/*
 * 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.thrift;

import org.apache.thrift.async.AsyncMethodCallback;
import org.apache.thrift.protocol.TMessage;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.server.AbstractNonblockingServer;

public abstract class AsyncProcessFunction<I, T extends TBase, R> {
    final String methodName;

    public AsyncProcessFunction(String methodName) {
        this.methodName = methodName;
    }

    protected abstract boolean isOneway();

    public abstract void start(I iface, T args, AsyncMethodCallback<R> resultHandler) throws TException;

    public abstract T getEmptyArgsInstance();

    public abstract AsyncMethodCallback<R> getResultHandler(final AbstractNonblockingServer.AsyncFrameBuffer fb, int seqid);

    public String getMethodName() {
        return methodName;
    }

    public void sendResponse(final AbstractNonblockingServer.AsyncFrameBuffer fb, final TSerializable result, final byte type, final int seqid) throws TException {
        TProtocol oprot = fb.getOutputProtocol();

        oprot.writeMessageBegin(new TMessage(getMethodName(), type, seqid));
        result.write(oprot);
        oprot.writeMessageEnd();
        oprot.getTransport().flush();

        fb.responseReady();
    }
}
