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/*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
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* file and include the License file at packager/legal/LICENSE.txt.
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package org.glassfish.jersey.server.internal.monitoring;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicReference;
import org.glassfish.jersey.server.model.Resource;
import org.glassfish.jersey.server.model.ResourceMethod;
import org.glassfish.jersey.server.monitoring.ExecutionStatistics;
import org.glassfish.jersey.server.monitoring.ResourceMethodStatistics;
import org.glassfish.jersey.server.monitoring.ResourceStatistics;
import jersey.repackaged.com.google.common.collect.Maps;
/**
* Immutable resource statistics implementation.
*
* @author Miroslav Fuksa
* @author Stepan Vavra (stepan.vavra at oracle.com)
*/
final class ResourceStatisticsImpl implements ResourceStatistics {
/**
* Builder of resource statistics instances.
*
* Must be thread-safe.
*/
static class Builder {
private final ConcurrentMap methodsBuilders = new ConcurrentHashMap<>();
private final ResourceMethodStatisticsImpl.Factory methodFactory;
private final AtomicReference resourceExecutionStatisticsBuilder = new
AtomicReference<>();
private final AtomicReference requestExecutionStatisticsBuilder = new
AtomicReference<>();
private volatile ResourceStatisticsImpl cached;
/**
* Create a new builder.
*
* @param resource Resource for which the instance is created.
*/
Builder(final Resource resource, final ResourceMethodStatisticsImpl.Factory methodFactory) {
this(methodFactory);
for (final ResourceMethod method : resource.getResourceMethods()) {
getOrCreate(method);
}
}
/**
* Create a new builder.
*/
Builder(final ResourceMethodStatisticsImpl.Factory methodFactory) {
this.methodFactory = methodFactory;
}
/**
* Build a new instance of {@link ResourceStatisticsImpl}.
*
* Note that this build method is called from various different threads.
*
* @return New instance of resource statistics.
*/
ResourceStatisticsImpl build() {
ResourceStatisticsImpl cachedReference = cached;
if (cachedReference != null) {
return cachedReference;
}
final Map resourceMethods = Maps.newHashMap();
for (final ResourceMethodStatisticsImpl.Builder builder : methodsBuilders.keySet()) {
final ResourceMethodStatisticsImpl stats = builder.build();
resourceMethods.put(stats.getResourceMethod(), stats);
}
final ExecutionStatistics resourceStats = resourceExecutionStatisticsBuilder.get() == null
? ExecutionStatisticsImpl.EMPTY : resourceExecutionStatisticsBuilder.get().build();
final ExecutionStatistics requestStats = requestExecutionStatisticsBuilder.get() == null
? ExecutionStatisticsImpl.EMPTY : requestExecutionStatisticsBuilder.get().build();
final ResourceStatisticsImpl stats = new ResourceStatisticsImpl(resourceMethods,
resourceStats, requestStats);
if (MonitoringUtils.isCacheable(requestStats)) {
cached = stats;
}
return stats;
}
/**
* Add execution of a resource method in the resource.
*
* @param resourceMethod Resource method executed.
* @param methodStartTime Time of execution of the resource method.
* @param methodDuration Time spent on execution of resource method itself.
* @param requestStartTime Time when the request matching to the executed resource method has been received by Jersey.
* @param requestDuration Time of whole request processing (from receiving the request until writing the response).
*/
void addExecution(final ResourceMethod resourceMethod, final long methodStartTime, final long methodDuration,
final long requestStartTime, final long requestDuration) {
cached = null;
if (resourceExecutionStatisticsBuilder.get() == null) {
resourceExecutionStatisticsBuilder.compareAndSet(null, new ExecutionStatisticsImpl.Builder());
}
resourceExecutionStatisticsBuilder.get().addExecution(methodStartTime, methodDuration);
if (requestExecutionStatisticsBuilder.get() == null) {
requestExecutionStatisticsBuilder.compareAndSet(null, new ExecutionStatisticsImpl.Builder());
}
requestExecutionStatisticsBuilder.get().addExecution(requestStartTime, requestDuration);
addMethod(resourceMethod);
}
/**
* Add a resource method to the statistics.
*
* @param resourceMethod Resource method.
*/
void addMethod(final ResourceMethod resourceMethod) {
cached = null;
getOrCreate(resourceMethod);
}
private ResourceMethodStatisticsImpl.Builder getOrCreate(final ResourceMethod resourceMethod) {
final ResourceMethodStatisticsImpl.Builder methodStats = methodFactory.getOrCreate(resourceMethod);
methodsBuilders.putIfAbsent(methodStats, Boolean.TRUE);
return methodStats;
}
}
private final Map resourceMethods;
private final ExecutionStatistics resourceExecutionStatistics;
private final ExecutionStatistics requestExecutionStatistics;
private ResourceStatisticsImpl(final Map resourceMethods,
final ExecutionStatistics resourceExecutionStatistics,
final ExecutionStatistics requestExecutionStatistics) {
this.resourceMethods = Collections.unmodifiableMap(resourceMethods);
this.resourceExecutionStatistics = resourceExecutionStatistics;
this.requestExecutionStatistics = requestExecutionStatistics;
}
@Override
public ExecutionStatistics getResourceMethodExecutionStatistics() {
return resourceExecutionStatistics;
}
@Override
public ExecutionStatistics getRequestExecutionStatistics() {
return requestExecutionStatistics;
}
@Override
public Map getResourceMethodStatistics() {
return resourceMethods;
}
@Override
public ResourceStatistics snapshot() {
// this object is immutable and all the other accessible objects as well
return this;
}
}