/*
 * 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.blur.thirdparty.thrift_0_9_0;

import org.apache.blur.thirdparty.thrift_0_9_0.protocol.TMessage;
import org.apache.blur.thirdparty.thrift_0_9_0.protocol.TMessageType;
import org.apache.blur.thirdparty.thrift_0_9_0.protocol.TProtocol;
import org.apache.blur.thirdparty.thrift_0_9_0.protocol.TProtocolException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class ProcessFunction<I, T extends TBase> {
  private final String methodName;

  private static final Logger LOGGER = LoggerFactory.getLogger(ProcessFunction.class.getName());

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

  public final void process(int seqid, TProtocol iprot, TProtocol oprot, I iface) throws TException {
    T args = getEmptyArgsInstance();
    try {
      args.read(iprot);
    } catch (TProtocolException e) {
      iprot.readMessageEnd();
      TApplicationException x = new TApplicationException(TApplicationException.PROTOCOL_ERROR, e.getMessage());
      oprot.writeMessageBegin(new TMessage(getMethodName(), TMessageType.EXCEPTION, seqid));
      x.write(oprot);
      oprot.writeMessageEnd();
      oprot.getTransport().flush();
      return;
    }
    iprot.readMessageEnd();
    TBase result = null;

    try {
      result = getResult(iface, args);
    } catch(Throwable th) {
      LOGGER.error("Internal error processing " + getMethodName(), th);
      TApplicationException x = new TApplicationException(TApplicationException.INTERNAL_ERROR, 
        "Internal error processing " + getMethodName());
      oprot.writeMessageBegin(new TMessage(getMethodName(), TMessageType.EXCEPTION, seqid));
      x.write(oprot);
      oprot.writeMessageEnd();
      oprot.getTransport().flush();
      return;
    }

    if(!isOneway()) {
      oprot.writeMessageBegin(new TMessage(getMethodName(), TMessageType.REPLY, seqid));
      result.write(oprot);
      oprot.writeMessageEnd();
      oprot.getTransport().flush();
    }
  }

  protected abstract boolean isOneway();

  public abstract TBase getResult(I iface, T args) throws TException;

  public abstract T getEmptyArgsInstance();

  public String getMethodName() {
    return methodName;
  }
}