defaultconnectfuture.java

mina是以Java实现的一个开源的网络程序框架

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 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.
 *
 */
package org.apache.mina.core.future;

import org.apache.mina.core.RuntimeIoException;
import org.apache.mina.core.session.IoSession;


/**
 * A default implementation of {@link ConnectFuture}.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev: 671827 $, $Date: 2008-06-26 10:49:48 +0200 (Thu, 26 Jun 2008) $
 */
public class DefaultConnectFuture extends DefaultIoFuture implements
        ConnectFuture {

    private static final Object CANCELED = new Object();

    /**
     * Returns a new {@link ConnectFuture} which is already marked as 'failed to connect'.
     */
    public static ConnectFuture newFailedFuture(Throwable exception) {
        DefaultConnectFuture failedFuture = new DefaultConnectFuture();
        failedFuture.setException(exception);
        return failedFuture;
    }

    /**
     * Creates a new instance.
     */
    public DefaultConnectFuture() {
        super(null);
    }

    @Override
    public IoSession getSession() {
        Object v = getValue();
        if (v instanceof RuntimeException) {
            throw (RuntimeException) v;
        } else if (v instanceof Error) {
            throw (Error) v;
        } else if (v instanceof Throwable) {
            throw (RuntimeIoException) new RuntimeIoException(
                    "Failed to get the session.").initCause((Throwable) v);
        } else if (v instanceof IoSession) {
            return (IoSession) v;
        } else {
            return null;
        }
    }

    public Throwable getException() {
        Object v = getValue();
        if (v instanceof Throwable) {
            return (Throwable) v;
        } else {
            return null;
        }
    }

    public boolean isConnected() {
        return getValue() instanceof IoSession;
    }

    public boolean isCanceled() {
        return getValue() == CANCELED;
    }

    public void setSession(IoSession session) {
        if (session == null) {
            throw new NullPointerException("session");
        }
        setValue(session);
    }

    public void setException(Throwable exception) {
        if (exception == null) {
            throw new NullPointerException("exception");
        }
        setValue(exception);
    }

    public void cancel() {
        setValue(CANCELED);
    }

    @Override
    public ConnectFuture await() throws InterruptedException {
        return (ConnectFuture) super.await();
    }

    @Override
    public ConnectFuture awaitUninterruptibly() {
        return (ConnectFuture) super.awaitUninterruptibly();
    }

    @Override
    public ConnectFuture addListener(IoFutureListener<?> listener) {
        return (ConnectFuture) super.addListener(listener);
    }

    @Override
    public ConnectFuture removeListener(IoFutureListener<?> listener) {
        return (ConnectFuture) super.removeListener(listener);
    }
}