/*
* 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 com.facebook.presto.execution.scheduler;
import io.airlift.stats.CounterStat;
import org.weakref.jmx.JmxException;
import org.weakref.jmx.MBeanExporter;
import org.weakref.jmx.ObjectNames;
import javax.annotation.PreDestroy;
import javax.annotation.concurrent.GuardedBy;
import javax.inject.Inject;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static java.util.Objects.requireNonNull;
public final class NodeSchedulerExporter
{
private final MBeanExporter exporter;
@GuardedBy("this")
private final List<String> objectNames = new ArrayList<>();
@Inject
public NodeSchedulerExporter(NodeScheduler nodeScheduler, MBeanExporter exporter)
{
this.exporter = requireNonNull(exporter, "exporter is null");
Map<String, CounterStat> topologicalSplitCounters = nodeScheduler.getTopologicalSplitCounters();
for (Map.Entry<String, CounterStat> entry : topologicalSplitCounters.entrySet()) {
try {
String objectName = ObjectNames.builder(NodeScheduler.class).withProperty("segment", entry.getKey()).build();
this.exporter.export(objectName, entry.getValue());
objectNames.add(objectName);
}
catch (JmxException e) {
// ignored
}
}
}
@PreDestroy
public synchronized void destroy()
{
for (String objectName : objectNames) {
try {
exporter.unexport(objectName);
}
catch (JmxException e) {
// ignored
}
}
objectNames.clear();
}
}