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/*
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*
* Copyright (c) 2020-2023 Payara Foundation and/or its affiliates. All rights reserved.
*
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* General Public License Version 2 only ("GPL") or the Common Development
* 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
* https://github.com/payara/Payara/blob/master/LICENSE.txt
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*
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* file and include the License file at glassfish/legal/LICENSE.txt.
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package fish.payara.microprofile.metrics;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import org.eclipse.microprofile.metrics.MetricRegistry;
import org.jvnet.hk2.annotations.Contract;
import fish.payara.microprofile.metrics.exception.NoSuchRegistryException;
/**
* The API to use {@link MetricRegistry}s within an multi-application environment.
*
* The main purpose of this API is to cleanly decouple the users from the service provider and to avoid API pollution
* with methods that might be added to test or integrate the implementation but should not be called anywhere else.
*
* @author Jan Bernitt
*
* @since 5.2020.8
*/
@Contract
public interface MetricsService {
/**
* When metrics are disabled no {@link MetricsContext} exists, both {@link #getContext(boolean)} and
* {@link #getContext(String)} will return null.
*
* @return true if the metrics feature is generally enabled, else false
*/
boolean isEnabled();
/**
* Triggers update of internal state usually used after configuration changes that can have the effect that metrics
* appear or disappear in a way that is detected by the registry.
*/
void refresh();
/**
* @return a set of all {@link MetricsContext} that currently exist. When applications are undeployed their
* {@link MetricsContext} equally are removed which means a name from the set of names returned may indeed
* no longer exists when using {@link #getContext(boolean)}.
*/
Set getContextNames();
/**
* Access current application metric context. If this is called from a context that is not linked to an application
* context the server context is returned.
*
* @param createIfNotExists true to create the requested context in case it did not exist, false to instead return
* null in that case
* @return the existing or created context or null if it did not exist and parameter was false or if the servicenot
* {@link #isEnabled()}
*/
MetricsContext getContext(boolean createIfNotExists);
/**
* Access the context by name. Implicitly creates the {@link MetricsContext#SERVER_CONTEXT_NAME} if needed but no
* other context that does not exist yet or no more.
*
* @param name the name of the {@link MetricsContext} to provide, this assumes it does exist
* @return the existing context or null if it does not (or no longer) exist. When the service not
* {@link #isEnabled()} no context exists. Otherwise when asking for the
* {@link MetricsContext#SERVER_CONTEXT_NAME} the context is created should it not exist yet.
*/
MetricsContext getContext(String name);
/**
* Each deployed application has its own {@link MetricsContext}.
* In addition there is the server context which has no name as indicated by {@link #isServerContext()}.
*
* @author Jan Bernitt
*/
interface MetricsContext {
/**
* The global or server context name cannot have any name but the empty string as all other names potentially
* are application names used by deployed applications.
*/
String SERVER_CONTEXT_NAME = "";
/**
* @return the name of this context which is either the name of the application this context is linked to or the
* empty string in case of the server context
*/
String getName();
default boolean isServerContext() {
return SERVER_CONTEXT_NAME.equals(getName());
}
MetricRegistry getOrCreateRegistry(String registryName) throws NoSuchRegistryException;
default MetricRegistry getBaseRegistry() {
return getOrCreateRegistry(MetricRegistry.BASE_SCOPE);
}
default MetricRegistry getVendorRegistry() {
return getOrCreateRegistry(MetricRegistry.VENDOR_SCOPE);
}
default MetricRegistry getApplicationRegistry() throws NoSuchRegistryException {
return getOrCreateRegistry(MetricRegistry.APPLICATION_SCOPE);
}
ConcurrentMap getRegistries();
}
}