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Channel.java
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/*
* Copyright 2014, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package io.grpc;
import javax.annotation.concurrent.ThreadSafe;
/**
* A Channel provides an abstraction over the transport layer that is designed to be consumed
* by stub implementations. Channel and its associated types {@link Call} and
* {@link Call.Listener} exchange parsed request and response objects whereas the
* transport layer only works with serialized data.
*
* <p>Applications can add common cross-cutting behaviors to stubs by decorating Channel
* implementations using {@link ClientInterceptor}. It is expected that most application
* code will not use this interface directly but rather work with stubs that have been bound to a
* Channel that was decorated during application initialization,
*/
@ThreadSafe
public interface Channel {
/**
* Create a {@link Call} to the remote operation specified by the given
* {@link MethodDescriptor}. The returned {@link Call} does not trigger any remote
* behavior until {@link Call#start(Call.Listener, Metadata.Headers)} is
* invoked.
*
* @param methodDescriptor describes the name and parameter types of the operation to call.
* @return a {@link Call} bound to the specified method.
*
*/
public <RequestT, ResponseT> Call<RequestT, ResponseT> newCall(
MethodDescriptor<RequestT, ResponseT> methodDescriptor);
}