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package org.glassfish.jersey.server.internal.monitoring;
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.TimeWindowStatistics;
/**
* Monitoring helper class that contains utility methods used in
* Monitoring.
*
* @author Miroslav Fuksa
*/
public final class MonitoringUtils {
/**
* Request rate limit (per second) below which statistics can be considered as cacheable.
*/
private static final double CACHEABLE_REQUEST_RATE_LIMIT = 0.001;
/**
* Get the method unique string ID. The ID is constructed from method attributes separated
* by pipe '|'. The attributes are used in the following order:
* method-produces|method-consumes|http-method|method-path|method-java-name
*
* If any of the attributes is not defined, "null" is used for such an attribute.
*
*
* @param method Resource method.
* @return String constructed from resource method parameters.
*/
public static String getMethodUniqueId(final ResourceMethod method) {
final String path = method.getParent() != null ? createPath(method.getParent()) : "null";
return method.getProducedTypes().toString() + "|"
+ method.getConsumedTypes().toString() + "|"
+ method.getHttpMethod() + "|"
+ path + "|"
+ method.getInvocable().getHandlingMethod().getName();
}
private static String createPath(Resource resource) {
return appendPath(resource, new StringBuilder()).toString();
}
private static StringBuilder appendPath(Resource resource, StringBuilder path) {
return resource.getParent() == null ? path.append(resource.getPath())
: appendPath(resource.getParent(), path).append(".").append(resource.getPath());
}
/**
* Indicates whether the global, resource, resource method statistics containing the give execution statistics can
* be cached.
*
* @param stats execution statistics to be examined.
* @return {@code true} if the statistics can be cached, {@code false} otherwise.
*/
static boolean isCacheable(final ExecutionStatistics stats) {
for (final TimeWindowStatistics window : stats.getTimeWindowStatistics().values()) {
if (window.getRequestsPerSecond() >= CACHEABLE_REQUEST_RATE_LIMIT) {
return false;
}
}
return true;
}
/**
* Prevent instantiation.
*/
private MonitoringUtils() {
}
}