| /* |
| * 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. |
| */ |
| module thrift.server.transport.base; |
| |
| import thrift.base; |
| import thrift.transport.base; |
| import thrift.util.cancellation; |
| |
| /** |
| * Some kind of I/O device enabling servers to listen for incoming client |
| * connections and communicate with them via a TTransport interface. |
| */ |
| interface TServerTransport { |
| /** |
| * Starts listening for server connections. |
| * |
| * Just as simliar functions commonly found in socket libraries, this |
| * function does not block. |
| * |
| * If the socket is already listening, nothing happens. |
| * |
| * Throws: TServerTransportException if listening failed or the transport |
| * was already listening. |
| */ |
| void listen(); |
| |
| /** |
| * Closes the server transport, causing it to stop listening. |
| * |
| * Throws: TServerTransportException if the transport was not listening. |
| */ |
| void close(); |
| |
| /** |
| * Returns whether the server transport is currently listening. |
| */ |
| bool isListening() @property; |
| |
| /** |
| * Accepts a client connection and returns an opened TTransport for it, |
| * never returning null. |
| * |
| * Blocks until a client connection is available. |
| * |
| * Params: |
| * cancellation = If triggered, requests the call to stop blocking and |
| * return with a TCancelledException. Implementations are free to |
| * ignore this if they cannot provide a reasonable. |
| * |
| * Throws: TServerTransportException if accepting failed, |
| * TCancelledException if it was cancelled. |
| */ |
| TTransport accept(TCancellation cancellation = null) out (result) { |
| assert(result !is null); |
| } |
| } |
| |
| /** |
| * Server transport exception. |
| */ |
| class TServerTransportException : TException { |
| /** |
| * Error codes for the various types of exceptions. |
| */ |
| enum Type { |
| /// |
| UNKNOWN, |
| |
| /// The server socket is not listening, but excepted to be. |
| NOT_LISTENING, |
| |
| /// The server socket is already listening, but expected not to be. |
| ALREADY_LISTENING, |
| |
| /// An operation on the primary underlying resource, e.g. a socket used |
| /// for accepting connections, failed. |
| RESOURCE_FAILED |
| } |
| |
| /// |
| this(Type type, string file = __FILE__, size_t line = __LINE__, Throwable next = null) { |
| this(errorMsg(type), type, file, line, next); |
| } |
| |
| /// |
| this(string msg, string file = __FILE__, size_t line = __LINE__, |
| Throwable next = null) |
| { |
| this(msg, Type.UNKNOWN, file, line, next); |
| } |
| |
| /// |
| this(string msg, Type type, string file = __FILE__, size_t line = __LINE__, |
| Throwable next = null) |
| { |
| super(msg, file, line, next); |
| type_ = type; |
| } |
| |
| /// |
| Type type() const nothrow @property { |
| return type_; |
| } |
| |
| protected: |
| Type type_; |
| |
| private: |
| string errorMsg(Type type) { |
| string msg = "TTransportException: "; |
| switch (type) { |
| case Type.UNKNOWN: msg ~= "Unknown server transport exception"; break; |
| case Type.NOT_LISTENING: msg ~= "Server transport not listening"; break; |
| case Type.ALREADY_LISTENING: msg ~= "Server transport already listening"; break; |
| case Type.RESOURCE_FAILED: msg ~= "An underlying resource failed"; break; |
| default: msg ~= "(Invalid exception type)"; break; |
| } |
| return msg; |
| } |
| } |
| |