io.netty.util.ResourceLeakDetectorFactory Maven / Gradle / Ivy
/*
* Copyright 2016 The Netty Project
*
* The Netty Project 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 io.netty.util;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.lang.reflect.Constructor;
/**
* This static factory should be used to load {@link ResourceLeakDetector}s as needed
*/
public abstract class ResourceLeakDetectorFactory {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(ResourceLeakDetectorFactory.class);
private static volatile ResourceLeakDetectorFactory factoryInstance = new DefaultResourceLeakDetectorFactory();
/**
* Get the singleton instance of this factory class.
*
* @return the current {@link ResourceLeakDetectorFactory}
*/
public static ResourceLeakDetectorFactory instance() {
return factoryInstance;
}
/**
* Set the factory's singleton instance. This has to be called before the static initializer of the
* {@link ResourceLeakDetector} is called by all the callers of this factory. That is, before initializing a
* Netty Bootstrap.
*
* @param factory the instance that will become the current {@link ResourceLeakDetectorFactory}'s singleton
*/
public static void setResourceLeakDetectorFactory(ResourceLeakDetectorFactory factory) {
factoryInstance = ObjectUtil.checkNotNull(factory, "factory");
}
/**
* Returns a new instance of a {@link ResourceLeakDetector} with the given resource class.
*
* @param resource the resource class used to initialize the {@link ResourceLeakDetector}
* @param the type of the resource class
* @return a new instance of {@link ResourceLeakDetector}
*/
public final ResourceLeakDetector newResourceLeakDetector(Class resource) {
return newResourceLeakDetector(resource, ResourceLeakDetector.SAMPLING_INTERVAL);
}
/**
* @deprecated Use {@link #newResourceLeakDetector(Class, int)} instead.
*
* Returns a new instance of a {@link ResourceLeakDetector} with the given resource class.
*
* @param resource the resource class used to initialize the {@link ResourceLeakDetector}
* @param samplingInterval the interval on which sampling takes place
* @param maxActive This is deprecated and will be ignored.
* @param the type of the resource class
* @return a new instance of {@link ResourceLeakDetector}
*/
@Deprecated
public abstract ResourceLeakDetector newResourceLeakDetector(
Class resource, int samplingInterval, long maxActive);
/**
* Returns a new instance of a {@link ResourceLeakDetector} with the given resource class.
*
* @param resource the resource class used to initialize the {@link ResourceLeakDetector}
* @param samplingInterval the interval on which sampling takes place
* @param the type of the resource class
* @return a new instance of {@link ResourceLeakDetector}
*/
@SuppressWarnings("deprecation")
public ResourceLeakDetector newResourceLeakDetector(Class resource, int samplingInterval) {
return newResourceLeakDetector(resource, ResourceLeakDetector.SAMPLING_INTERVAL, Long.MAX_VALUE);
}
/**
* Default implementation that loads custom leak detector via system property
*/
private static final class DefaultResourceLeakDetectorFactory extends ResourceLeakDetectorFactory {
private final Constructor obsoleteCustomClassConstructor;
private final Constructor customClassConstructor;
DefaultResourceLeakDetectorFactory() {
String customLeakDetector;
try {
customLeakDetector = SystemPropertyUtil.get("io.netty.customResourceLeakDetector");
} catch (Throwable cause) {
logger.error("Could not access System property: io.netty.customResourceLeakDetector", cause);
customLeakDetector = null;
}
if (customLeakDetector == null) {
obsoleteCustomClassConstructor = customClassConstructor = null;
} else {
obsoleteCustomClassConstructor = obsoleteCustomClassConstructor(customLeakDetector);
customClassConstructor = customClassConstructor(customLeakDetector);
}
}
private static Constructor obsoleteCustomClassConstructor(String customLeakDetector) {
try {
final Class detectorClass = Class.forName(customLeakDetector, true,
PlatformDependent.getSystemClassLoader());
if (ResourceLeakDetector.class.isAssignableFrom(detectorClass)) {
return detectorClass.getConstructor(Class.class, int.class, long.class);
} else {
logger.error("Class {} does not inherit from ResourceLeakDetector.", customLeakDetector);
}
} catch (Throwable t) {
logger.error("Could not load custom resource leak detector class provided: {}",
customLeakDetector, t);
}
return null;
}
private static Constructor customClassConstructor(String customLeakDetector) {
try {
final Class detectorClass = Class.forName(customLeakDetector, true,
PlatformDependent.getSystemClassLoader());
if (ResourceLeakDetector.class.isAssignableFrom(detectorClass)) {
return detectorClass.getConstructor(Class.class, int.class);
} else {
logger.error("Class {} does not inherit from ResourceLeakDetector.", customLeakDetector);
}
} catch (Throwable t) {
logger.error("Could not load custom resource leak detector class provided: {}",
customLeakDetector, t);
}
return null;
}
@SuppressWarnings("deprecation")
@Override
public ResourceLeakDetector newResourceLeakDetector(Class resource, int samplingInterval,
long maxActive) {
if (obsoleteCustomClassConstructor != null) {
try {
@SuppressWarnings("unchecked")
ResourceLeakDetector leakDetector =
(ResourceLeakDetector) obsoleteCustomClassConstructor.newInstance(
resource, samplingInterval, maxActive);
logger.debug("Loaded custom ResourceLeakDetector: {}",
obsoleteCustomClassConstructor.getDeclaringClass().getName());
return leakDetector;
} catch (Throwable t) {
logger.error(
"Could not load custom resource leak detector provided: {} with the given resource: {}",
obsoleteCustomClassConstructor.getDeclaringClass().getName(), resource, t);
}
}
ResourceLeakDetector resourceLeakDetector = new ResourceLeakDetector(resource, samplingInterval,
maxActive);
logger.debug("Loaded default ResourceLeakDetector: {}", resourceLeakDetector);
return resourceLeakDetector;
}
@Override
public ResourceLeakDetector newResourceLeakDetector(Class resource, int samplingInterval) {
if (customClassConstructor != null) {
try {
@SuppressWarnings("unchecked")
ResourceLeakDetector leakDetector =
(ResourceLeakDetector) customClassConstructor.newInstance(resource, samplingInterval);
logger.debug("Loaded custom ResourceLeakDetector: {}",
customClassConstructor.getDeclaringClass().getName());
return leakDetector;
} catch (Throwable t) {
logger.error(
"Could not load custom resource leak detector provided: {} with the given resource: {}",
customClassConstructor.getDeclaringClass().getName(), resource, t);
}
}
ResourceLeakDetector resourceLeakDetector = new ResourceLeakDetector(resource, samplingInterval);
logger.debug("Loaded default ResourceLeakDetector: {}", resourceLeakDetector);
return resourceLeakDetector;
}
}
}