/*
* Copyright 2016 The Netty Project
*
* The Netty Project 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 io.netty.channel;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.FutureListener;
import java.net.ConnectException;
import java.net.SocketAddress;
public interface ChannelOutboundInvoker {
/**
* Request to bind to the given {@link SocketAddress} and notify the {@link ChannelFuture} once the operation
* completes, either because the operation was successful or because of an error.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)} method
* called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture bind(SocketAddress localAddress);
/**
* Request to connect to the given {@link SocketAddress} and notify the {@link ChannelFuture} once the operation
* completes, either because the operation was successful or because of an error.
* <p>
* If the connection fails because of a connection timeout, the {@link ChannelFuture} will get failed with
* a {@link ConnectTimeoutException}. If it fails because of connection refused a {@link ConnectException}
* will be used.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture connect(SocketAddress remoteAddress);
/**
* Request to connect to the given {@link SocketAddress} while bind to the localAddress and notify the
* {@link ChannelFuture} once the operation completes, either because the operation was successful or because of
* an error.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress);
/**
* Request to disconnect from the remote peer and notify the {@link ChannelFuture} once the operation completes,
* either because the operation was successful or because of an error.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#disconnect(ChannelHandlerContext, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture disconnect();
/**
* Request to close the {@link Channel} and notify the {@link ChannelFuture} once the operation completes,
* either because the operation was successful or because of
* an error.
*
* After it is closed it is not possible to reuse it again.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#close(ChannelHandlerContext, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture close();
/**
* Request to deregister from the previous assigned {@link EventExecutor} and notify the
* {@link ChannelFuture} once the operation completes, either because the operation was successful or because of
* an error.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#deregister(ChannelHandlerContext, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*
*/
ChannelFuture deregister();
/**
* Request to bind to the given {@link SocketAddress} and notify the {@link ChannelFuture} once the operation
* completes, either because the operation was successful or because of an error.
*
* The given {@link ChannelPromise} will be notified.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#bind(ChannelHandlerContext, SocketAddress, ChannelPromise)} method
* called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture bind(SocketAddress localAddress, ChannelPromise promise);
/**
* Request to connect to the given {@link SocketAddress} and notify the {@link ChannelFuture} once the operation
* completes, either because the operation was successful or because of an error.
*
* The given {@link ChannelFuture} will be notified.
*
* <p>
* If the connection fails because of a connection timeout, the {@link ChannelFuture} will get failed with
* a {@link ConnectTimeoutException}. If it fails because of connection refused a {@link ConnectException}
* will be used.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture connect(SocketAddress remoteAddress, ChannelPromise promise);
/**
* Request to connect to the given {@link SocketAddress} while bind to the localAddress and notify the
* {@link ChannelFuture} once the operation completes, either because the operation was successful or because of
* an error.
*
* The given {@link ChannelPromise} will be notified and also returned.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#connect(ChannelHandlerContext, SocketAddress, SocketAddress, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise);
/**
* Request to disconnect from the remote peer and notify the {@link ChannelFuture} once the operation completes,
* either because the operation was successful or because of an error.
*
* The given {@link ChannelPromise} will be notified.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#disconnect(ChannelHandlerContext, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture disconnect(ChannelPromise promise);
/**
* Request to close the {@link Channel} and notify the {@link ChannelFuture} once the operation completes,
* either because the operation was successful or because of
* an error.
*
* After it is closed it is not possible to reuse it again.
* The given {@link ChannelPromise} will be notified.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#close(ChannelHandlerContext, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture close(ChannelPromise promise);
/**
* Request to deregister from the previous assigned {@link EventExecutor} and notify the
* {@link ChannelFuture} once the operation completes, either because the operation was successful or because of
* an error.
*
* The given {@link ChannelPromise} will be notified.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#deregister(ChannelHandlerContext, ChannelPromise)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelFuture deregister(ChannelPromise promise);
/**
* Request to Read data from the {@link Channel} into the first inbound buffer, triggers an
* {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object)} event if data was
* read, and triggers a
* {@link ChannelInboundHandler#channelReadComplete(ChannelHandlerContext) channelReadComplete} event so the
* handler can decide to continue reading. If there's a pending read operation already, this method does nothing.
* <p>
* This will result in having the
* {@link ChannelOutboundHandler#read(ChannelHandlerContext)}
* method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the
* {@link Channel}.
*/
ChannelOutboundInvoker read();
/**
* Request to write a message via this {@link ChannelHandlerContext} through the {@link ChannelPipeline}.
* This method will not request to actual flush, so be sure to call {@link #flush()}
* once you want to request to flush all pending data to the actual transport.
*/
ChannelFuture write(Object msg);
/**
* Request to write a message via this {@link ChannelHandlerContext} through the {@link ChannelPipeline}.
* This method will not request to actual flush, so be sure to call {@link #flush()}
* once you want to request to flush all pending data to the actual transport.
*/
ChannelFuture write(Object msg, ChannelPromise promise);
/**
* Request to flush all pending messages via this ChannelOutboundInvoker.
*/
ChannelOutboundInvoker flush();
/**
* Shortcut for call {@link #write(Object, ChannelPromise)} and {@link #flush()}.
*/
ChannelFuture writeAndFlush(Object msg, ChannelPromise promise);
/**
* Shortcut for call {@link #write(Object)} and {@link #flush()}.
*/
ChannelFuture writeAndFlush(Object msg);
/**
* Return a new {@link ChannelPromise}.
*/
ChannelPromise newPromise();
/**
* Return an new {@link ChannelProgressivePromise}
*/
ChannelProgressivePromise newProgressivePromise();
/**
* Create a new {@link ChannelFuture} which is marked as succeeded already. So {@link ChannelFuture#isSuccess()}
* will return {@code true}. All {@link FutureListener} added to it will be notified directly. Also
* every call of blocking methods will just return without blocking.
*/
ChannelFuture newSucceededFuture();
/**
* Create a new {@link ChannelFuture} which is marked as failed already. So {@link ChannelFuture#isSuccess()}
* will return {@code false}. All {@link FutureListener} added to it will be notified directly. Also
* every call of blocking methods will just return without blocking.
*/
ChannelFuture newFailedFuture(Throwable cause);
/**
* Return a special ChannelPromise which can be reused for different operations.
* <p>
* It's only supported to use
* it for {@link ChannelOutboundInvoker#write(Object, ChannelPromise)}.
* </p>
* <p>
* Be aware that the returned {@link ChannelPromise} will not support most operations and should only be used
* if you want to save an object allocation for every write operation. You will not be able to detect if the
* operation was complete, only if it failed as the implementation will call
* {@link ChannelPipeline#fireExceptionCaught(Throwable)} in this case.
* </p>
* <strong>Be aware this is an expert feature and should be used with care!</strong>
*/
ChannelPromise voidPromise();
}