/**
* Copyright 2014 Alexey Ragozin
*
* 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 org.gridkit.jvmtool;
import org.gridkit.lab.jvm.perfdata.JStatData;
import org.gridkit.lab.jvm.perfdata.JStatData.LongCounter;
import org.gridkit.lab.jvm.perfdata.JStatData.TickCounter;
public class PerfCounterSafePointMonitor implements SafePointMonitor {
LongCounter safePointCount;
TickCounter safePointTime;
TickCounter safePointSyncTime;
public PerfCounterSafePointMonitor(long pid) {
JStatData jd = JStatData.connect(pid);
safePointCount = (LongCounter) jd.getAllCounters().get("sun.rt.safepoints");
safePointTime = (TickCounter) jd.getAllCounters().get("sun.rt.safepointTime");
safePointSyncTime = (TickCounter) jd.getAllCounters().get("sun.rt.safepointSyncTime");
}
public boolean isAvailable() {
return safePointCount != null && safePointTime != null && safePointSyncTime != null;
}
@Override
public long getSafePointCount() {
return safePointCount == null ? 0 : safePointCount.getLong();
}
@Override
public long getSafePointTime() {
return safePointTime == null ? 0 : safePointTime.getNanos();
}
@Override
public long getSafePointSyncTime() {
return safePointSyncTime == null ? 0 : safePointSyncTime.getNanos();
}
}