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/**
* Copyright (c) 2016, All partners of the iTesla project (http://www.itesla-project.eu/consortium)
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
* SPDX-License-Identifier: MPL-2.0
*/
package com.powsybl.computation.util;
import java.util.concurrent.locks.ReentrantLock;
/**
*
* @author Geoffroy Jamgotchian {@literal }
*/
public abstract class AbstractExecutor {
private final ReentrantLock runLock = new ReentrantLock();
private boolean initialized = false;
private boolean shutdownRequested = false;
private int runCounter = 0;
protected void startInit() throws Exception {
runLock.lock();
try {
if (initialized) {
throw new IllegalStateException("Module is already initialized");
}
} finally {
runLock.unlock();
}
}
protected void endInit() throws Exception {
runLock.lock();
try {
initialized = true;
} finally {
runLock.unlock();
}
}
protected abstract void clean() throws Exception;
protected void startRun() throws Exception {
runLock.lock();
try {
if (!initialized) {
throw new IllegalStateException("Module is not initialized");
}
if (shutdownRequested) {
throw new IllegalStateException("Module has been shutdown");
}
runCounter++;
} finally {
runLock.unlock();
}
}
protected void endRun() throws Exception {
runLock.lock();
try {
runCounter--;
if (shutdownRequested && runCounter == 0) {
clean();
}
} finally {
runLock.unlock();
}
}
public void close() throws Exception {
runLock.lock();
try {
shutdownRequested = true;
if (runCounter == 0) {
clean();
}
} finally {
runLock.unlock();
}
}
}