package org.jolokia.detector;
/*
* Copyright 2009-2013 Roland Huss
*
* Licensed 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.
*/
import java.lang.instrument.Instrumentation;
import java.util.Set;
import javax.management.MBeanServerConnection;
import org.jolokia.backend.executor.MBeanServerExecutor;
/**
* A detector identifies a specific server. This is typically done by inspecting
* the runtime environment e.g. for the existence of certain classes. If a detector
* successfully detect 'its' server, it return a {@link ServerHandle} containing type, version
* and some optional information. For the early detection of a server by the JVM agent,
* {@link #jvmAgentStartup(Instrumentation)} and {@link #awaitServerInitialization} can
* be used. Using these methods is useful in case the server is using its own class
* loaders to load components used by Jolokia (e.g jmx, Java logging which is
* indirectly required by the sun.net.httpserver).
*
* @author roland
* @since 05.11.10
*/
public interface ServerDetector {
/**
* Detect the server. A {@link ServerHandle} descriptor is returned
* in case of a successful detection, <code>null</code> otherwise.
*
* @param pMBeanServerExecutor a set of MBeanServers which can be used for detecting server informations
* @return the server descriptor or <code>null</code> it this implementation cant detect 'its' server.
*/
ServerHandle detect(MBeanServerExecutor pMBeanServerExecutor);
/**
* Add server specific MBeanServers
*
* @param pMBeanServers set to add detected MBeanServers to
*/
void addMBeanServers(Set<MBeanServerConnection> pMBeanServers);
/**
* Notify detector that the JVM is about to start. A detector can, if needed, block and wait for some condition but
* should ultimatevely return at some point or throw an exception. This notification is executed
* in a very early stage (premain of the Jolokia JVM agent) before the main class of the Server is executed.
* @param instrumentation the Instrumentation implementation
*/
void jvmAgentStartup(Instrumentation instrumentation);
}