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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package jdk.jfr.internal.periodic;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import jdk.jfr.internal.JVM;
import jdk.jfr.internal.PlatformEventType;

/**
 * Task for periodic events defined in the JVM.
 * <p>
 * This class guarantees that only one event can execute in native at a time.
 */
final class JVMEventTask extends EventTask {
    // java.util.concurrent lock is used to avoid JavaMonitorBlocked event from
    // synchronized block.
    private static final Lock lock = new ReentrantLock();

    public JVMEventTask(PlatformEventType eventType) {
        super(eventType, new LookupKey(eventType));
        if (!eventType.isJVM()) {
            throw new InternalError("Must be a JVM event");
        }
    }

    @Override
    public void execute(long timestamp, PeriodicType periodicType) {
        try {
            lock.lock();
            JVM.emitEvent(getEventType().getId(), timestamp, periodicType.ordinal());
        } finally {
            lock.unlock();
        }
    }
}