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package org.glassfish.jersey.server.internal.monitoring;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicReference;
import org.glassfish.jersey.server.model.ResourceMethod;
import org.glassfish.jersey.server.monitoring.ExecutionStatistics;
import org.glassfish.jersey.server.monitoring.ResourceMethodStatistics;
/**
* Immutable resource method statistics.
*
* @author Miroslav Fuksa
* @author Stepan Vavra (stepan.vavra at oracle.com)
*/
final class ResourceMethodStatisticsImpl implements ResourceMethodStatistics {
/**
* Factory for creating and storing resource method statistics. One instance per resource method.
*
* Must be thread-safe.
*/
static class Factory {
private final ConcurrentMap stringToMethodsBuilders = new ConcurrentHashMap<>();
ResourceMethodStatisticsImpl.Builder getOrCreate(final ResourceMethod resourceMethod) {
final String methodUniqueId = MonitoringUtils.getMethodUniqueId(resourceMethod);
if (!stringToMethodsBuilders.containsKey(methodUniqueId)) {
stringToMethodsBuilders.putIfAbsent(methodUniqueId, new ResourceMethodStatisticsImpl.Builder(resourceMethod));
}
return stringToMethodsBuilders.get(methodUniqueId);
}
}
/**
* Builder of resource method statistics.
*
* Must be thread-safe.
*/
static class Builder {
private final ResourceMethod resourceMethod;
private final AtomicReference resourceMethodExecutionStatisticsBuilder = new
AtomicReference<>();
private final AtomicReference requestExecutionStatisticsBuilder = new
AtomicReference<>();
private volatile ResourceMethodStatisticsImpl cached;
/**
* Create a new builder instance.
*
* @param resourceMethod Resource method for which statistics are evaluated.
*/
Builder(final ResourceMethod resourceMethod) {
this.resourceMethod = resourceMethod;
}
/**
* Build an instance of resource method statistics.
*
* @return New instance of resource method statistics.
*/
ResourceMethodStatisticsImpl build() {
ResourceMethodStatisticsImpl cachedLocalReference = cached;
if (cachedLocalReference != null) {
return cachedLocalReference;
}
final ExecutionStatistics methodStats = resourceMethodExecutionStatisticsBuilder.get() == null
? ExecutionStatisticsImpl.EMPTY : resourceMethodExecutionStatisticsBuilder.get().build();
final ExecutionStatistics requestStats = requestExecutionStatisticsBuilder.get() == null
? ExecutionStatisticsImpl.EMPTY : requestExecutionStatisticsBuilder.get().build();
final ResourceMethodStatisticsImpl stats = new ResourceMethodStatisticsImpl(resourceMethod, methodStats,
requestStats);
if (MonitoringUtils.isCacheable(methodStats)) {
// overwrite the cache regardless of whether it's null or not
cached = stats;
}
return stats;
}
/**
* Add execution of the resource method to the statistics.
*
* @param methodStartTime Time spent on execution of resource method itself (Unix timestamp format).
* @param methodDuration Time of execution of the resource method.
* @param requestStartTime Time of whole request processing (from receiving the request until writing the response). (Unix
* timestamp format)
* @param requestDuration Time when the request matching to the executed resource method has been received by Jersey.
*/
void addResourceMethodExecution(final long methodStartTime, final long methodDuration, final long requestStartTime,
final long requestDuration) {
cached = null;
if (resourceMethodExecutionStatisticsBuilder.get() == null) {
resourceMethodExecutionStatisticsBuilder.compareAndSet(null, new ExecutionStatisticsImpl.Builder());
}
resourceMethodExecutionStatisticsBuilder.get().addExecution(methodStartTime, methodDuration);
if (requestExecutionStatisticsBuilder.get() == null) {
requestExecutionStatisticsBuilder.compareAndSet(null, new ExecutionStatisticsImpl.Builder());
}
requestExecutionStatisticsBuilder.get().addExecution(requestStartTime, requestDuration);
}
}
private final ExecutionStatistics resourceMethodExecutionStatistics;
private final ExecutionStatistics requestExecutionStatistics;
private final ResourceMethod resourceMethod;
private ResourceMethodStatisticsImpl(final ResourceMethod resourceMethod,
final ExecutionStatistics resourceMethodExecutionStatistics,
final ExecutionStatistics requestExecutionStatistics) {
this.resourceMethod = resourceMethod;
this.resourceMethodExecutionStatistics = resourceMethodExecutionStatistics;
this.requestExecutionStatistics = requestExecutionStatistics;
}
@Override
public ExecutionStatistics getRequestStatistics() {
return requestExecutionStatistics;
}
@Override
public ExecutionStatistics getMethodStatistics() {
return resourceMethodExecutionStatistics;
}
public ResourceMethod getResourceMethod() {
return resourceMethod;
}
@Override
public ResourceMethodStatistics snapshot() {
// this object is immutable (not considering ResourceMethod which is not a monitoring object)
return this;
}
}