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Capture stack traces for multiple threads at once to reduce number of safe points needed.
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131
core/src/main/java/org/glowroot/collector/StackTraceCollector.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /* | ||
| * Copyright 2011-2014 the original author or authors. | ||
| * | ||
| * 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 org.glowroot.collector; | ||
|
|
||
| import java.lang.management.ManagementFactory; | ||
| import java.lang.management.ThreadInfo; | ||
| import java.util.List; | ||
| import java.util.concurrent.Future; | ||
| import java.util.concurrent.ScheduledExecutorService; | ||
|
|
||
| import com.google.common.collect.ImmutableList; | ||
| import org.checkerframework.checker.nullness.qual.Nullable; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import org.glowroot.api.PluginServices.ConfigListener; | ||
| import org.glowroot.config.ConfigService; | ||
| import org.glowroot.config.ProfilingConfig; | ||
| import org.glowroot.markers.OnlyUsedByTests; | ||
| import org.glowroot.markers.Singleton; | ||
| import org.glowroot.transaction.TransactionRegistry; | ||
| import org.glowroot.transaction.model.Transaction; | ||
|
|
||
| import static java.util.concurrent.TimeUnit.MILLISECONDS; | ||
|
|
||
| /** | ||
| * @author Trask Stalnaker | ||
| * @since 0.5 | ||
| */ | ||
| @Singleton | ||
| class StackTraceCollector implements Runnable { | ||
|
|
||
| private static final Logger logger = LoggerFactory.getLogger(StackTraceCollector.class); | ||
|
|
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| private final TransactionRegistry transactionRegistry; | ||
| private final ConfigService configService; | ||
| private final ScheduledExecutorService scheduledExecutor; | ||
|
|
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| private volatile boolean currentEnabled; | ||
| private volatile int currentIntervalMillis; | ||
| @Nullable | ||
| private volatile Future<?> currentFuture; | ||
|
|
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| public static StackTraceCollector create(TransactionRegistry transactionRegistry, | ||
| ConfigService configService, ScheduledExecutorService scheduledExecutor) { | ||
| final StackTraceCollector stackTraceCollector = | ||
| new StackTraceCollector(transactionRegistry, configService, scheduledExecutor); | ||
| configService.addConfigListener(new ConfigListener() { | ||
| @Override | ||
| public void onChange() { | ||
| stackTraceCollector.updateScheduleIfNeeded(); | ||
| } | ||
| }); | ||
| stackTraceCollector.updateScheduleIfNeeded(); | ||
| return stackTraceCollector; | ||
| } | ||
|
|
||
| private StackTraceCollector(TransactionRegistry transactionRegistry, | ||
| final ConfigService configService, ScheduledExecutorService scheduledExecutor) { | ||
| this.transactionRegistry = transactionRegistry; | ||
| this.configService = configService; | ||
| this.scheduledExecutor = scheduledExecutor; | ||
| } | ||
|
|
||
| @Override | ||
| public void run() { | ||
| try { | ||
| runInternal(); | ||
| } catch (Throwable t) { | ||
| logger.error(t.getMessage(), t); | ||
| } | ||
| } | ||
|
|
||
| void updateScheduleIfNeeded() { | ||
| boolean newEnabled = configService.getProfilingConfig().isEnabled(); | ||
| int newIntervalMillis = configService.getProfilingConfig().getIntervalMillis(); | ||
| if (newEnabled != currentEnabled || newIntervalMillis != currentIntervalMillis) { | ||
| if (currentFuture != null) { | ||
| currentFuture.cancel(false); | ||
| } | ||
| if (newEnabled) { | ||
| currentFuture = scheduledExecutor.scheduleAtFixedRate(this, newIntervalMillis, | ||
| newIntervalMillis, MILLISECONDS); | ||
| } | ||
| currentEnabled = newEnabled; | ||
| currentIntervalMillis = newIntervalMillis; | ||
| } | ||
| } | ||
|
|
||
| private void runInternal() { | ||
| ProfilingConfig config = configService.getProfilingConfig(); | ||
| if (!config.isEnabled()) { | ||
| return; | ||
| } | ||
| List<Transaction> transactions = | ||
| ImmutableList.copyOf(transactionRegistry.getTransactions()); | ||
| if (transactions.isEmpty()) { | ||
| return; | ||
| } | ||
| long[] threadIds = new long[transactions.size()]; | ||
| for (int i = 0; i < transactions.size(); i++) { | ||
| threadIds[i] = transactions.get(i).getThreadId(); | ||
| } | ||
| ThreadInfo[] threadInfos = | ||
| ManagementFactory.getThreadMXBean().getThreadInfo(threadIds, Integer.MAX_VALUE); | ||
| for (int i = 0; i < transactions.size(); i++) { | ||
| transactions.get(i).captureStackTrace(threadInfos[i], false, | ||
| configService.getAdvancedConfig().getMaxStackTraceSamplesPerTransaction()); | ||
| } | ||
| } | ||
|
|
||
| @OnlyUsedByTests | ||
| void close() { | ||
| if (currentFuture != null) { | ||
| currentFuture.cancel(false); | ||
| } | ||
| } | ||
| } |
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