/*
* ModeShape (http://www.modeshape.org)
*
* 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.modeshape.jboss.metric;
import org.jboss.as.controller.AbstractRuntimeOnlyHandler;
import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.dmr.ModelNode;
import org.jboss.logging.Logger;
import org.jboss.msc.service.ServiceController;
import org.modeshape.common.util.CheckArg;
import org.modeshape.jboss.subsystem.AddressContext;
import org.modeshape.jboss.subsystem.ModeShapeServiceNames;
import org.modeshape.jcr.api.monitor.History;
import org.modeshape.jcr.api.monitor.RepositoryMonitor;
import org.modeshape.jcr.api.monitor.Statistics;
import org.modeshape.jcr.api.monitor.Window;
/**
* Represents either a ModeShape value or duration metric operation.
*/
public abstract class ModeShapeMetricHandler extends AbstractRuntimeOnlyHandler {
/**
* Will be <code>null</code> until {@link ModeShapeMetricHandler#logger()} is called.
*/
private Logger logger;
private final Window window;
/**
* @param metricWindow the metric window (cannot be <code>null</code>)
*/
protected ModeShapeMetricHandler( final Window metricWindow ) {
CheckArg.isNotNull(metricWindow, "metricWindow");
this.window = metricWindow;
}
/**
* @see org.jboss.as.controller.AbstractRuntimeOnlyHandler#executeRuntimeStep(org.jboss.as.controller.OperationContext,
* org.jboss.dmr.ModelNode)
*/
@Override
protected void executeRuntimeStep( final OperationContext context,
final ModelNode operation ) throws OperationFailedException {
AddressContext addressContext = AddressContext.forOperation(operation);
final String repositoryName = addressContext.repositoryName();
final ServiceController<?> sc = context.getServiceRegistry(false).getService(ModeShapeServiceNames.monitorServiceName(repositoryName));
if (sc == null) {
logger().debugv("ModeShape metric handler for repository {0} ignoring runtime step because the monitoring service is unavailable." +
"Most likely the repository has been removed", repositoryName);
return;
}
final RepositoryMonitor repoStats = (RepositoryMonitor)sc.getValue();
try {
final History history = history(repoStats);
final Statistics[] stats = history.getStats();
if ((stats.length != 0) && (stats[stats.length - 1] != null)) {
final ModelNode result = context.getResult();
for (final Statistics sample : stats) {
// sample can be null if the window is larger than the repository uptime
if (sample != null) {
result.add(sample.getMaximum());
}
}
}
} catch (final Exception e) {
throw new OperationFailedException(e);
}
}
/**
* @param repoStats the repository statistics used to obtain the metric history (cannot be <code>null</code>)
* @return the requested metric history (never <code>null</code> but can be empty)
* @throws Exception if there is a problem obtaining the repository statistics history
*/
protected abstract History history( final RepositoryMonitor repoStats ) throws Exception;
/**
* @return the logger (never <code>null</code>)
*/
protected final Logger logger() {
if (this.logger == null) {
this.logger = Logger.getLogger(getClass().getName());
}
return this.logger;
}
/**
* @return the metrics window (never <code>null</code>)
*/
protected Window window() {
return this.window;
}
}