lib/java/src/transport/THttpClient.java

// Copyright (c) 2006- Facebook
// Distributed under the Thrift Software License
//
// See accompanying file LICENSE or visit the Thrift site at:
// http://developers.facebook.com/thrift/

package com.facebook.thrift.transport;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.IOException;

import java.net.URL;
import java.net.HttpURLConnection;

/**
 * HTTP implementation of the TTransport interface. Used for working with a
 * Thrift web services implementation.
 *
 * @author Mark Slee <mcslee@facebook.com>
 */
public class THttpClient extends TTransport {

  private URL url_ = null;

  private final ByteArrayOutputStream requestBuffer_ =
    new ByteArrayOutputStream();

  private InputStream inputStream_ = null;

  private int connectTimeout_ = 0;

  private int readTimeout_ = 0;

  public THttpClient(String url) throws TTransportException {
    try {
      url_ = new URL(url);
    } catch (IOException iox) {
      throw new TTransportException(iox);
    }
  }

  public void setConnectTimeout(int timeout) {
    connectTimeout_ = timeout;
  }

  public void setReadTimeout(int timeout) {
    readTimeout_ = timeout;
  }

  public void open() {}

  public void close() {}

  public boolean isOpen() {
    return true;
  }

  public int read(byte[] buf, int off, int len) throws TTransportException {
    if (inputStream_ == null) {
      throw new TTransportException("Response buffer is empty, no request.");
    }
    try {
      int ret = inputStream_.read(buf, off, len);
      if (ret == -1) {
        throw new TTransportException("No more data available.");
      }
      return ret;
    } catch (IOException iox) {
      throw new TTransportException(iox);
    }
  }

  public void write(byte[] buf, int off, int len) {
    requestBuffer_.write(buf, off, len);
  }

  public void flush() throws TTransportException {
    // Extract request and reset buffer
    byte[] data = requestBuffer_.toByteArray(); 
    requestBuffer_.reset();

    try {
      // Create connection object
      HttpURLConnection connection = (HttpURLConnection)url_.openConnection();

      // Timeouts, only if explicitly set
      if (connectTimeout_ > 0) {
        connection.setConnectTimeout(connectTimeout_);
      }
      if (readTimeout_ > 0) {
        connection.setReadTimeout(readTimeout_);
      }

      // Make the request
      connection.setRequestMethod("POST");
      connection.setRequestProperty("Content-Type", "application/x-thrift");
      connection.setRequestProperty("Accept", "application/x-thrift");
      connection.setRequestProperty("User-Agent", "Java/THttpClient");
      connection.setDoOutput(true);
      connection.connect();
      connection.getOutputStream().write(data);

      int responseCode = connection.getResponseCode();
      if (responseCode != HttpURLConnection.HTTP_OK) {
        throw new TTransportException("HTTP Response code: " + responseCode);
      }

      // Read the responses
      inputStream_ = connection.getInputStream();

    } catch (IOException iox) {
      throw new TTransportException(iox);
    } 
  }
}