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StatTrackingStore.java
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StatTrackingStore.java
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/*
* Copyright 2008-2009 LinkedIn, 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 voldemort.store.stats;
import java.util.List;
import java.util.Map;
import javax.management.MBeanOperationInfo;
import voldemort.VoldemortException;
import voldemort.annotations.jmx.JmxOperation;
import voldemort.store.DelegatingStore;
import voldemort.store.Store;
import voldemort.store.StoreCapabilityType;
import voldemort.utils.ByteArray;
import voldemort.versioning.ObsoleteVersionException;
import voldemort.versioning.Version;
import voldemort.versioning.Versioned;
/**
* A store wrapper that tracks basic usage statistics
*
*
*/
public class StatTrackingStore extends DelegatingStore<ByteArray, byte[], byte[]> {
private StoreStats stats;
public StatTrackingStore(Store<ByteArray, byte[], byte[]> innerStore, StoreStats parentStats) {
super(innerStore);
this.stats = new StoreStats(parentStats);
}
@Override
public boolean delete(ByteArray key, Version version) throws VoldemortException {
long start = System.nanoTime();
try {
return super.delete(key, version);
} catch(VoldemortException e) {
stats.recordTime(Tracked.EXCEPTION, System.nanoTime() - start);
throw e;
} finally {
stats.recordTime(Tracked.DELETE, System.nanoTime() - start);
}
}
@Override
public List<Versioned<byte[]>> get(ByteArray key, byte[] transforms) throws VoldemortException {
List<Versioned<byte[]>> result = null;
long start = System.nanoTime();
try {
result = super.get(key, transforms);
return result;
} catch(VoldemortException e) {
stats.recordTime(Tracked.EXCEPTION, System.nanoTime() - start);
throw e;
} finally {
long duration = System.nanoTime() - start;
long totalBytes = 0;
boolean returningEmpty = true;
if(result != null) {
returningEmpty = result.size() == 0;
for(Versioned<byte[]> bytes: result) {
totalBytes += bytes.getValue().length;
}
}
stats.recordGetTime(duration, returningEmpty, totalBytes);
}
}
@Override
public Map<ByteArray, List<Versioned<byte[]>>> getAll(Iterable<ByteArray> keys,
Map<ByteArray, byte[]> transforms)
throws VoldemortException {
Map<ByteArray, List<Versioned<byte[]>>> result = null;
long start = System.nanoTime();
try {
result = super.getAll(keys, transforms);
return result;
} catch(VoldemortException e) {
stats.recordTime(Tracked.EXCEPTION, System.nanoTime() - start);
throw e;
} finally {
long duration = System.nanoTime() - start;
long totalBytes = 0;
int requestedValues = 0;
int returnedValues = 0;
// Determine how many values were requested
for(ByteArray k: keys) {
requestedValues++;
}
if(result != null) {
// Determine the number of values being returned
returnedValues = result.keySet().size();
// Determine the total size of the response
for(List<Versioned<byte[]>> value: result.values()) {
for(Versioned<byte[]> bytes: value) {
totalBytes += bytes.getValue().length;
}
}
}
stats.recordGetAllTime(duration, requestedValues, returnedValues, totalBytes);
}
}
@Override
public void put(ByteArray key, Versioned<byte[]> value, byte[] transforms)
throws VoldemortException {
long start = System.nanoTime();
try {
super.put(key, value, transforms);
} catch(ObsoleteVersionException e) {
stats.recordTime(Tracked.OBSOLETE, System.nanoTime() - start);
throw e;
} catch(VoldemortException e) {
stats.recordTime(Tracked.EXCEPTION, System.nanoTime() - start);
throw e;
} finally {
stats.recordPutTimeAndSize(System.nanoTime() - start, value.getValue().length);
}
}
@Override
public Object getCapability(StoreCapabilityType capability) {
if(StoreCapabilityType.STAT_TRACKER.equals(capability))
return this.stats;
else
return super.getCapability(capability);
}
/**
* To be used for applications that use a custom metrics framework
* @return The StoreStats object for this specific store
*/
public StoreStats getStats() {
return stats;
}
@JmxOperation(description = "Reset statistics.", impact = MBeanOperationInfo.ACTION)
public void resetStatistics() {
this.stats = new StoreStats();
}
}