from the given pool to communicate with
   * the server.
   *
   * @param pool the pool to use to communicate with the server.
   * @param function of the function to be executed
   * @param args specified arguments to the application function
   */
  public static void execute(PoolImpl pool, Function function, Object args,
      MemberMappedArgument memberMappedArg, boolean allServers, byte hasResult,
      boolean isFnSerializationReqd, String[] groups) {
    List servers = null;
    AbstractOp op = new ExecuteFunctionNoAckOpImpl(function, args, memberMappedArg, hasResult,
        isFnSerializationReqd, groups, allServers);
    try {
      // In case of allServers getCurrentServers and call
      // executeOn(ServerLocation server, Op op)
      if (allServers && groups.length == 0) {
        if (logger.isDebugEnabled()) {
          logger.debug("ExecuteFunctionNoAckOp#execute : Sending Function Execution Message:"
              + op.getMessage() + " to all servers using pool: " + pool);
        }
        servers = pool.getConnectionSource().getAllServers();
        Iterator i = servers.iterator();
        while (i.hasNext()) {
          pool.executeOn((ServerLocation) i.next(), op);
        }
      } else {
        if (logger.isDebugEnabled()) {
          logger.debug("ExecuteFunctionNoAckOp#execute : Sending Function Execution Message:"
              + op.getMessage() + " to server using pool: " + pool + " with groups:"
              + Arrays.toString(groups) + " all members:" + allServers);
        }
        pool.execute(op, 0);
      }
    } catch (Exception ex) {
      if (logger.isDebugEnabled()) {
        logger.debug(
            "ExecuteFunctionNoAckOp#execute : Exception occurred while Sending Function Execution Message:"
                + op.getMessage() + " to server using pool: " + pool,
            ex);
      }
      if (ex.getMessage() != null)
        throw new FunctionException(ex.getMessage(), ex);
      else
        throw new FunctionException("Unexpected exception during function execution:", ex);
    }
  }

  public static void execute(PoolImpl pool, String functionId, Object args,
      MemberMappedArgument memberMappedArg, boolean allServers, byte hasResult,
      boolean isFnSerializationReqd, boolean isHA, boolean optimizeForWrite, String[] groups) {
    List servers = null;
    AbstractOp op = new ExecuteFunctionNoAckOpImpl(functionId, args, memberMappedArg, hasResult,
        isFnSerializationReqd, isHA, optimizeForWrite, groups, allServers);
    try {
      // In case of allServers getCurrentServers and call
      // executeOn(ServerLocation server, Op op)
      if (allServers && groups.length == 0) {
        if (logger.isDebugEnabled()) {
          logger.debug("ExecuteFunctionNoAckOp#execute : Sending Function Execution Message:"
              + op.getMessage() + " to all servers using pool: " + pool);
        }
        servers = pool.getConnectionSource().getAllServers();
        Iterator i = servers.iterator();
        while (i.hasNext()) {
          pool.executeOn((ServerLocation) i.next(), op);
        }
      } else {
        if (logger.isDebugEnabled()) {
          logger.debug("ExecuteFunctionNoAckOp#execute : Sending Function Execution Message:"
              + op.getMessage() + " to server using pool: " + pool + " with groups:"
              + Arrays.toString(groups) + " all members:" + allServers);
        }
        pool.execute(op, 0);
      }
    } catch (Exception ex) {
      if (logger.isDebugEnabled()) {
        logger.debug(
            "ExecuteFunctionNoAckOp#execute : Exception occurred while Sending Function Execution Message:"
                + op.getMessage() + " to server using pool: " + pool,
            ex);
      }
      if (ex.getMessage() != null)
        throw new FunctionException(ex.getMessage(), ex);
      else
        throw new FunctionException("Unexpected exception during function execution:", ex);
    }
  }

  private static class ExecuteFunctionNoAckOpImpl extends AbstractOp {

    /**
     * number of parts in the request message
     */
    private static final int MSG_PARTS = 6;

    /**
     * @throws org.apache.geode.SerializationException if serialization fails
     */
    public ExecuteFunctionNoAckOpImpl(Function function, Object args,
        MemberMappedArgument memberMappedArg, byte hasResult, boolean isFnSerializationReqd,
        String[] groups, boolean allMembers) {
      super(MessageType.EXECUTE_FUNCTION, MSG_PARTS);
      byte functionState = AbstractExecution.getFunctionState(function.isHA(), function.hasResult(),
          function.optimizeForWrite());
      getMessage().addBytesPart(new byte[] {functionState});
      if (isFnSerializationReqd) {
        getMessage().addStringOrObjPart(function);
      } else {
        getMessage().addStringOrObjPart(function.getId());
      }
      getMessage().addObjPart(args);
      getMessage().addObjPart(memberMappedArg);
      getMessage().addObjPart(groups);
      getMessage().addBytesPart(ExecuteFunctionOp.getByteArrayForFlags(allMembers));
    }

    public ExecuteFunctionNoAckOpImpl(String functionId, Object args,
        MemberMappedArgument memberMappedArg, byte hasResult, boolean isFnSerializationReqd,
        boolean isHA, boolean optimizeForWrite, String[] groups, boolean allMembers) {
      super(MessageType.EXECUTE_FUNCTION, MSG_PARTS);
      getMessage().addBytesPart(new byte[] {AbstractExecution.getFunctionState(isHA,
          hasResult == (byte) 1 ? true : false, optimizeForWrite)});
      getMessage().addStringOrObjPart(functionId);
      getMessage().addObjPart(args);
      getMessage().addObjPart(memberMappedArg);
      getMessage().addObjPart(groups);
      getMessage().addBytesPart(ExecuteFunctionOp.getByteArrayForFlags(allMembers));
    }

    @Override
    protected Object processResponse(Message msg) throws Exception {
      final int msgType = msg.getMessageType();
      if (msgType == MessageType.REPLY) {
        return null;
      } else {
        Part part = msg.getPart(0);
        if (msgType == MessageType.EXCEPTION) {
          Throwable t = (Throwable) part.getObject();
          logger.warn("Function execution without result encountered an Exception on server.", t);
        } else if (isErrorResponse(msgType)) {
          logger.warn("Function execution without result encountered an Exception on server.");
        } else {
          throw new InternalGemFireError(
              "Unexpected message type " + MessageType.getString(msgType));
        }
        return null;
      }
    }

    @Override
    protected boolean isErrorResponse(int msgType) {
      return msgType == MessageType.EXECUTE_FUNCTION_ERROR;
    }

    @Override
    protected long startAttempt(ConnectionStats stats) {
      return stats.startExecuteFunction();
    }

    @Override
    protected void endSendAttempt(ConnectionStats stats, long start) {
      stats.endExecuteFunctionSend(start, hasFailed());
    }

    @Override
    protected void endAttempt(ConnectionStats stats, long start) {
      stats.endExecuteFunction(start, hasTimedOut(), hasFailed());
    }

    @Override
    protected Message createResponseMessage() {
      return new Message(1, Version.CURRENT);
    }
  }
}