dyorgio.runtime.cpu.watcher.AbstractProcessWatcher Maven / Gradle / Ivy

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A Java Library/App to limit another process CPU usage.

There is a newer version: 1.3.1

/** *****************************************************************************
 * Copyright 2018 See AUTHORS file.
 *
 * 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 dyorgio.runtime.cpu.watcher;

import org.hyperic.sigar.ProcCpu;

/**
 *
 * @author dyorgio
 */
public abstract class AbstractProcessWatcher {

    protected final long pid;
    protected boolean resumed = true;

    protected AbstractProcessWatcher(final long pid) {
        this.pid = pid;
    }

    public final boolean isResumed() {
        return resumed;
    }

    public final boolean isSuspended() {
        return !resumed;
    }

    public final void suspend() {
        suspendImpl();
        resumed = false;
    }

    public final void resume() {
        resumeImpl();
        resumed = true;
    }

    public CpuTimes getCpuTimes() {
        try {
            ProcCpu procCpu = SigarUtil.getSigar().getProcCpu(this.pid);

            long userTime = (procCpu.getUser() * 1000);
            long systemTime = (procCpu.getSys() * 1000);

            return new CpuTimes(//
                    userTime,//
                    systemTime,//
                    ((procCpu.getLastTime() - procCpu.getStartTime()) * SigarUtil.getCpuCount()) - (userTime + systemTime) ////
            );
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    protected abstract void suspendImpl();

    protected abstract void resumeImpl();
}