/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The SF 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 org.apache.sling.hc.core.impl.executor;
import java.util.Date;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import org.apache.commons.lang.time.StopWatch;
import org.apache.sling.hc.api.HealthCheck;
import org.apache.sling.hc.api.Result;
import org.apache.sling.hc.api.execution.HealthCheckExecutionResult;
import org.apache.sling.hc.util.HealthCheckMetadata;
import org.osgi.framework.BundleContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Future to be able to schedule a health check for parallel execution.
*
*/
class HealthCheckFuture extends FutureTask<ExecutionResult> {
public interface Callback {
public void finished(final HealthCheckExecutionResult result);
}
private final static Logger LOG = LoggerFactory.getLogger(HealthCheckFuture.class);
private final HealthCheckMetadata metadata;
private final Date createdTime;
HealthCheckFuture(final HealthCheckMetadata metadata, final BundleContext bundleContext, final Callback callback) {
super(new Callable<ExecutionResult>() {
@Override
public ExecutionResult call() throws Exception {
Thread.currentThread().setName("HealthCheck " + metadata.getTitle());
LOG.debug("Starting check {}", metadata);
final StopWatch stopWatch = new StopWatch();
stopWatch.start();
Result resultFromHealthCheck = null;
ExecutionResult executionResult = null;
final HealthCheck healthCheck = (HealthCheck) bundleContext.getService(metadata.getServiceReference());
try {
if (healthCheck != null) {
resultFromHealthCheck = healthCheck.execute();
} else {
throw new IllegalStateException("Service for " + metadata + " is gone");
}
} catch (final Exception e) {
resultFromHealthCheck = new Result(Result.Status.CRITICAL, "Exception during execution of " + this + ": " + e, e);
} finally {
// unget service ref
bundleContext.ungetService(metadata.getServiceReference());
// update result with information about this run
stopWatch.stop();
long elapsedTime = stopWatch.getTime();
if (resultFromHealthCheck != null) {
// wrap the result in an execution result
executionResult = new ExecutionResult(metadata, resultFromHealthCheck, elapsedTime);
}
LOG.debug("Time consumed for {}: {}", metadata, HealthCheckExecutorImpl.msHumanReadable(elapsedTime));
}
callback.finished(executionResult);
Thread.currentThread().setName("HealthCheck idle");
return executionResult;
}
});
this.createdTime = new Date();
this.metadata = metadata;
}
Date getCreatedTime() {
return this.createdTime;
}
public HealthCheckMetadata getHealthCheckMetadata() {
return metadata;
}
@Override
public String toString() {
return "[Future for " + this.metadata + ", createdTime=" + this.createdTime + "]";
}
}