/
ImportedClassLoaderTable.java
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/
ImportedClassLoaderTable.java
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/*
* The MIT License
*
* Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package hudson.remoting;
import edu.umd.cs.findbugs.annotations.NonNull;
import hudson.remoting.RemoteClassLoader.IClassLoader;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Imported {@link ClassLoader} table.
* Stores references to {@link ClassLoader} instances, which have been exported to the instance by the remote side.
* @author Kohsuke Kawaguchi
* @since 2.0
*/
final class ImportedClassLoaderTable {
final Channel channel;
final Map<IClassLoader,ClassLoader> classLoaders = new ConcurrentHashMap<>();
ImportedClassLoaderTable(Channel channel) {
this.channel = channel;
}
/**
* Maps the exported object ID to the classloader.
*
* <p>
* This method "consumes" the given oid for the purpose of reference counting.
*/
@NonNull
public ClassLoader get(int oid) {
return get(RemoteInvocationHandler.wrap(channel, oid, IClassLoader.class, false, false, false, false));
}
/**
* Retrieves classloader for the specified proxy class.
* If the classloader instance is missing in the cache, it will be created during the call.
* @param classLoaderProxy Proxy instance
* @return Classloader instance
*/
@NonNull
public ClassLoader get(@NonNull IClassLoader classLoaderProxy) {
// we need to be able to use the same hudson.remoting classes, hence delegate to this class loader.
return classLoaders.computeIfAbsent(classLoaderProxy, proxy -> RemoteClassLoader.create(channel.baseClassLoader, proxy));
}
}