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• RemoteServer.java

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org.refcodes.remoting.RemoteServer Maven / Gradle / Ivy

// /////////////////////////////////////////////////////////////////////////////
// REFCODES.ORG
// =============================================================================
// This code is copyright (c) by Siegfried Steiner, Munich, Germany, distributed
// on an "AS IS" BASIS WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, and licen-
// sed under the following (see "http://en.wikipedia.org/wiki/Multi-licensing")
// licenses:
// =============================================================================
// GNU General Public License, v3.0 ("http://www.gnu.org/licenses/gpl-3.0.html")
// together with the GPL linking exception applied; as being applied by the GNU
// Classpath ("http://www.gnu.org/software/classpath/license.html")
// =============================================================================
// Apache License, v2.0 ("http://www.apache.org/licenses/TEXT-2.0")
// =============================================================================
// Please contact the copyright holding author(s) of the software artifacts in
// question for licensing issues not being covered by the above listed licenses,
// also regarding commercial licensing models or regarding the compatibility
// with other open source licenses.
// /////////////////////////////////////////////////////////////////////////////

package org.refcodes.remoting;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.refcodes.component.DigestException;
import org.refcodes.controlflow.ControlFlowUtility;
import org.refcodes.controlflow.RetryTimeout;
import org.refcodes.data.IoTimeout;
import org.refcodes.data.RetryLoopCount;
import org.refcodes.data.SleepLoopTime;
import org.refcodes.exception.ExceptionAccessor;
import org.refcodes.exception.Trap;
import org.refcodes.exception.VetoException;
import org.refcodes.exception.VetoException.VetoRuntimeException;
import org.refcodes.generator.Generator;
import org.refcodes.generator.UniqueIdGenerator;
import org.refcodes.mixin.BusyAccessor;

/**
 * A {@link RemoteServer} promotes subjects to be operated on by
 * {@link RemoteClient} instances.
 */
public class RemoteServer extends AbstractRemote {

	// /////////////////////////////////////////////////////////////////////////
	// STATICS:
	// /////////////////////////////////////////////////////////////////////////

	private static final Logger LOGGER = Logger.getLogger( RemoteServer.class.getName() );

	// /////////////////////////////////////////////////////////////////////////
	// VARIABLES:
	// /////////////////////////////////////////////////////////////////////////

	private InstanceHandler _instanceHandler = new InstanceHandler();
	private Generator _instanceIdGenerator = new UniqueIdGenerator( INSTANCE_ID_LENGTH );

	// /////////////////////////////////////////////////////////////////////////
	// CONSTRUCTORS:
	// /////////////////////////////////////////////////////////////////////////

	/**
	 * Default constructor of the {@link RemoteServer} will use a default
	 * {@link ExecutorService}.
	 */
	public RemoteServer() {
		super( null );
	}

	/**
	 * Instantiates a new {@link RemoteServer} instance with the given
	 * {@link ExecutorService} to be used.
	 *
	 * @param aExecutorService The {@link ExecutorService} to be used.
	 */
	public RemoteServer( ExecutorService aExecutorService ) {
		super( aExecutorService );
	}

	// /////////////////////////////////////////////////////////////////////////
	// METHODS:
	// /////////////////////////////////////////////////////////////////////////

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void clear() {
		ControlFlowUtility.throwIllegalStateException( isDestroyed() );
		signOffAllSubjects();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public synchronized void close() throws IOException {
		if ( IS_LOG_DEBUG_ENABLED ) {
			LOGGER.info( "CLOSE called on <" + getClass().getName() + ">." );
		}
		close( null );
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean isBusy() {
		ControlFlowUtility.throwIllegalStateException( isDestroyed() );
		return _instanceHandler.isBusy();
	}

	/**
	 * Returns true if the provided subject is contained inside this
	 * {@link RemoteServer}.
	 * 
	 * @param aSubject The subject to be tested if it is contained inside the
	 *        {@link RemoteServer}.
	 * 
	 * @return True if the given subject is contained inside the
	 *         {@link RemoteServer}.
	 */
	public boolean hasSubject( Object aSubject ) {
		ControlFlowUtility.throwIllegalStateException( isDestroyed() );
		return _instanceHandler.hasSubject( aSubject );
	}

	/**
	 * Returns an (immutable) iterator containing all the proxy objects
	 * previously being published. Use the {@link #signOffSubject(Object)}
	 * method in order to remove a published subject.
	 * 
	 * @return An iterator containing the published proxy objects.
	 */
	public Iterator