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Javet is Java + V8 (JAVa + V + EighT). It is an awesome way of embedding Node.js and V8 in Java.
/*
* Copyright (c) 2021-2022. caoccao.com Sam Cao
*
* 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.caoccao.javet.interop.engine;
import com.caoccao.javet.enums.JSRuntimeType;
import com.caoccao.javet.exceptions.JavetError;
import com.caoccao.javet.exceptions.JavetException;
import com.caoccao.javet.interfaces.IJavetLogger;
import com.caoccao.javet.interop.V8Host;
import com.caoccao.javet.interop.V8Runtime;
import com.caoccao.javet.interop.engine.observers.IV8RuntimeObserver;
import com.caoccao.javet.interop.monitoring.V8SharedMemoryStatistics;
import com.caoccao.javet.interop.options.RuntimeOptions;
import com.caoccao.javet.interop.options.V8RuntimeOptions;
import com.caoccao.javet.utils.JavetDateTimeUtils;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
import java.util.Objects;
import java.util.Random;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
/**
* The type Javet engine pool.
*
* @param the type parameter
* @since 0.8.0
*/
public class JavetEnginePool implements IJavetEnginePool, Runnable {
/**
* The constant JAVET_DAEMON_THREAD_NAME.
*
* @since 0.8.10
*/
protected static final String JAVET_DAEMON_THREAD_NAME = "Javet Daemon";
/**
* The External lock.
*
* @since 0.8.10
*/
protected final Object externalLock;
/**
* The Idle engine index list.
*
* @since 1.0.5
*/
protected final ConcurrentLinkedQueue idleEngineIndexList;
/**
* The Internal lock.
*
* @since 1.0.5
*/
protected final Object internalLock;
/**
* The Released engine index list.
*
* @since 1.0.5
*/
protected final ConcurrentLinkedQueue releasedEngineIndexList;
/**
* The Active.
*
* @since 0.7.0
*/
protected volatile boolean active;
/**
* The Config.
*
* @since 0.7.0
*/
protected JavetEngineConfig config;
/**
* The Daemon thread.
*
* @since 0.7.0
*/
protected Thread daemonThread;
/**
* The Engines.
*
* @since 1.0.5
*/
protected JavetEngine[] engines;
/**
* The Quitting.
*
* @since 0.7.0
*/
protected volatile boolean quitting;
/**
* The Random.
*
* @since 1.0.5
*/
protected Random random;
/**
* The Semaphore.
*
* @since 1.1.6
*/
protected Semaphore semaphore;
/**
* Instantiates a new Javet engine pool.
*
* @since 0.7.0
*/
public JavetEnginePool() {
this(new JavetEngineConfig());
}
/**
* Instantiates a new Javet engine pool.
*
* @param config the config
* @since 0.7.0
*/
@SuppressWarnings("unchecked")
public JavetEnginePool(JavetEngineConfig config) {
this.config = Objects.requireNonNull(config).freezePoolSize();
idleEngineIndexList = new ConcurrentLinkedQueue<>();
releasedEngineIndexList = new ConcurrentLinkedQueue<>();
engines = new JavetEngine[config.getPoolMaxSize()];
externalLock = new Object();
internalLock = new Object();
active = false;
quitting = false;
random = new Random();
semaphore = null;
startDaemon();
}
@Override
public void close() throws JavetException {
stopDaemon();
}
/**
* Create engine javet engine.
*
* @return the javet engine
* @throws JavetException the javet exception
* @since 0.7.0
*/
protected JavetEngine createEngine() throws JavetException {
JSRuntimeType jsRuntimeType = config.getJSRuntimeType();
RuntimeOptions runtimeOptions = jsRuntimeType.getRuntimeOptions();
if (runtimeOptions instanceof V8RuntimeOptions) {
V8RuntimeOptions v8RuntimeOptions = (V8RuntimeOptions) runtimeOptions;
v8RuntimeOptions.setGlobalName(config.getGlobalName());
}
@SuppressWarnings("ConstantConditions")
R v8Runtime = V8Host.getInstance(jsRuntimeType).createV8Runtime(true, runtimeOptions);
v8Runtime.allowEval(config.isAllowEval());
v8Runtime.setLogger(config.getJavetLogger());
return new JavetEngine<>(this, v8Runtime);
}
@Override
public int getActiveEngineCount() {
return engines.length - getIdleEngineCount() - getReleasedEngineCount();
}
@Override
public JavetEngineConfig getConfig() {
return config;
}
@Override
public IJavetEngine getEngine() throws JavetException {
IJavetLogger logger = config.getJavetLogger();
logger.debug("JavetEnginePool.getEngine() begins.");
JavetEngine engine = null;
long startTime = System.currentTimeMillis();
long lastTime = startTime;
int retryCount = 0;
while (!quitting) {
if (semaphore.tryAcquire()) {
try {
Integer index = idleEngineIndexList.poll();
if (index == null) {
index = releasedEngineIndexList.poll();
if (index != null) {
engine = createEngine();
engine.setIndex(index);
engines[index] = engine;
break;
}
} else {
engine = engines[index];
if (engine == null) {
logger.error("Idle engine cannot be null.");
engine = createEngine();
engine.setIndex(index);
engines[index] = engine;
}
break;
}
semaphore.release();
} catch (Throwable t) {
logger.logError(t, "Failed to create a new engine.");
}
}
++retryCount;
if (retryCount >= config.getWaitForEngineMaxRetryCount()) {
logger.logError("Failed to get an engine after {0} tries in {1}ms.",
config.getWaitForEngineMaxRetryCount(),
Long.toString(System.currentTimeMillis() - startTime));
throw new JavetException(JavetError.EngineNotAvailable);
}
try {
TimeUnit.MILLISECONDS.sleep(
config.getWaitForEngineSleepIntervalMillis()[
random.nextInt(config.getWaitForEngineSleepIntervalMillis().length)]);
long currentTime = System.currentTimeMillis();
if (currentTime - lastTime >= config.getWaitForEngineLogIntervalMillis()) {
logger.logWarn(
"{0}ms passed while waiting for an idle engine.",
Long.toString(currentTime - startTime));
lastTime = currentTime;
}
} catch (Throwable t) {
logger.logError(t, "Failed to sleep a while to wait for an idle engine.");
}
}
Objects.requireNonNull(engine).setActive(true);
JavetEngineUsage usage = engine.getUsage();
usage.increaseUsedCount();
logger.debug("JavetEnginePool.getEngine() ends.");
return engine;
}
@Override
public int getIdleEngineCount() {
return idleEngineIndexList.size();
}
@Override
public int getReleasedEngineCount() {
return releasedEngineIndexList.size();
}
/**
* Gets utc now.
*
* @return the utc now
* @since 0.7.0
*/
protected ZonedDateTime getUTCNow() {
return JavetDateTimeUtils.getUTCNow();
}
@Override
public V8SharedMemoryStatistics getV8SharedMemoryStatistics() {
return V8Host.getInstance(config.getJSRuntimeType()).getV8SharedMemoryStatistics();
}
@Override
public boolean isActive() {
return active;
}
@Override
public boolean isClosed() {
return !active;
}
@Override
public boolean isQuitting() {
return quitting;
}
@Override
public int observe(IV8RuntimeObserver... observers) {
int processedCount = 0;
if (observers.length > 0) {
synchronized (internalLock) {
IJavetLogger logger = config.getJavetLogger();
for (JavetEngine engine : engines) {
if (engine != null) {
boolean isContinuable = true;
for (IV8RuntimeObserver observer : observers) {
if (!engine.v8Runtime.isClosed()) {
try {
isContinuable = observer.observe(engine.v8Runtime);
} catch (Throwable t) {
logger.error(t.getMessage(), t);
} finally {
++processedCount;
}
if (!isContinuable) {
break;
}
}
}
if (!isContinuable) {
break;
}
}
}
}
}
return processedCount;
}
@Override
public void releaseEngine(IJavetEngine iJavetEngine) {
IJavetLogger logger = config.getJavetLogger();
logger.debug("JavetEnginePool.releaseEngine() begins.");
JavetEngine engine = (JavetEngine) Objects.requireNonNull(iJavetEngine);
engine.setActive(false);
if (config.isAutoSendGCNotification()) {
engine.sendGCNotification();
}
idleEngineIndexList.add(engine.getIndex());
semaphore.release();
wakeUpDaemon();
logger.debug("JavetEnginePool.releaseEngine() ends.");
}
@Override
public void run() {
IJavetLogger logger = config.getJavetLogger();
logger.debug("JavetEnginePool.run() begins.");
while (!quitting) {
synchronized (internalLock) {
final int initialIdleEngineCount = idleEngineIndexList.size();
for (int i = config.getPoolMinSize(); i < initialIdleEngineCount; ++i) {
final int immediateIdleEngineCount = idleEngineIndexList.size();
Integer index = idleEngineIndexList.poll();
if (index == null) {
break;
}
JavetEngine engine = Objects.requireNonNull(engines[index], "The idle engine must not be null.");
JavetEngineUsage usage = engine.getUsage();
ZonedDateTime expirationZonedDateTime = usage.getLastActiveZonedDatetime()
.plus(config.getPoolIdleTimeoutSeconds(), ChronoUnit.SECONDS);
if (immediateIdleEngineCount > engines.length
|| expirationZonedDateTime.isBefore(getUTCNow())) {
try {
engine.close(true);
} catch (Throwable t) {
logger.logError(t, "Failed to release idle engine.");
} finally {
engines[index] = null;
releasedEngineIndexList.add(index);
}
} else {
if (config.getResetEngineTimeoutSeconds() > 0) {
ZonedDateTime resetEngineZonedDateTime = usage.getLastActiveZonedDatetime()
.plus(config.getResetEngineTimeoutSeconds(), ChronoUnit.SECONDS);
if (resetEngineZonedDateTime.isBefore(getUTCNow())) {
try {
logger.debug("JavetEnginePool reset engine begins.");
engine.resetContext();
logger.debug("JavetEnginePool reset engine ends.");
} catch (Throwable t) {
logger.logError(t, "Failed to reset idle engine.");
}
}
}
idleEngineIndexList.add(index);
}
}
}
synchronized (externalLock) {
try {
externalLock.wait(config.getPoolDaemonCheckIntervalMillis());
} catch (InterruptedException e) {
logger.logError(e,
"Failed to sleep a while to wait for next round in Javet engine pool daemon.");
}
}
}
logger.logDebug(
"JavetEnginePool daemon is quitting with {0}/{1}/{2} engines.",
Integer.toString(getActiveEngineCount()),
Integer.toString(getIdleEngineCount()),
Integer.toString(engines.length));
synchronized (internalLock) {
Set idleEngineIndexSet = new TreeSet<>(idleEngineIndexList);
Set releasedEngineIndexSet = new TreeSet<>(releasedEngineIndexList);
for (int index = 0; index < engines.length; ++index) {
JavetEngine engine = engines[index];
if (engine != null) {
try {
if (engine.isActive()) {
try {
engine.getV8Runtime().terminateExecution();
} catch (Throwable t) {
logger.logError(t, "Failed to terminate active engine.");
}
}
engine.close(true);
} catch (Throwable t) {
logger.logError(t, "Failed to release engine.");
} finally {
engines[index] = null;
}
}
if (idleEngineIndexSet.contains(index)) {
idleEngineIndexSet.remove(index);
idleEngineIndexList.remove(index);
}
if (!releasedEngineIndexSet.contains(index)) {
releasedEngineIndexSet.add(index);
releasedEngineIndexList.add(index);
}
}
}
logger.debug("JavetEnginePool.run() ends.");
}
/**
* Start daemon.
*
* @since 0.7.0
*/
protected void startDaemon() {
IJavetLogger logger = config.getJavetLogger();
logger.debug("JavetEnginePool.startDaemon() begins.");
idleEngineIndexList.clear();
releasedEngineIndexList.clear();
for (int i = 0; i < engines.length; ++i) {
releasedEngineIndexList.add(i);
}
semaphore = new Semaphore(engines.length);
quitting = false;
config.setExecutorService(Executors.newCachedThreadPool());
daemonThread = new Thread(this);
daemonThread.setDaemon(true);
daemonThread.setName(JAVET_DAEMON_THREAD_NAME);
daemonThread.start();
active = true;
logger.debug("JavetEnginePool.startDaemon() ends.");
}
/**
* Stop daemon.
*
* @since 0.7.0
*/
protected void stopDaemon() {
IJavetLogger logger = config.getJavetLogger();
logger.debug("JavetEnginePool.stopDaemon() begins.");
quitting = true;
try {
config.getExecutorService().shutdown();
//noinspection ResultOfMethodCallIgnored
config.getExecutorService().awaitTermination(config.getPoolShutdownTimeoutSeconds(), TimeUnit.SECONDS);
} catch (Exception e) {
logger.logError(e, e.getMessage());
} finally {
config.setExecutorService(null);
}
try {
if (daemonThread != null) {
daemonThread.join();
}
} catch (Exception e) {
logger.logError(e, e.getMessage());
} finally {
daemonThread = null;
}
active = false;
quitting = false;
semaphore = null;
logger.debug("JavetEnginePool.stopDaemon() ends.");
}
@Override
public void wakeUpDaemon() {
synchronized (externalLock) {
externalLock.notify();
}
}
}