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/*
* Copyright 2018, OpenCensus Authors
*
* 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 io.opencensus.implcore.metrics.export;
import com.google.common.base.Preconditions;
import io.opencensus.metrics.MetricProducer;
import io.opencensus.metrics.export.MetricProducerManager;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.annotation.concurrent.ThreadSafe;
/** Implementation of {@link MetricProducerManager}. */
@ThreadSafe
public final class MetricProducerManagerImpl extends MetricProducerManager {
private volatile Set<MetricProducer> metricProducers =
Collections.unmodifiableSet(new LinkedHashSet<MetricProducer>());
@Override
public synchronized void add(MetricProducer metricProducer) {
Preconditions.checkNotNull(metricProducer, "metricProducer");
// Updating the set of MetricProducers happens under a lock to avoid multiple add or remove
// operations to happen in the same time.
Set<MetricProducer> newMetricProducers = new LinkedHashSet<MetricProducer>(metricProducers);
if (!newMetricProducers.add(metricProducer)) {
// The element already present, no need to update the current set of MetricProducers.
return;
}
metricProducers = Collections.unmodifiableSet(newMetricProducers);
}
@Override
public synchronized void remove(MetricProducer metricProducer) {
Preconditions.checkNotNull(metricProducer, "metricProducer");
// Updating the set of MetricProducers happens under a lock to avoid multiple add or remove
// operations to happen in the same time.
Set<MetricProducer> newMetricProducers = new LinkedHashSet<MetricProducer>(metricProducers);
if (!newMetricProducers.remove(metricProducer)) {
// The element not present, no need to update the current set of MetricProducers.
return;
}
metricProducers = Collections.unmodifiableSet(newMetricProducers);
}
@Override
public Set<MetricProducer> getAllMetricProducer() {
return metricProducers;
}
}
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