/*
* Copyright (c) 2008-2017, Hazelcast, 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.
*/
package com.hazelcast.spi.impl.operationexecutor;
import com.hazelcast.spi.LiveOperations;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.impl.PacketHandler;
import com.hazelcast.spi.impl.PartitionSpecificRunnable;
import com.hazelcast.spi.impl.operationexecutor.impl.OperationExecutorImpl;
/**
* The OperationExecutor is responsible for scheduling work (packets/operations) to be executed. It can be compared
* to a {@link java.util.concurrent.Executor} with the big difference that it is designed for assigning packets,
* operations and PartitionSpecificRunnable to a thread instead of only runnables.
*
* It depends on the implementation if an operation is executed on the calling thread or not. For example the
* {@link OperationExecutorImpl} will always offload a partition specific
* Operation to the correct partition-operation-thread.
*
* The actual processing of a operation-packet, Operation, or a PartitionSpecificRunnable is forwarded to the
* {@link OperationRunner}.
*/
public interface OperationExecutor extends PacketHandler {
// Will be replaced by metrics
@Deprecated
int getRunningOperationCount();
// Will be replaced by metrics
@Deprecated
int getQueueSize();
// Will be replaced by metrics
@Deprecated
int getPriorityQueueSize();
/**
* Returns the number of executed operations.
*/
long getExecutedOperationCount();
/**
* Returns the number of partition threads.
*
* @return number of partition threads.
*/
int getPartitionThreadCount();
/**
* Returns the number of generic threads.
*
* @return number of generic threads.
*/
int getGenericThreadCount();
/**
* Gets all the operation handlers for the partitions. Each partition will have its own operation handler. So if
* there are 271 partitions, then the size of the array will be 271.
* <p/>
* Don't modify the content of the array!
*
* @return the operation handlers.
*/
OperationRunner[] getPartitionOperationRunners();
/**
* Gets all the generic operation handlers. The number of generic operation handlers depends on the number of
* generic threads.
* <p/>
* Don't modify the content of the array!
*
* @return the generic operation handlers.
*/
OperationRunner[] getGenericOperationRunners();
/**
* Executes the given {@link Operation} at some point in the future.
*
* @param op the operation to execute.
* @throws java.lang.NullPointerException if op is null.
*/
void execute(Operation op);
/**
* Executes the given {@link PartitionSpecificRunnable} at some point in the future.
*
* @param task the task the execute.
* @throws java.lang.NullPointerException if task is null.
*/
void execute(PartitionSpecificRunnable task);
/**
* Executes the task on every partition thread.
*
* @param task the task the execute.
* @throws java.lang.NullPointerException if task is null.
*/
void executeOnPartitionThreads(Runnable task);
/**
* Runs the {@link Operation} on the calling thread.
*
* @param op the {@link Operation} to run.
* @throws java.lang.NullPointerException if op is null.
* @throws IllegalThreadStateException if the operation is not allowed to be run on the calling thread.
*/
void run(Operation op);
/**
* Tries to run the {@link Operation} on the calling thread if allowed. Otherwise the operation is submitted for executing
* using {@link #execute(Operation)}.
*
* @param op the {@link Operation} to run or execute.
* @throws java.lang.NullPointerException if op is null.
*/
void runOrExecute(Operation op);
void scan(LiveOperations result);
/**
* Checks if the {@link Operation} is allowed to run on the current thread.
*
* @param op the {@link Operation} to check
* @return true if it is allowed, false otherwise.
* @throws java.lang.NullPointerException if op is null.
*/
boolean isRunAllowed(Operation op);
/**
* Checks if the {@link Operation} is allowed to be invoked from the current thread. Invoking means that the operation can
* be executed on another thread, but that one is going to block for completion using the future.get/join etc.
* Blocking for completion can cause problems, e.g. when you hog a partition thread or deadlocks.
*
* @param op the {@link Operation} to check
* @param isAsync is the invocation async, if false invocation does not return a future to block on
* @return true if allowed, false otherwise.
*/
boolean isInvocationAllowed(Operation op, boolean isAsync);
/**
* Checks if the current thread is an {@link Operation} thread.
*
* @return true if is an {@link Operation} thread, false otherwise.
*/
boolean isOperationThread();
/**
* Returns the id of the partitionThread assigned to handle partition with given partitionId
*
* @param partitionId given partitionId
* @return id of the partitionThread assigned to handle partition with given partitionId
*/
int getPartitionThreadId(int partitionId);
/**
* Interrupts the partition threads.
*/
void interruptPartitionThreads();
/**
* Starts this OperationExecutor
*/
void start();
/**
* Shuts down this OperationExecutor. Any pending tasks are discarded.
*/
void shutdown();
}