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/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* Licensed 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. See accompanying
* LICENSE file.
*/
/**
*
*/
package com.gemstone.gemfire.internal.cache.tier.sockets.command;
import java.io.IOException;
import java.util.Collections;
import java.util.Set;
import com.gemstone.gemfire.cache.LowMemoryException;
import com.gemstone.gemfire.cache.execute.Function;
import com.gemstone.gemfire.cache.execute.FunctionContext;
import com.gemstone.gemfire.cache.execute.FunctionException;
import com.gemstone.gemfire.cache.execute.FunctionService;
import com.gemstone.gemfire.cache.execute.ResultSender;
import com.gemstone.gemfire.cache.operations.ExecuteFunctionOperationContext;
import com.gemstone.gemfire.distributed.DistributedMember;
import com.gemstone.gemfire.distributed.internal.InternalDistributedSystem;
import com.gemstone.gemfire.distributed.internal.membership.InternalDistributedMember;
import com.gemstone.gemfire.internal.cache.GemFireCacheImpl;
import com.gemstone.gemfire.internal.cache.control.HeapMemoryMonitor;
import com.gemstone.gemfire.internal.cache.control.InternalResourceManager;
import com.gemstone.gemfire.internal.cache.control.MemoryThresholds;
import com.gemstone.gemfire.internal.cache.execute.FunctionContextImpl;
import com.gemstone.gemfire.internal.cache.execute.FunctionStats;
import com.gemstone.gemfire.internal.cache.execute.MemberMappedArgument;
import com.gemstone.gemfire.internal.cache.execute.ServerToClientFunctionResultSender;
import com.gemstone.gemfire.internal.cache.tier.Command;
import com.gemstone.gemfire.internal.cache.tier.MessageType;
import com.gemstone.gemfire.internal.cache.tier.sockets.BaseCommand;
import com.gemstone.gemfire.internal.cache.tier.sockets.ChunkedMessage;
import com.gemstone.gemfire.internal.cache.tier.sockets.HandShake;
import com.gemstone.gemfire.internal.cache.tier.sockets.Message;
import com.gemstone.gemfire.internal.cache.tier.sockets.Part;
import com.gemstone.gemfire.internal.cache.tier.sockets.ServerConnection;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
import com.gemstone.gemfire.internal.security.AuthorizeRequest;
/**
* This is the base command which read the parts for the
* MessageType.EXECUTE_FUNCTION.
* If the hasResult byte is 1, then this command send back the result after the
* execution to the client else do not send the reply back to the client
*
* @author Kishor Bachhav
* @since 5.8Beta
*/
public class ExecuteFunction extends BaseCommand {
private final static ExecuteFunction singleton = new ExecuteFunction();
public static Command getCommand() {
return singleton;
}
private ExecuteFunction() {
}
@Override
public void cmdExecute(Message msg, ServerConnection servConn, long start)
throws IOException {
Object function = null;
Object args = null;
MemberMappedArgument memberMappedArg = null;
byte hasResult = 0;
try {
hasResult = msg.getPart(0).getSerializedForm()[0];
if (hasResult == 1) {
servConn.setAsTrue(REQUIRES_RESPONSE);
servConn.setAsTrue(REQUIRES_CHUNKED_RESPONSE);
}
function = msg.getPart(1).getStringOrObject();
args = msg.getPart(2).getObject();
Part part = msg.getPart(3);
if (part != null) {
memberMappedArg = (MemberMappedArgument)part.getObject();
}
}
catch (ClassNotFoundException exception) {
if (logger.warningEnabled()) {
logger.warning(LocalizedStrings.
ExecuteFunction_EXCEPTION_ON_SERVER_WHILE_EXECUTIONG_FUNCTION_0,
function, exception);
}
if (hasResult == 1) {
writeChunkedException(msg, exception, false, servConn);
servConn.setAsTrue(RESPONDED);
return;
}
}
if (function == null) {
final String message =
LocalizedStrings.ExecuteFunction_THE_INPUT_FUNCTION_FOR_THE_EXECUTE_FUNCTION_REQUEST_IS_NULL
.toLocalizedString();
if (logger.warningEnabled())
logger.warning(LocalizedStrings.TWO_ARG_COLON,
new Object[] {servConn.getName(), message});
sendError(hasResult, msg, message, servConn);
return;
}
else {
// Execute function on the cache
try {
Function functionObject = null;
if (function instanceof String) {
functionObject = FunctionService.getFunction((String)function);
if (functionObject == null) {
final String message =
LocalizedStrings.ExecuteFunction_FUNCTION_NAMED_0_IS_NOT_REGISTERED
.toLocalizedString(function);
if (logger.warningEnabled()) {
logger.warning(LocalizedStrings.TWO_ARG_COLON,
new Object[] {servConn.getName(), message});
}
sendError(hasResult, msg, message, servConn);
return;
}
}
else {
functionObject = (Function)function;
}
FunctionStats stats = FunctionStats.getFunctionStats(functionObject.getId(), null);
// check if the caller is authorized to do this operation on server
AuthorizeRequest authzRequest = servConn.getAuthzRequest();
ExecuteFunctionOperationContext executeContext = null;
if (authzRequest != null) {
executeContext = authzRequest.executeFunctionAuthorize(functionObject
.getId(), null, null, functionObject.optimizeForWrite());
}
ChunkedMessage m = servConn.getFunctionResponseMessage();
m.setTransactionId(msg.getTransactionId());
ResultSender resultSender = new ServerToClientFunctionResultSender(m,
MessageType.EXECUTE_FUNCTION_RESULT, servConn, functionObject, executeContext);
InternalDistributedMember localVM = InternalDistributedSystem
.getAnyInstance().getDistributedMember();
FunctionContext context = null;
if (memberMappedArg != null) {
context = new FunctionContextImpl(functionObject.getId(),
memberMappedArg.getArgumentsForMember(localVM.getId()),
resultSender);
}
else {
context = new FunctionContextImpl(functionObject.getId(), args,
resultSender);
}
HandShake handShake = (HandShake)servConn.getHandshake();
int earlierClientReadTimeout = handShake.getClientReadTimeout();
handShake.setClientReadTimeout(0);
try {
// flush any pending ops in TX
ServerToClientFunctionResultSender.flushTXPendingOps();
long startExecution = stats.startTime();
stats.startFunctionExecution(functionObject.hasResult());
if(logger.fineEnabled()){
logger.fine("Executing Function on Server: " + servConn.toString() + "with context :" + context.toString());
}
GemFireCacheImpl cache = GemFireCacheImpl.getInstance();
HeapMemoryMonitor hmm = ((InternalResourceManager) cache.getResourceManager()).getHeapMonitor();
if (functionObject.optimizeForWrite() && cache != null &&
hmm.getState().isCritical() &&
!MemoryThresholds.isLowMemoryExceptionDisabled()) {
Set sm = Collections
. singleton(cache.getMyId());
throw new LowMemoryException(LocalizedStrings.ResourceManager_LOW_MEMORY_FOR_0_FUNCEXEC_MEMBERS_1
.toLocalizedString(new Object[] {functionObject.getId(), sm}), sm);
}
functionObject.execute(context);
stats.endFunctionExecution(startExecution,
functionObject.hasResult());
}
catch (FunctionException functionException) {
stats.endFunctionExecutionWithException(functionObject.hasResult());
throw functionException;
}
catch (Exception exception) {
stats.endFunctionExecutionWithException(functionObject.hasResult());
throw new FunctionException(exception);
}
finally{
handShake.setClientReadTimeout(earlierClientReadTimeout);
}
}
catch (IOException ioException) {
if (logger.warningEnabled()) {
logger.warning(LocalizedStrings.
ExecuteFunction_EXCEPTION_ON_SERVER_WHILE_EXECUTIONG_FUNCTION_0,
function, ioException);
}
String message = LocalizedStrings.ExecuteFunction_SERVER_COULD_NOT_SEND_THE_REPLY.toLocalizedString();
sendException(hasResult, msg, message, servConn,ioException);
}
catch (Exception e) {
if (logger.warningEnabled()) {
logger.warning(LocalizedStrings.
ExecuteFunction_EXCEPTION_ON_SERVER_WHILE_EXECUTIONG_FUNCTION_0,
function, e);
}
final String message = e.getMessage();
sendException(hasResult, msg, message, servConn,e);
}
}
}
private void sendException(byte hasResult, Message msg, String message,
ServerConnection servConn, Throwable e) throws IOException {
if (hasResult == 1) {
writeFunctionResponseException(msg, MessageType.EXCEPTION,
message, servConn, e);
servConn.setAsTrue(RESPONDED);
}
}
private void sendError(byte hasResult, Message msg, String message,
ServerConnection servConn) throws IOException {
if (hasResult == 1) {
writeFunctionResponseError(msg, MessageType.EXECUTE_FUNCTION_ERROR,
message, servConn);
servConn.setAsTrue(RESPONDED);
}
}
}