modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/ClientListenerRequestHandler.java

/*
 * 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.
 */

package org.apache.ignite.internal.processors.odbc;

import org.apache.ignite.internal.binary.BinaryWriterExImpl;

/**
 * Client listener request handler.
 */
public interface ClientListenerRequestHandler {
    /**
     * Handle request.
     *
     * @param req Request.
     * @return Response.
     */
    ClientListenerResponse handle(ClientListenerRequest req);

    /**
     * Handle exception.
     *
     * @param e Exception.
     * @param req Request.
     * @return Error response.
     */
    ClientListenerResponse handleException(Throwable e, ClientListenerRequest req);

    /**
     * Write successful handshake response.
     *
     * @param writer Binary writer.
     */
    void writeHandshake(BinaryWriterExImpl writer);


    /**
     * Checks whether query cancellation is supported within given version of protocol.
     *
     * @return {@code true} if supported, {@code false} otherwise.
     */
    boolean isCancellationSupported();

    /**
     * Detect whether given command is a cancellation command.
     *
     * @param cmdId Command Id
     * @return true if given command is cancellation one, false otherwise;
     */
    boolean isCancellationCommand(int cmdId);

    /**
     * Registers request for futher cancellation if any.
     * @param reqId Request Id.
     * @param cmdType Command Type.
     */
    void registerRequest(long reqId, int cmdType);

    /**
     * Try to unregister request.
     * @param reqId Request Id.
     */
    void unregisterRequest(long reqId);

    /** @return Protocol version. */
    ClientListenerProtocolVersion protocolVersion();
}