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/*
* Copyright 2010-2012 Ning, Inc.
*
* Ning 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 com.ning.billing.meter.timeline;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import javax.annotation.Nullable;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ning.billing.meter.MeterConfig;
import com.ning.billing.meter.timeline.chunks.TimelineChunk;
import com.ning.billing.meter.timeline.codec.SampleCoder;
import com.ning.billing.meter.timeline.persistent.FileBackedBuffer;
import com.ning.billing.meter.timeline.persistent.Replayer;
import com.ning.billing.meter.timeline.persistent.TimelineDao;
import com.ning.billing.meter.timeline.samples.ScalarSample;
import com.ning.billing.meter.timeline.shutdown.ShutdownSaveMode;
import com.ning.billing.meter.timeline.shutdown.StartTimes;
import com.ning.billing.meter.timeline.sources.SourceSamplesForTimestamp;
import com.ning.billing.meter.timeline.times.TimelineCoder;
import com.ning.billing.util.callcontext.CallContext;
import com.ning.billing.util.callcontext.TenantContext;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.inject.Inject;
public class TimelineEventHandler {
private static final Logger log = LoggerFactory.getLogger(TimelineEventHandler.class);
private final ScheduledExecutorService purgeThread = Executors.newSingleThreadScheduledExecutor();
private static final Comparator CHUNK_COMPARATOR = new Comparator() {
@Override
public int compare(final TimelineChunk o1, final TimelineChunk o2) {
final int hostDiff = o1.getSourceId() - o1.getSourceId();
if (hostDiff < 0) {
return -1;
} else if (hostDiff > 0) {
return 1;
} else {
final int metricIdDiff = o1.getMetricId() - o2.getMetricId();
if (metricIdDiff < 0) {
return -1;
} else if (metricIdDiff > 0) {
return 1;
} else {
final long startTimeDiff = o1.getStartTime().getMillis() - o2.getStartTime().getMillis();
if (startTimeDiff < 0) {
return -1;
} else if (startTimeDiff > 0) {
return 1;
} else {
return 0;
}
}
}
}
};
// A TimelineSourceEventAccumulator records attributes for a specific host and event type.
// This cache maps sourceId -> categoryId -> accumulator
//
// TODO: There are still timing windows in the use of accumulators. Enumerate them and
// either fix them or prove they are benign
private final Map accumulators = new ConcurrentHashMap();
private final MeterConfig config;
private final TimelineDao timelineDAO;
private final TimelineCoder timelineCoder;
private final SampleCoder sampleCoder;
private final BackgroundDBChunkWriter backgroundWriter;
private final FileBackedBuffer backingBuffer;
private final ShutdownSaveMode shutdownSaveMode;
private final AtomicBoolean shuttingDown = new AtomicBoolean();
private final AtomicBoolean replaying = new AtomicBoolean();
private final AtomicLong eventsDiscarded = new AtomicLong(0L);
private final AtomicLong eventsReceivedAfterShuttingDown = new AtomicLong();
private final AtomicLong handledEventCount = new AtomicLong();
private final AtomicLong addedSourceEventAccumulatorMapCount = new AtomicLong();
private final AtomicLong addedSourceEventAccumulatorCount = new AtomicLong();
private final AtomicLong getInMemoryChunksCallCount = new AtomicLong();
private final AtomicLong accumulatorDeepCopyCount = new AtomicLong();
private final AtomicLong inMemoryChunksReturnedCount = new AtomicLong();
private final AtomicLong replayCount = new AtomicLong();
private final AtomicLong replaySamplesFoundCount = new AtomicLong();
private final AtomicLong replaySamplesOutsideTimeRangeCount = new AtomicLong();
private final AtomicLong replaySamplesProcessedCount = new AtomicLong();
private final AtomicLong forceCommitCallCount = new AtomicLong();
private final AtomicLong purgedAccumsBecauseSourceNotUpdated = new AtomicLong();
private final AtomicLong purgedAccumsBecauseCategoryNotUpdated = new AtomicLong();
@Inject
public TimelineEventHandler(final MeterConfig config, final TimelineDao timelineDAO, final TimelineCoder timelineCoder, final SampleCoder sampleCoder, final BackgroundDBChunkWriter backgroundWriter, final FileBackedBuffer fileBackedBuffer) {
this.config = config;
this.timelineDAO = timelineDAO;
this.timelineCoder = timelineCoder;
this.sampleCoder = sampleCoder;
this.backgroundWriter = backgroundWriter;
this.backingBuffer = fileBackedBuffer;
this.shutdownSaveMode = ShutdownSaveMode.fromString(config.getShutdownSaveMode());
}
private void saveAccumulators() {
for (final Map.Entry entry : accumulators.entrySet()) {
final int sourceId = entry.getKey();
final Map hostAccumulators = entry.getValue().getCategoryAccumulators();
for (final Map.Entry accumulatorEntry : hostAccumulators.entrySet()) {
final int categoryId = accumulatorEntry.getKey();
final TimelineSourceEventAccumulator accumulator = accumulatorEntry.getValue();
log.debug("Saving Timeline for sourceId [{}] and categoryId [{}]", sourceId, categoryId);
accumulator.extractAndQueueTimelineChunks();
}
}
}
private void saveStartTimes(final StartTimes startTimes) {
for (final Map.Entry entry : accumulators.entrySet()) {
final int sourceId = entry.getKey();
final Map hostAccumulators = entry.getValue().getCategoryAccumulators();
for (final Map.Entry accumulatorEntry : hostAccumulators.entrySet()) {
final int categoryId = accumulatorEntry.getKey();
final TimelineSourceEventAccumulator accumulator = accumulatorEntry.getValue();
log.debug("Saving Timeline start time for sourceId [{}] and category [{}]", sourceId, categoryId);
startTimes.addTime(sourceId, categoryId, accumulator.getStartTime());
}
}
}
public synchronized void purgeOldSourcesAndAccumulators(final DateTime purgeIfBeforeDate) {
final List oldSourceIds = new ArrayList();
for (final Map.Entry entry : accumulators.entrySet()) {
final int sourceId = entry.getKey();
final SourceAccumulatorsAndUpdateDate accumulatorsAndDate = entry.getValue();
final DateTime lastUpdatedDate = accumulatorsAndDate.getLastUpdateDate();
if (lastUpdatedDate.isBefore(purgeIfBeforeDate)) {
oldSourceIds.add(sourceId);
purgedAccumsBecauseSourceNotUpdated.incrementAndGet();
for (final TimelineSourceEventAccumulator categoryAccumulator : accumulatorsAndDate.getCategoryAccumulators().values()) {
categoryAccumulator.extractAndQueueTimelineChunks();
}
} else {
final List categoryIdsToPurge = new ArrayList();
final Map categoryMap = accumulatorsAndDate.getCategoryAccumulators();
for (final Map.Entry eventEntry : categoryMap.entrySet()) {
final int categoryId = eventEntry.getKey();
final TimelineSourceEventAccumulator categoryAccumulator = eventEntry.getValue();
final DateTime latestTime = categoryAccumulator.getLatestSampleAddTime();
if (latestTime != null && latestTime.isBefore(purgeIfBeforeDate)) {
purgedAccumsBecauseCategoryNotUpdated.incrementAndGet();
categoryAccumulator.extractAndQueueTimelineChunks();
categoryIdsToPurge.add(categoryId);
}
}
for (final int categoryId : categoryIdsToPurge) {
categoryMap.remove(categoryId);
}
}
}
for (final int sourceIdToPurge : oldSourceIds) {
accumulators.remove(sourceIdToPurge);
}
}
/**
* Main entry point to the timeline subsystem. Record a series of sample for a given source, at a given timestamp.
*
* @param sourceName name of the source
* @param eventType event category
* @param eventTimestamp event timestamp
* @param samples samples to record
* @param context the call context
*/
public void record(final String sourceName, final String eventType, final DateTime eventTimestamp,
final Map samples, final CallContext context) {
if (shuttingDown.get()) {
eventsReceivedAfterShuttingDown.incrementAndGet();
return;
}
try {
handledEventCount.incrementAndGet();
// Find the sourceId
final int sourceId = timelineDAO.getOrAddSource(sourceName, context);
// Extract and parse samples
final Map scalarSamples = new LinkedHashMap();
convertSamplesToScalarSamples(eventType, samples, scalarSamples, context);
if (scalarSamples.isEmpty()) {
eventsDiscarded.incrementAndGet();
return;
}
final SourceSamplesForTimestamp sourceSamples = new SourceSamplesForTimestamp(sourceId, eventType, eventTimestamp, scalarSamples);
if (!replaying.get() && config.storeSamplesLocallyTemporary()) {
// Start by saving locally the samples
backingBuffer.append(sourceSamples);
}
// Then add them to the in-memory accumulator
processSamples(sourceSamples, context);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public TimelineSourceEventAccumulator getOrAddSourceEventAccumulator(final int sourceId, final int categoryId, final DateTime firstSampleTime) {
return this.getOrAddSourceEventAccumulator(sourceId, categoryId, firstSampleTime, (int) config.getTimelineLength().getMillis());
}
public synchronized TimelineSourceEventAccumulator getOrAddSourceEventAccumulator(final int sourceId, final int categoryId, final DateTime firstSampleTime, final int timelineLengthMillis) {
SourceAccumulatorsAndUpdateDate sourceAccumulatorsAndUpdateDate = accumulators.get(sourceId);
if (sourceAccumulatorsAndUpdateDate == null) {
addedSourceEventAccumulatorMapCount.incrementAndGet();
sourceAccumulatorsAndUpdateDate = new SourceAccumulatorsAndUpdateDate(new HashMap(), new DateTime());
accumulators.put(sourceId, sourceAccumulatorsAndUpdateDate);
}
sourceAccumulatorsAndUpdateDate.markUpdated();
final Map hostCategoryAccumulators = sourceAccumulatorsAndUpdateDate.getCategoryAccumulators();
TimelineSourceEventAccumulator accumulator = hostCategoryAccumulators.get(categoryId);
if (accumulator == null) {
addedSourceEventAccumulatorCount.incrementAndGet();
accumulator = new TimelineSourceEventAccumulator(timelineDAO, timelineCoder, sampleCoder, backgroundWriter, sourceId, categoryId, firstSampleTime, timelineLengthMillis);
hostCategoryAccumulators.put(categoryId, accumulator);
log.debug("Created new Timeline for sourceId [{}] and category [{}]", sourceId, categoryId);
}
return accumulator;
}
@VisibleForTesting
public void processSamples(final SourceSamplesForTimestamp hostSamples, final TenantContext context) throws ExecutionException, IOException {
final int sourceId = hostSamples.getSourceId();
final String category = hostSamples.getCategory();
final int categoryId = timelineDAO.getEventCategoryId(category, context);
final DateTime timestamp = hostSamples.getTimestamp();
final TimelineSourceEventAccumulator accumulator = getOrAddSourceEventAccumulator(sourceId, categoryId, timestamp);
accumulator.addSourceSamples(hostSamples);
}
public Collection getInMemoryTimelineChunks(final Integer sourceId, @Nullable final DateTime filterStartTime,
@Nullable final DateTime filterEndTime, final TenantContext context) throws IOException, ExecutionException {
return getInMemoryTimelineChunks(sourceId, ImmutableList.copyOf(timelineDAO.getMetrics(context).keySet()), filterStartTime, filterEndTime, context);
}
public Collection getInMemoryTimelineChunks(final Integer sourceId, final Integer metricId, @Nullable final DateTime filterStartTime,
@Nullable final DateTime filterEndTime, final TenantContext context) throws IOException, ExecutionException {
return getInMemoryTimelineChunks(sourceId, ImmutableList.of(metricId), filterStartTime, filterEndTime, context);
}
public synchronized Collection getInMemoryTimelineChunks(final Integer sourceId, final List metricIds,
@Nullable final DateTime filterStartTime, @Nullable final DateTime filterEndTime,
final TenantContext context) throws IOException, ExecutionException {
getInMemoryChunksCallCount.incrementAndGet();
// Check first if there is an in-memory accumulator for this host
final SourceAccumulatorsAndUpdateDate sourceAccumulatorsAndDate = accumulators.get(sourceId);
if (sourceAccumulatorsAndDate == null) {
return ImmutableList.of();
}
// Now, filter each accumulator for this host
final List samplesBySourceName = new ArrayList();
for (final TimelineSourceEventAccumulator accumulator : sourceAccumulatorsAndDate.getCategoryAccumulators().values()) {
// Check if the time filters apply
if ((filterStartTime != null && accumulator.getEndTime().isBefore(filterStartTime)) || (filterEndTime != null && accumulator.getStartTime().isAfter(filterEndTime))) {
// Nope - ignore this accumulator
continue;
}
samplesBySourceName.addAll(accumulator.getInMemoryTimelineChunks(metricIds));
}
inMemoryChunksReturnedCount.addAndGet(samplesBySourceName.size());
Collections.sort(samplesBySourceName, CHUNK_COMPARATOR);
return samplesBySourceName;
}
@VisibleForTesting
void convertSamplesToScalarSamples(final String eventType, final Map inputSamples,
final Map outputSamples, final CallContext context) {
if (inputSamples == null) {
return;
}
final Integer eventCategoryId = timelineDAO.getOrAddEventCategory(eventType, context);
for (final String attributeName : inputSamples.keySet()) {
final Integer metricId = timelineDAO.getOrAddMetric(eventCategoryId, attributeName, context);
final Object sample = inputSamples.get(attributeName);
outputSamples.put(metricId, ScalarSample.fromObject(sample));
}
}
public void replay(final String spoolDir, final CallContext context) {
replayCount.incrementAndGet();
log.info("Starting replay of files in {}", spoolDir);
final Replayer replayer = new Replayer(spoolDir);
StartTimes lastStartTimes = null;
if (shutdownSaveMode == ShutdownSaveMode.SAVE_START_TIMES) {
lastStartTimes = timelineDAO.getLastStartTimes(context);
if (lastStartTimes == null) {
log.info("Did not find startTimes");
} else {
log.info("Retrieved startTimes from the db");
}
}
final StartTimes startTimes = lastStartTimes;
final DateTime minStartTime = lastStartTimes == null ? null : startTimes.getMinStartTime();
final long found = replaySamplesFoundCount.get();
final long outsideTimeRange = replaySamplesOutsideTimeRangeCount.get();
final long processed = replaySamplesProcessedCount.get();
try {
// Read all files in the spool directory and delete them after process, if
// startTimes is null.
replaying.set(true);
final int filesSkipped = replayer.readAll(startTimes == null, minStartTime, new Function() {
@Override
public Void apply(@Nullable final SourceSamplesForTimestamp hostSamples) {
if (hostSamples != null) {
replaySamplesFoundCount.incrementAndGet();
boolean useSamples = true;
try {
final int sourceId = hostSamples.getSourceId();
final String category = hostSamples.getCategory();
final int categoryId = timelineDAO.getEventCategoryId(category, context);
// If startTimes is non-null and the samples come from before the first time for
// the given host and event category, ignore the samples
if (startTimes != null) {
final DateTime timestamp = hostSamples.getTimestamp();
final DateTime categoryStartTime = startTimes.getStartTimeForSourceIdAndCategoryId(sourceId, categoryId);
if (timestamp == null ||
timestamp.isBefore(startTimes.getMinStartTime()) ||
(categoryStartTime != null && timestamp.isBefore(categoryStartTime))) {
replaySamplesOutsideTimeRangeCount.incrementAndGet();
useSamples = false;
}
}
if (useSamples) {
replaySamplesProcessedCount.incrementAndGet();
processSamples(hostSamples, context);
}
} catch (Exception e) {
log.warn("Got exception replaying sample, data potentially lost! {}", hostSamples.toString());
}
}
return null;
}
});
if (shutdownSaveMode == ShutdownSaveMode.SAVE_START_TIMES) {
timelineDAO.deleteLastStartTimes(context);
log.info("Deleted old startTimes");
}
log.info(String.format("Replay completed; %d files skipped, samples read %d, samples outside time range %d, samples used %d",
filesSkipped, replaySamplesFoundCount.get() - found, replaySamplesOutsideTimeRangeCount.get() - outsideTimeRange, replaySamplesProcessedCount.get() - processed));
} catch (RuntimeException e) {
// Catch the exception to make the collector start properly
log.error("Ignoring error when replaying the data", e);
} finally {
replaying.set(false);
}
}
public void forceCommit() {
forceCommitCallCount.incrementAndGet();
saveAccumulators();
discardBackingBuffer();
log.info("Timelines committed");
}
public void commitAndShutdown(final CallContext context) {
shuttingDown.set(true);
final boolean doingFastShutdown = shutdownSaveMode == ShutdownSaveMode.SAVE_START_TIMES;
if (doingFastShutdown) {
final StartTimes startTimes = new StartTimes();
saveStartTimes(startTimes);
timelineDAO.insertLastStartTimes(startTimes, context);
log.info("During shutdown, saved timeline start times in the db");
} else {
saveAccumulators();
log.info("During shutdown, saved timeline accumulators");
}
performShutdown();
discardBackingBuffer();
}
private void discardBackingBuffer() {
if (config.storeSamplesLocallyTemporary()) {
backingBuffer.discard();
}
}
private void performShutdown() {
backgroundWriter.initiateShutdown();
while (!backgroundWriter.getShutdownFinished()) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
purgeThread.shutdown();
}
private synchronized void purgeFilesAndAccumulators() {
this.purgeFilesAndAccumulators(new DateTime().minus(config.getTimelineLength().getMillis()), new DateTime().minus(2 * config.getTimelineLength().getMillis()));
}
// TODO: We have a bad interaction between startTimes and purging: If the system is down
// for two hours, we may not want it to purge everything. Figure out what to do about this.
private synchronized void purgeFilesAndAccumulators(final DateTime purgeAccumulatorsIfBefore, final DateTime purgeFilesIfBefore) {
purgeOldSourcesAndAccumulators(purgeAccumulatorsIfBefore);
final Replayer replayer = new Replayer(config.getSpoolDir());
replayer.purgeOldFiles(purgeFilesIfBefore);
}
public void startPurgeThread() {
purgeThread.scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
purgeFilesAndAccumulators();
}
}, config.getTimelineLength().getMillis(),
config.getTimelineLength().getMillis(),
TimeUnit.MILLISECONDS);
}
// We use the lastUpdateDate to purge sources and their accumulators from the map
private static class SourceAccumulatorsAndUpdateDate {
private final Map categoryAccumulators;
private DateTime lastUpdateDate;
public SourceAccumulatorsAndUpdateDate(final Map categoryAccumulators, final DateTime lastUpdateDate) {
this.categoryAccumulators = categoryAccumulators;
this.lastUpdateDate = lastUpdateDate;
}
public Map getCategoryAccumulators() {
return categoryAccumulators;
}
public DateTime getLastUpdateDate() {
return lastUpdateDate;
}
public void markUpdated() {
lastUpdateDate = new DateTime();
}
}
@VisibleForTesting
public Collection getAccumulators() {
final List inMemoryAccumulator = new ArrayList();
for (final SourceAccumulatorsAndUpdateDate sourceEventAccumulatorMap : accumulators.values()) {
inMemoryAccumulator.addAll(sourceEventAccumulatorMap.getCategoryAccumulators().values());
}
return inMemoryAccumulator;
}
@VisibleForTesting
public FileBackedBuffer getBackingBuffer() {
return backingBuffer;
}
public long getEventsDiscarded() {
return eventsDiscarded.get();
}
public long getSourceEventAccumulatorCount() {
return accumulators.size();
}
public long getEventsReceivedAfterShuttingDown() {
return eventsReceivedAfterShuttingDown.get();
}
public long getHandledEventCount() {
return handledEventCount.get();
}
public long getAddedSourceEventAccumulatorMapCount() {
return addedSourceEventAccumulatorMapCount.get();
}
public long getAddedSourceEventAccumulatorCount() {
return addedSourceEventAccumulatorCount.get();
}
public long getGetInMemoryChunksCallCount() {
return getInMemoryChunksCallCount.get();
}
public long getAccumulatorDeepCopyCount() {
return accumulatorDeepCopyCount.get();
}
public long getInMemoryChunksReturnedCount() {
return inMemoryChunksReturnedCount.get();
}
public long getReplayCount() {
return replayCount.get();
}
public long getReplaySamplesFoundCount() {
return replaySamplesFoundCount.get();
}
public long getReplaySamplesOutsideTimeRangeCount() {
return replaySamplesOutsideTimeRangeCount.get();
}
public long getReplaySamplesProcessedCount() {
return replaySamplesProcessedCount.get();
}
public long getForceCommitCallCount() {
return forceCommitCallCount.get();
}
public long getPurgedAccumsBecauseSourceNotUpdated() {
return purgedAccumsBecauseSourceNotUpdated.get();
}
public long getPurgedAccumsBecauseCategoryNotUpdated() {
return purgedAccumsBecauseCategoryNotUpdated.get();
}
}
