org.apache.mina.core.future.ReadFuture Maven / Gradle / Ivy
/*
* 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.session.IoSession;
/**
* An {@link IoFuture} for {@link IoSession#read() asynchronous read requests}.
*
* Example
*
* IoSession session = ...;
*
* // useReadOperation must be enabled to use read operation.
* session.getConfig().setUseReadOperation(true);
*
* ReadFuture future = session.read();
*
* // Wait until a message is received.
* future.awaitUninterruptibly();
*
* try {
* Object message = future.getMessage();
* } catch (Exception e) {
* ...
* }
*
*
* @author Apache MINA Project
*/
public interface ReadFuture extends IoFuture {
/**
* Get the read message.
*
* @return the received message. It returns null if this
* future is not ready or the associated {@link IoSession} has been closed.
*/
Object getMessage();
/**
* @return true if a message was received successfully.
*/
boolean isRead();
/**
* @return true if the {@link IoSession} associated with this
* future has been closed.
*/
boolean isClosed();
/**
* @return the cause of the read failure if and only if the read
* operation has failed due to an {@link Exception}. Otherwise,
* null is returned.
*/
Throwable getException();
/**
* Sets the message is written, and notifies all threads waiting for
* this future. This method is invoked by MINA internally. Please do
* not call this method directly.
*
* @param message The received message to store in this future
*/
void setRead(Object message);
/**
* Sets the associated {@link IoSession} is closed. This method is invoked
* by MINA internally. Please do not call this method directly.
*/
void setClosed();
/**
* Sets the cause of the read failure, and notifies all threads waiting
* for this future. This method is invoked by MINA internally. Please
* do not call this method directly.
*
* @param cause The exception to store in the Future instance
*/
void setException(Throwable cause);
/**
* {@inheritDoc}
*/
@Override
ReadFuture await() throws InterruptedException;
/**
* {@inheritDoc}
*/
@Override
ReadFuture awaitUninterruptibly();
/**
* {@inheritDoc}
*/
@Override
ReadFuture addListener(IoFutureListener listener);
/**
* {@inheritDoc}
*/
@Override
ReadFuture removeListener(IoFutureListener listener);
}