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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
* 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 org.databene.commons.debug;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Class that monitors resources as a collection of {@link MonitoredResource}s.
* Resources are registered and unregistered with {@link #register(Object)} and
* {@link #unregister(Object)} and in the end you can assert that all resources
* have been unregistered by calling {@link #assertNoRegistrations(boolean)}.
* Created: 14.04.2011 17:16:20
* @since 0.5.8
* @author Volker Bergmann
*/
public class ResourceMonitor {
private static final Logger LOGGER = LoggerFactory.getLogger(ResourceMonitor.class);
private List registrations;
public ResourceMonitor() {
registrations = new ArrayList();
}
public void register(Object object) {
Throwable t = new Throwable();
registrations.add(new MonitoredResource(object, t.getStackTrace()));
}
public void unregister(Object object) {
for (int i = registrations.size() - 1; i >= 0; i--) {
MonitoredResource candidate = registrations.get(i);
if (candidate.resource == object) {
registrations.remove(i);
return;
}
}
throw new IllegalStateException("Object '" + object + "' was not registered");
}
public List getRegistrations() {
return registrations;
}
public void reset() {
this.registrations.clear();
}
public boolean assertNoRegistrations(boolean critical) {
if (registrations.size() == 0)
return true;
String message = "There are resources which have not been unregistered:";
LOGGER.warn(message);
logRegistrations();
if (critical)
throw new IllegalStateException(message);
return false;
}
private void logRegistrations() {
for (MonitoredResource resource : registrations) {
LOGGER.warn(resource.toString());
}
}
}