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package org.glassfish.osgi.cli.remote;

import java.io.InputStream;
import java.io.PrintStream;
import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.UUID;
import org.apache.felix.service.command.CommandSession;

/**
 * This delegating class is used to overcome some limitations of the
 * {@link CommandSession} interface when it comes to session management.
 * 
 * 

* Once implementations are mature enough to not assume environmental behavior * this class will become obsolete. *

* * @author ancoron */ public class RemoteCommandSession { private final CommandSession delegate; private final String id; public RemoteCommandSession(CommandSession delegate) { this.delegate = delegate; this.id = UUID.randomUUID().toString(); } /** * Get the identifier for this session, which is a UUID of type 4. * * @return */ public String getId() { return id; } /** * Attached the specified streams to the delegate of this instance and * returns the modified delegate. * * @param in The "stdin" stream for the session * @param out The "stdout" stream for the session * @param err The "stderr" stream for the session * * @return The modified {@link CommandSession} delegate * * @see #detach() */ public CommandSession attach(InputStream in, PrintStream out, PrintStream err) { set(this.delegate, "in", in); set(this.delegate, "out", out); set(this.delegate, "err", err); return this.delegate; } /** * Detaches all previously attached streams and hence, ensures that there * are no stale references left. * * @see #attach(java.io.InputStream, java.io.PrintStream, java.io.PrintStream) */ public void detach() { set(this.delegate, "in", null); set(this.delegate, "out", null); set(this.delegate, "err", null); } private void set(final Object obj, final String field, final Object value) { try { final Field f = obj.getClass().getDeclaredField(field); final boolean accessible = f.isAccessible(); if(!accessible) { AccessController.doPrivileged(new PrivilegedAction() { @Override public Void run() { f.setAccessible(true); try { f.set(obj, value); } catch(Exception x) { throw new RuntimeException(x); } // reset to previous state... f.setAccessible(accessible); return null; } }); } else { f.set(obj, value); } } catch(Exception x) { throw new RuntimeException(x); } } }




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