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 * 
 * 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.
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package com.sun.star.lib.uno.environments.remote;

import com.sun.star.lib.uno.typedesc.TypeDescription;
import java.io.IOException;

/**
 * An abstraction of remote bridge protocols.
 *
 * A class implementing a given protocol prot must be named
 * com.sun.star.lib.uno.protocols.prot.prot
 * and must have a public constructor that takes four arguments:  The first
 * argument of type com.sun.star.uno.IBridge must not be null.  The
 * second argument of type String represents any attributes; it may
 * be null if there are no attributes.  The third argument of type
 * java.io.InputStream must not be null.  The fourth argument of
 * type java.io.OutputStream must not be null.
 */
public interface IProtocol {
    /**
     * Initializes the connection.
     *
     * This method must be called exactly once, after the
     * readMessage loop has already been established.
     */
    void init() throws IOException;

    void terminate();

    /**
     * Reads a request or reply message.
     *
     * Access to this method from multiple threads must be properly
     * synchronized.
     *
     * @return a non-null message; if the input stream is exhausted, a
     *     java.io.IOException is thrown instead
     */
    Message readMessage() throws IOException;

    /**
     * Writes a request message.
     *
     * @param oid a non-null OID
     * @param type a non-null UNO type
     * @param function a non-null function (the name of a UNO interface method
     *     or attribute compatible with the given type, or either
     *     "queryInterface" or "release")
     * @param threadId a non-null TID
     * @param arguments a list of UNO arguments compatible with the given
     *     type and function; may be null to represent
     *     an empty list
     * @return true if the request message is sent as a synchronous
     *     request
     */
    boolean writeRequest(
        String oid, TypeDescription type, String function, ThreadId tid,
        Object[] arguments)
        throws IOException;

    /**
     * Writes a reply message.
     *
     * @param exception true if the reply corresponds to a raised
     *     exception
     * @param tid a non-null TID
     * @param result if exception is true, a non-null
     *     UNO exception; otherwise, a UNO return value, which may be null to
     *     represent a VOID return value
     */
    void writeReply(boolean exception, ThreadId tid, Object result)
        throws IOException;
}