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/*
* Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.internal.diagnostics;
import com.hazelcast.instance.HazelcastThreadGroup;
import com.hazelcast.internal.metrics.ProbeLevel;
import com.hazelcast.logging.ILogger;
import com.hazelcast.spi.properties.HazelcastProperties;
import com.hazelcast.spi.properties.HazelcastProperty;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicReference;
import static com.hazelcast.internal.diagnostics.DiagnosticsPlugin.DISABLED;
import static com.hazelcast.util.Preconditions.checkNotNull;
import static java.lang.System.arraycopy;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
/**
* The {@link Diagnostics} is a debugging tool that provides insight in all kinds of potential performance and stability issues.
* The actual logic to provide such insights, is placed in the {@link DiagnosticsPlugin}.
*/
public class Diagnostics {
public static final String PREFIX = "hazelcast.diagnostics";
/**
* The minimum level for probes is MANDATORY, but it can be changed to INFO or DEBUG. A lower level will increase
* memory usage (probably just a few 100KB) and provides much greater detail on what is going on inside a HazelcastInstance.
*
* By default only mandatory probes are being tracked
*/
public static final HazelcastProperty METRICS_LEVEL =
new HazelcastProperty(PREFIX + ".metric.level", ProbeLevel.MANDATORY.name())
.setDeprecatedName("hazelcast.performance.metric.level");
/**
* Use the {@link Diagnostics} to see internal performance metrics and cluster related information.
*
* The performance monitor logs all metrics into the log file.
*
* For more detailed information, please check the METRICS_LEVEL.
*
* The default is false.
*/
public static final HazelcastProperty ENABLED = new HazelcastProperty(PREFIX + ".enabled", false)
.setDeprecatedName("hazelcast.performance.monitoring.enabled");
/**
* The {@link DiagnosticsLogFile} uses a rolling file approach to prevent eating too much disk space.
*
* This property sets the maximum size in MB for a single file.
*
* Every HazelcastInstance will get its own history of log files.
*
* The default is 10.
*/
@SuppressWarnings("checkstyle:magicnumber")
public static final HazelcastProperty MAX_ROLLED_FILE_SIZE_MB = new HazelcastProperty(PREFIX + ".max.rolled.file.size.mb", 10)
.setDeprecatedName("hazelcast.performance.monitor.max.rolled.file.size.mb");
/**
* The {@link DiagnosticsLogFile} uses a rolling file approach to prevent eating too much disk space.
*
* This property sets the maximum number of rolling files to keep on disk.
*
* The default is 10.
*/
@SuppressWarnings("checkstyle:magicnumber")
public static final HazelcastProperty MAX_ROLLED_FILE_COUNT = new HazelcastProperty(PREFIX + ".max.rolled.file.count", 10)
.setDeprecatedName("hazelcast.performance.monitor.max.rolled.file.count");
/**
* Determines if a human friendly, but more difficult to parse, output format is selected for dumping the metrics.
*
* The default is true.
*/
public static final HazelcastProperty HUMAN_FRIENDLY_FORMAT = new HazelcastProperty(PREFIX + ".human.friendly.format", true)
.setDeprecatedName("hazelcast.performance.monitor.human.friendly.format");
/**
* Configures the output directory of the performance log files.
*
* Defaults to the 'user.dir'.
*/
public static final HazelcastProperty DIRECTORY
= new HazelcastProperty(PREFIX + ".directory", "" + System.getProperty("user.dir"));
final boolean singleLine;
final HazelcastProperties properties;
final String directory;
DiagnosticsLogFile diagnosticsLogFile;
final AtomicReference staticTasks = new AtomicReference(
new DiagnosticsPlugin[0]
);
final ILogger logger;
final String fileName;
private final boolean enabled;
private ScheduledExecutorService scheduler;
private final HazelcastThreadGroup hzThreadGroup;
public Diagnostics(String fileName, ILogger logger, HazelcastThreadGroup hzThreadGroup, HazelcastProperties properties) {
this.fileName = fileName;
this.hzThreadGroup = hzThreadGroup;
this.logger = logger;
this.properties = properties;
this.enabled = properties.getBoolean(ENABLED);
this.directory = properties.getString(DIRECTORY);
this.singleLine = !properties.getBoolean(HUMAN_FRIENDLY_FORMAT);
}
/**
* Registers a {@link DiagnosticsPlugin}.
*
* This method is threadsafe.
*
* There is no checking for duplicate registration.
*
* If the {@link Diagnostics} is disabled, the call is ignored.
*
* @param plugin the plugin to register
* @throws NullPointerException if plugin is null.
*/
public void register(DiagnosticsPlugin plugin) {
checkNotNull(plugin, "plugin can't be null");
if (!enabled) {
return;
}
long periodMillis = plugin.getPeriodMillis();
if (periodMillis < -1) {
throw new IllegalArgumentException(plugin + " can't return a periodMillis smaller than -1");
}
logger.finest(plugin.getClass().toString() + " is " + (periodMillis == DISABLED ? "disabled" : "enabled"));
if (periodMillis == DISABLED) {
return;
}
plugin.onStart();
if (periodMillis > 0) {
// it is a periodic task
scheduler.scheduleAtFixedRate(new WritePluginTask(plugin), 0, periodMillis, MILLISECONDS);
} else {
addStaticPlugin(plugin);
}
}
private void addStaticPlugin(DiagnosticsPlugin plugin) {
for (; ; ) {
DiagnosticsPlugin[] oldPlugins = staticTasks.get();
DiagnosticsPlugin[] newPlugins = new DiagnosticsPlugin[oldPlugins.length + 1];
arraycopy(oldPlugins, 0, newPlugins, 0, oldPlugins.length);
newPlugins[oldPlugins.length] = plugin;
if (staticTasks.compareAndSet(oldPlugins, newPlugins)) {
break;
}
}
}
public void start() {
if (!enabled) {
logger.finest("Diagnostics is enabled");
return;
}
this.diagnosticsLogFile = new DiagnosticsLogFile(this);
this.scheduler = new ScheduledThreadPoolExecutor(1, new DiagnosticSchedulerThreadFactory());
logger.info("Diagnostics started");
}
public void shutdown() {
if (!enabled) {
return;
}
if (scheduler != null) {
scheduler.shutdownNow();
}
}
private class WritePluginTask implements Runnable {
private final DiagnosticsPlugin plugin;
WritePluginTask(DiagnosticsPlugin plugin) {
this.plugin = plugin;
}
@Override
public void run() {
try {
diagnosticsLogFile.write(plugin);
} catch (Throwable t) {
// we need to catch any exception; otherwise the task is going to be removed by the scheduler.
logger.severe(t);
}
}
}
private class DiagnosticSchedulerThreadFactory implements ThreadFactory {
@Override
public Thread newThread(Runnable target) {
return new Thread(
hzThreadGroup.getInternalThreadGroup(),
target,
hzThreadGroup.getThreadNamePrefix("DiagnosticsSchedulerThread"));
}
}
}
