/*
* Copyright © 2015 Cask Data, Inc.
*
* 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 co.cask.cdap.data.stream.service;
import co.cask.cdap.proto.Id;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.util.concurrent.AbstractIdleService;
import org.apache.twill.common.Cancellable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicLong;
/**
* Basic implementation of a {@link StreamWriterSizeCollector}.
*/
public class BasicStreamWriterSizeCollector extends AbstractIdleService implements StreamWriterSizeCollector {
private static final Logger LOG = LoggerFactory.getLogger(BasicStreamWriterSizeCollector.class);
private final ConcurrentMap<Id.Stream, AtomicLong> streamSizes;
private final List<Cancellable> truncationSubscriptions;
public BasicStreamWriterSizeCollector() {
this.streamSizes = Maps.newConcurrentMap();
this.truncationSubscriptions = Lists.newArrayList();
}
@Override
protected void startUp() throws Exception {
// No-op
}
@Override
protected void shutDown() throws Exception {
for (Cancellable subscription : truncationSubscriptions) {
subscription.cancel();
}
}
public Map<Id.Stream, AtomicLong> getStreamSizes() {
return ImmutableMap.copyOf(streamSizes);
}
@Override
public long getTotalCollected(Id.Stream streamId) {
AtomicLong collected = streamSizes.get(streamId);
return collected != null ? collected.get() : 0;
}
@Override
public synchronized void received(Id.Stream streamId, long dataSize) {
AtomicLong value = streamSizes.get(streamId);
if (value == null) {
value = streamSizes.putIfAbsent(streamId, new AtomicLong(dataSize));
}
if (value != null) {
value.addAndGet(dataSize);
}
LOG.trace("Received data for stream {}: {}B. Total size is now {}", streamId, dataSize,
value == null ? dataSize : value.get());
}
}