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A module that is everything required to understands Druid Segments
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets licenses this file
* to you 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.druid.query;
import com.google.common.base.Function;
import com.google.common.base.Strings;
import com.google.common.collect.Maps;
import com.metamx.common.guava.Accumulator;
import com.metamx.common.guava.Sequence;
import com.metamx.common.guava.Yielder;
import com.metamx.common.guava.YieldingAccumulator;
import com.metamx.emitter.service.ServiceEmitter;
import com.metamx.emitter.service.ServiceMetricEvent;
import java.io.IOException;
import java.util.Map;
/**
*/
public class MetricsEmittingQueryRunner implements QueryRunner
{
private static final String DEFAULT_METRIC_NAME = "query/partial/time";
private final ServiceEmitter emitter;
private final Function, ServiceMetricEvent.Builder> builderFn;
private final QueryRunner queryRunner;
private final long creationTime;
private final String metricName;
private final Map userDimensions;
public MetricsEmittingQueryRunner(
ServiceEmitter emitter,
Function, ServiceMetricEvent.Builder> builderFn,
QueryRunner queryRunner
)
{
this(emitter, builderFn, queryRunner, DEFAULT_METRIC_NAME, Maps.newHashMap());
}
public MetricsEmittingQueryRunner(
ServiceEmitter emitter,
Function, ServiceMetricEvent.Builder> builderFn,
QueryRunner queryRunner,
long creationTime,
String metricName,
Map userDimensions
)
{
this.emitter = emitter;
this.builderFn = builderFn;
this.queryRunner = queryRunner;
this.creationTime = creationTime;
this.metricName = metricName;
this.userDimensions = userDimensions;
}
public MetricsEmittingQueryRunner(
ServiceEmitter emitter,
Function, ServiceMetricEvent.Builder> builderFn,
QueryRunner queryRunner,
String metricName,
Map userDimensions
)
{
this(emitter, builderFn, queryRunner, -1, metricName, userDimensions);
}
public MetricsEmittingQueryRunner withWaitMeasuredFromNow()
{
return new MetricsEmittingQueryRunner(
emitter,
builderFn,
queryRunner,
System.currentTimeMillis(),
metricName,
userDimensions
);
}
@Override
public Sequence run(final Query query, final Map responseContext)
{
final ServiceMetricEvent.Builder builder = builderFn.apply(query);
for (Map.Entry userDimension : userDimensions.entrySet()) {
builder.setDimension(userDimension.getKey(), userDimension.getValue());
}
builder.setDimension(DruidMetrics.ID, Strings.nullToEmpty(query.getId()));
return new Sequence()
{
@Override
public OutType accumulate(OutType outType, Accumulator accumulator)
{
OutType retVal;
long startTime = System.currentTimeMillis();
try {
retVal = queryRunner.run(query, responseContext).accumulate(outType, accumulator);
}
catch (RuntimeException e) {
builder.setDimension(DruidMetrics.STATUS, "failed");
throw e;
}
catch (Error e) {
builder.setDimension(DruidMetrics.STATUS, "failed");
throw e;
}
finally {
long timeTaken = System.currentTimeMillis() - startTime;
emitter.emit(builder.build(metricName, timeTaken));
if (creationTime > 0) {
emitter.emit(builder.build("query/wait/time", startTime - creationTime));
}
}
return retVal;
}
@Override
public Yielder toYielder(OutType initValue, YieldingAccumulator accumulator)
{
Yielder retVal;
long startTime = System.currentTimeMillis();
try {
retVal = queryRunner.run(query, responseContext).toYielder(initValue, accumulator);
}
catch (RuntimeException e) {
builder.setDimension(DruidMetrics.STATUS, "failed");
throw e;
}
catch (Error e) {
builder.setDimension(DruidMetrics.STATUS, "failed");
throw e;
}
return makeYielder(startTime, retVal, builder);
}
private Yielder makeYielder(
final long startTime,
final Yielder yielder,
final ServiceMetricEvent.Builder builder
)
{
return new Yielder()
{
@Override
public OutType get()
{
return yielder.get();
}
@Override
public Yielder next(OutType initValue)
{
try {
return makeYielder(startTime, yielder.next(initValue), builder);
}
catch (RuntimeException e) {
builder.setDimension(DruidMetrics.STATUS, "failed");
throw e;
}
catch (Error e) {
builder.setDimension(DruidMetrics.STATUS, "failed");
throw e;
}
}
@Override
public boolean isDone()
{
return yielder.isDone();
}
@Override
public void close() throws IOException
{
try {
if (!isDone() && builder.getDimension(DruidMetrics.STATUS) == null) {
builder.setDimension(DruidMetrics.STATUS, "short");
}
long timeTaken = System.currentTimeMillis() - startTime;
emitter.emit(builder.build(metricName, timeTaken));
if (creationTime > 0) {
emitter.emit(builder.build("query/wait/time", startTime - creationTime));
}
}
finally {
yielder.close();
}
}
};
}
};
}
}
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