예제 #1
0
  /** Used by child copy constructors. */
  protected synchronized void copy(Writable other) {
    if (other != null) {
      try {
        DataOutputBuffer out = new DataOutputBuffer();
        other.write(out);
        DataInputBuffer in = new DataInputBuffer();
        in.reset(out.getData(), out.getLength());
        readFields(in);

      } catch (IOException e) {
        throw new IllegalArgumentException("map cannot be copied: " + e.getMessage());
      }

    } else {
      throw new IllegalArgumentException("source map cannot be null");
    }
  }
예제 #2
0
파일: RPC.java 프로젝트: baeeq/hadoop-20
  /**
   * Construct a client-side proxy that implements the named protocol, talking to a server at the
   * named address.
   *
   * @param protocol protocol
   * @param clientVersion client's version
   * @param addr server address
   * @param ticket security ticket
   * @param conf configuration
   * @param factory socket factory
   * @param rpcTimeout max time for each rpc; 0 means no timeout
   * @return the proxy
   * @throws IOException if any error occurs
   */
  @SuppressWarnings("unchecked")
  public static <T extends VersionedProtocol> ProtocolProxy<T> getProtocolProxy(
      Class<T> protocol,
      long clientVersion,
      InetSocketAddress addr,
      UserGroupInformation ticket,
      Configuration conf,
      SocketFactory factory,
      int rpcTimeout)
      throws IOException {
    T proxy =
        (T)
            Proxy.newProxyInstance(
                protocol.getClassLoader(),
                new Class[] {protocol},
                new Invoker(addr, ticket, conf, factory, rpcTimeout, protocol));
    String protocolName = protocol.getName();

    try {
      ProtocolSignature serverInfo =
          proxy.getProtocolSignature(
              protocolName, clientVersion, ProtocolSignature.getFingerprint(protocol.getMethods()));
      return new ProtocolProxy<T>(protocol, proxy, serverInfo.getMethods());
    } catch (RemoteException re) {
      IOException ioe = re.unwrapRemoteException(IOException.class);
      if (ioe.getMessage()
          .startsWith(IOException.class.getName() + ": " + NoSuchMethodException.class.getName())) {
        // Method getProtocolSignature not supported
        long serverVersion = proxy.getProtocolVersion(protocol.getName(), clientVersion);
        if (serverVersion == clientVersion) {
          return new ProtocolProxy<T>(protocol, proxy, null);
        }
        throw new VersionMismatch(protocolName, clientVersion, serverVersion, proxy);
      }
      throw re;
    }
  }