194 lines
6.4 KiB
Java
194 lines
6.4 KiB
Java
/*
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* Copyright 2013 Robert von Burg <eitch@eitchnet.ch>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package li.strolch.agent.impl;
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import java.text.MessageFormat;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ScheduledFuture;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.locks.ReentrantLock;
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import li.strolch.agent.api.LockHandler;
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import li.strolch.agent.api.StrolchAgent;
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import li.strolch.agent.api.StrolchLockException;
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import li.strolch.model.Locator;
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import li.strolch.utils.collections.TypedTuple;
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import li.strolch.utils.dbc.DBC;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* @author Robert von Burg <eitch@eitchnet.ch>
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*/
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public class DefaultLockHandler implements LockHandler {
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private static final Logger logger = LoggerFactory.getLogger(DefaultLockHandler.class);
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private final StrolchAgent agent;
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private final String realm;
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private final TimeUnit tryLockTimeUnit;
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private final long tryLockTime;
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private final Map<Locator, TypedTuple<ReentrantLock, Long>> lockMap;
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private ScheduledFuture<?> cleanupTask;
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public DefaultLockHandler(StrolchAgent agent, String realm, TimeUnit tryLockTimeUnit, long tryLockTime) {
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DBC.PRE.assertNotNull("agent must be set!", agent); //$NON-NLS-1$
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DBC.PRE.assertNotEmpty("Realm must be set!", realm); //$NON-NLS-1$
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DBC.PRE.assertNotNull("TimeUnit must be set!", tryLockTimeUnit); //$NON-NLS-1$
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DBC.PRE.assertNotEquals("try lock time must not be 0", 0, tryLockTime); //$NON-NLS-1$
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this.agent = agent;
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this.realm = realm;
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this.tryLockTimeUnit = tryLockTimeUnit;
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this.tryLockTime = tryLockTime;
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this.lockMap = new ConcurrentHashMap<>();
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}
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@Override
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public void start() {
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this.cleanupTask = agent.getScheduledExecutor()
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.scheduleAtFixedRate(this::cleanupOldLocks, 1, 1, TimeUnit.HOURS);
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}
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@Override
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public void stop() {
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if (this.cleanupTask != null)
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this.cleanupTask.cancel(true);
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}
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private void cleanupOldLocks() {
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Map<Locator, TypedTuple<ReentrantLock, Long>> lockMap;
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synchronized (this.lockMap) {
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lockMap = new HashMap<>(this.lockMap);
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}
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long maxAge = System.currentTimeMillis() - TimeUnit.HOURS.toMillis(1);
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long count = 0;
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for (Map.Entry<Locator, TypedTuple<ReentrantLock, Long>> entry : lockMap.entrySet()) {
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if (!entry.getValue().getFirst().isLocked() && entry.getValue().getSecond() <= maxAge) {
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this.lockMap.remove(entry.getKey());
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count++;
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}
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}
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logger.info("Pruned " + count + " Locator locks.");
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}
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public String getRealm() {
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return this.realm;
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}
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@Override
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public void lock(Locator locator) throws StrolchLockException {
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TypedTuple<ReentrantLock, Long> tuple = this.lockMap.computeIfAbsent(locator,
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l -> new TypedTuple<>(new ReentrantLock(true), System.currentTimeMillis()));
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lock(this.tryLockTimeUnit, this.tryLockTime, tuple, locator);
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}
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@Override
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public void unlock(Locator locator) throws StrolchLockException {
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TypedTuple<ReentrantLock, Long> tuple = this.lockMap.get(locator);
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ReentrantLock lock = tuple.getFirst();
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if (lock == null || !lock.isHeldByCurrentThread()) {
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logger.error(MessageFormat.format("Trying to unlock not locked element {0}", locator)); //$NON-NLS-1$
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} else {
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// logger.debug("unlocking " + locator); //$NON-NLS-1$
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unlock(lock);
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}
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}
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@Override
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public void releaseLock(Locator locator) throws StrolchLockException {
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TypedTuple<ReentrantLock, Long> tuple = this.lockMap.get(locator);
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ReentrantLock lock = tuple.getFirst();
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if (lock == null) {
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logger.error(MessageFormat.format("Trying to unlock not locked element {0}", locator));
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} else if (!lock.isHeldByCurrentThread()) {
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if (lock.isLocked())
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logger.error(MessageFormat.format("Lock not held by this thread for element {0}", locator));
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else
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logger.error(MessageFormat.format("Element {0} is not locked!", locator));
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} else {
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//logger.info("releasing lock " + locator); //$NON-NLS-1$
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releaseLock(lock);
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}
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}
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/**
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* @see java.util.concurrent.locks.ReentrantLock#tryLock(long, TimeUnit)
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*/
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private void lock(TimeUnit timeUnit, long tryLockTime, TypedTuple<ReentrantLock, Long> tuple, Locator locator)
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throws StrolchLockException {
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try {
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if (!tuple.getFirst().tryLock() && !tuple.getFirst().tryLock(tryLockTime, timeUnit)) {
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String msg = "Thread {0} failed to acquire lock after {1}s for {2}"; //$NON-NLS-1$
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msg = MessageFormat.format(msg, Thread.currentThread().getName(), timeUnit.toSeconds(tryLockTime),
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locator);
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try {
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logger.error(msg);
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logger.error("Listing all active threads: ");
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Map<Thread, StackTraceElement[]> allStackTraces = Thread.getAllStackTraces();
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for (Thread thread : allStackTraces.keySet()) {
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StackTraceElement[] trace = allStackTraces.get(thread);
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StringBuilder sb = new StringBuilder();
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for (StackTraceElement traceElement : trace)
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sb.append("\n\tat ").append(traceElement);
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logger.error("\nThread " + thread.getName() + ":\n" + sb.toString() + "\n");
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}
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} catch (Exception e) {
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logger.error("Failed to log active threads: " + e.getMessage(), e);
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}
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throw new StrolchLockException(msg);
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}
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tuple.setSecond(System.currentTimeMillis());
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// logger.debug("locked " + locator); //$NON-NLS-1$
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} catch (InterruptedException e) {
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throw new StrolchLockException("Interrupted while trying to acquire lock for " + locator, e);
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}
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}
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/**
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* @see java.util.concurrent.locks.ReentrantLock#unlock()
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*/
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private void unlock(ReentrantLock lock) throws StrolchLockException {
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try {
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lock.unlock();
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} catch (IllegalMonitorStateException e) {
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throw new StrolchLockException("IllegalMonitorStateException when trying to unlock: " + e.getMessage(),
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e); //$NON-NLS-1$
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}
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}
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/**
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* @see java.util.concurrent.locks.ReentrantLock#unlock()
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*/
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private void releaseLock(ReentrantLock lock) {
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while (lock.isHeldByCurrentThread() && lock.isLocked()) {
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unlock(lock);
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}
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}
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}
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