d1f0dd612d
git-svn-id: https://osmand.googlecode.com/svn/trunk@602 e29c36b1-1cfa-d876-8d93-3434fc2bb7b8
118 lines
5.3 KiB
Java
118 lines
5.3 KiB
Java
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package com.google.protobuf;
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/**
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* <p>An {@code RpcController} mediates a single method call. The primary
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* purpose of the controller is to provide a way to manipulate settings
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* specific to the RPC implementation and to find out about RPC-level errors.
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*
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* <p>Starting with version 2.3.0, RPC implementations should not try to build
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* on this, but should instead provide code generator plugins which generate
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* code specific to the particular RPC implementation. This way the generated
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* code can be more appropriate for the implementation in use and can avoid
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* unnecessary layers of indirection.
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*
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* <p>The methods provided by the {@code RpcController} interface are intended
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* to be a "least common denominator" set of features which we expect all
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* implementations to support. Specific implementations may provide more
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* advanced features (e.g. deadline propagation).
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*
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* @author kenton@google.com Kenton Varda
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*/
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public interface RpcController {
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// -----------------------------------------------------------------
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// These calls may be made from the client side only. Their results
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// are undefined on the server side (may throw RuntimeExceptions).
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/**
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* Resets the RpcController to its initial state so that it may be reused in
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* a new call. This can be called from the client side only. It must not
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* be called while an RPC is in progress.
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*/
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void reset();
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/**
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* After a call has finished, returns true if the call failed. The possible
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* reasons for failure depend on the RPC implementation. {@code failed()}
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* most only be called on the client side, and must not be called before a
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* call has finished.
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*/
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boolean failed();
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/**
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* If {@code failed()} is {@code true}, returns a human-readable description
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* of the error.
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*/
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String errorText();
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/**
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* Advises the RPC system that the caller desires that the RPC call be
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* canceled. The RPC system may cancel it immediately, may wait awhile and
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* then cancel it, or may not even cancel the call at all. If the call is
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* canceled, the "done" callback will still be called and the RpcController
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* will indicate that the call failed at that time.
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*/
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void startCancel();
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// -----------------------------------------------------------------
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// These calls may be made from the server side only. Their results
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// are undefined on the client side (may throw RuntimeExceptions).
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/**
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* Causes {@code failed()} to return true on the client side. {@code reason}
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* will be incorporated into the message returned by {@code errorText()}.
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* If you find you need to return machine-readable information about
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* failures, you should incorporate it into your response protocol buffer
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* and should NOT call {@code setFailed()}.
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*/
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void setFailed(String reason);
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/**
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* If {@code true}, indicates that the client canceled the RPC, so the server
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* may as well give up on replying to it. This method must be called on the
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* server side only. The server should still call the final "done" callback.
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*/
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boolean isCanceled();
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/**
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* Asks that the given callback be called when the RPC is canceled. The
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* parameter passed to the callback will always be {@code null}. The
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* callback will always be called exactly once. If the RPC completes without
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* being canceled, the callback will be called after completion. If the RPC
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* has already been canceled when NotifyOnCancel() is called, the callback
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* will be called immediately.
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*
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* <p>{@code notifyOnCancel()} must be called no more than once per request.
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* It must be called on the server side only.
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*/
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void notifyOnCancel(RpcCallback<Object> callback);
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}
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