104 lines
3.5 KiB
Java
104 lines
3.5 KiB
Java
/*
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* This file is part of Player Analytics (Plan).
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*
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* Plan is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License v3 as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Plan is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Plan. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.djrapitops.plan.utilities;
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import com.djrapitops.plan.storage.database.SQLDB;
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import com.djrapitops.plan.utilities.java.ThrowableUtils;
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import org.jetbrains.annotations.NotNull;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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public class SemaphoreAccessCounter {
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private final AtomicInteger accessCounter;
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private final Object lockObject;
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private final Collection<String> holds = Collections.newSetFromMap(new ConcurrentHashMap<>());
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public SemaphoreAccessCounter() {
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accessCounter = new AtomicInteger(0);
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lockObject = new Object();
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}
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@NotNull
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private static String getAccessingThing() {
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boolean previousWasAccess = false;
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List<StackTraceElement> accessors = new ArrayList<>();
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StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
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StackTraceElement[] origin = SQLDB.getTransactionOrigin().get();
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StackTraceElement[] callSite = ThrowableUtils.combineStackTrace(origin, stackTrace);
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for (StackTraceElement e : callSite) {
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if (previousWasAccess) {
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accessors.add(e);
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previousWasAccess = false;
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}
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String call = e.getClassName() + "." + e.getMethodName();
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if ("com.djrapitops.plan.storage.database.SQLDB.query".equals(call)
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|| "com.djrapitops.plan.storage.database.SQLDB.executeTransaction".equals(call)) {
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previousWasAccess = true;
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}
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}
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if (accessors.isEmpty()) accessors.addAll(Arrays.asList(callSite));
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return accessors.toString();
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}
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public void enter() {
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accessCounter.incrementAndGet();
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holds.add(getAccessingThing());
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}
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public void exit() {
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synchronized (lockObject) {
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holds.remove(getAccessingThing());
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int value = accessCounter.decrementAndGet();
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if (value == 0) {
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lockObject.notifyAll();
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}
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}
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}
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public void waitUntilNothingAccessing() {
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while (accessCounter.get() > 0) {
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synchronized (lockObject) {
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try {
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logAccess();
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lockObject.wait();
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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}
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}
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}
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}
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private void logAccess() {
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Logger logger = Logger.getLogger("Plan");
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if (logger == null) logger = Logger.getGlobal();
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if (logger.isLoggable(Level.INFO) && !holds.isEmpty()) {
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logger.log(Level.INFO, "Waiting for these connections to finish:");
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for (String hold : holds) {
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logger.log(Level.INFO, hold);
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}
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}
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}
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}
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