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/**
* DataCleaner (community edition)
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.datacleaner.cluster;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import org.datacleaner.api.AnalyzerResult;
import org.datacleaner.api.AnalyzerResultReducer;
import org.datacleaner.descriptors.ComponentDescriptor;
import org.datacleaner.descriptors.Descriptors;
import org.datacleaner.job.AnalysisJob;
import org.datacleaner.job.AnalyzerJob;
import org.datacleaner.job.AnalyzerJobHelper;
import org.datacleaner.job.ComponentJob;
import org.datacleaner.job.runner.AnalysisListener;
import org.datacleaner.job.runner.AnalysisResultFuture;
import org.datacleaner.job.runner.RowProcessingPublisher;
import org.datacleaner.lifecycle.LifeCycleHelper;
import org.datacleaner.util.CollectionUtils2;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Helper class to perform the reduction phase of {@link AnalyzerResult}s
* collected in a {@link DistributedAnalysisResultFuture}.
*/
final class DistributedAnalysisResultReducer {
private static final Logger logger = LoggerFactory.getLogger(DistributedAnalysisResultReducer.class);
private final AnalysisJob _masterJob;
private final LifeCycleHelper _lifeCycleHelper;
private final RowProcessingPublisher _publisher;
private final AnalysisListener _analysisListener;
private final AtomicBoolean _hasRun;
public DistributedAnalysisResultReducer(final AnalysisJob masterJob, final LifeCycleHelper lifeCycleHelper,
final RowProcessingPublisher publisher, final AnalysisListener analysisListener) {
_masterJob = masterJob;
_lifeCycleHelper = lifeCycleHelper;
_publisher = publisher;
_analysisListener = analysisListener;
_hasRun = new AtomicBoolean(false);
}
public void reduce(final List results, final Map resultMap,
final List reductionErrors) {
final int size = results.size();
try {
logger.debug("Starting reduce phase of {} results", size);
reduceResults(results, resultMap, reductionErrors);
logger.debug("Finished reduce phase of {} results", size);
} finally {
closeNonDistributableComponents();
}
}
private void closeNonDistributableComponents() {
_publisher.closeConsumers();
}
/**
* Reduces all the analyzer results of an analysis
*
* @param results
* @param resultMap
* @param reductionErrors
*/
private void reduceResults(final List results,
final Map resultMap,
final List reductionErrors) {
if (_hasRun.get()) {
// already reduced
return;
}
_hasRun.set(true);
for (final AnalysisResultFuture result : results) {
if (result.isErrornous()) {
logger.error("Encountered errorneous slave result. Result reduction will stop. Result={}", result);
final List errors = result.getErrors();
if (!errors.isEmpty()) {
final Throwable firstError = errors.get(0);
logger.error(
"Encountered error before reducing results (showing stack trace of invoking the reducer): "
+ firstError.getMessage(), new Throwable());
_analysisListener.errorUnknown(_masterJob, firstError);
}
// error occurred!
return;
}
}
final Collection analyzerJobs = _masterJob.getAnalyzerJobs();
for (final AnalyzerJob masterAnalyzerJob : analyzerJobs) {
final Collection slaveResults = new ArrayList<>();
logger.info("Reducing {} slave results for component: {}", results.size(), masterAnalyzerJob);
for (final AnalysisResultFuture result : results) {
final Map slaveResultMap = result.getResultMap();
final List slaveAnalyzerJobs =
CollectionUtils2.filterOnClass(slaveResultMap.keySet(), AnalyzerJob.class);
final AnalyzerJobHelper analyzerJobHelper = new AnalyzerJobHelper(slaveAnalyzerJobs);
final AnalyzerJob slaveAnalyzerJob = analyzerJobHelper.getAnalyzerJob(masterAnalyzerJob);
if (slaveAnalyzerJob == null) {
throw new IllegalStateException(
"Could not resolve slave component matching [" + masterAnalyzerJob + "] in slave result: "
+ result);
}
final AnalyzerResult analyzerResult = result.getResult(slaveAnalyzerJob);
slaveResults.add(analyzerResult);
}
reduce(masterAnalyzerJob, slaveResults, resultMap, reductionErrors);
}
}
/**
* Reduces result for a single analyzer
*
* @param analyzerJob
* @param slaveResults
* @param resultMap
* @param reductionErrors
*/
@SuppressWarnings("unchecked")
private void reduce(final AnalyzerJob analyzerJob, final Collection slaveResults,
final Map resultMap,
final List reductionErrors) {
if (slaveResults.size() == 1) {
// special case where these was only 1 slave job
final AnalyzerResult firstResult = slaveResults.iterator().next();
resultMap.put(analyzerJob, firstResult);
_analysisListener.componentSuccess(_masterJob, analyzerJob, firstResult);
return;
}
final Class> reducerClass =
analyzerJob.getDescriptor().getResultReducerClass();
final ComponentDescriptor> reducerDescriptor =
Descriptors.ofComponent(reducerClass);
AnalyzerResultReducer reducer = null;
boolean success = false;
try {
reducer = (AnalyzerResultReducer) reducerDescriptor.newInstance();
_lifeCycleHelper.assignProvidedProperties(reducerDescriptor, reducer);
_lifeCycleHelper.initialize(reducerDescriptor, reducer);
final AnalyzerResult reducedResult = reducer.reduce(slaveResults);
resultMap.put(analyzerJob, reducedResult);
success = true;
_analysisListener.componentSuccess(_masterJob, analyzerJob, reducedResult);
} catch (final Exception e) {
final AnalysisResultReductionException reductionError =
new AnalysisResultReductionException(analyzerJob, slaveResults, e);
reductionErrors.add(reductionError);
_analysisListener.errorInComponent(_masterJob, analyzerJob, null, e);
} finally {
if (reducer != null) {
_lifeCycleHelper.close(reducerDescriptor, reducer, success);
}
}
}
}
