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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.
 */

package org.apache.thrift.transport;

/**
 * Server transport. Object which provides client transports.
 *
 */
public abstract class TServerTransport {

  public abstract void listen() throws TTransportException;

  public final TTransport accept() throws TTransportException {
    TTransport transport = acceptImpl();
    if (transport == null) {
      throw new TTransportException("accept() may not return NULL");
    }
    return transport;
  }

  public abstract void close();

  protected abstract TTransport acceptImpl() throws TTransportException;

  /**
   * Optional method implementation. This signals to the server transport
   * that it should break out of any accept() or listen() that it is currently
   * blocked on. This method, if implemented, MUST be thread safe, as it may
   * be called from a different thread context than the other TServerTransport
   * methods.
   */
  public void interrupt() {}

}