Examples of org.apache.hadoop.io.ObjectWritable$NullInstance

org.apache.hadoop.io.ObjectWritable
A polymorphic Writable that writes an instance with it's class name. Handles arrays, strings and primitive types without a Writable wrapper.

    return new SerDeStats();
  }


  @Override
  public Object deserialize(Writable writable) throws SerDeException {
    ObjectWritable objectWritable = (ObjectWritable) writable;
    return objectWritable.get();
  }

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        return null;
      }


      @Override
      public ObjectWritable createValue() {
        return new ObjectWritable();
      }


      @Override
      public long getPos() throws IOException {
        // Not required.

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  @Override
  public final void add(M item) {
    size++;
    try {
      new ObjectWritable(item).write(writer);
    } catch (IOException e) {
      LOG.error(e);
    }
  }

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    public void readFields(DataInput in) throws IOException {
      methodName = Text.readString(in);
      parameters = new Object[in.readInt()];
      parameterClasses = new Class[parameters.length];
      ObjectWritable objectWritable = new ObjectWritable();
      for (int i = 0; i < parameters.length; i++) {
        parameters[i] = ObjectWritable.readObject(in, objectWritable, this.conf);
        parameterClasses[i] = objectWritable.getDeclaredClass();
      }
    }

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    public Object invoke(@SuppressWarnings("unused") Object proxy,
        Method method, Object[] args)
      throws Throwable {
      long startTime = System.currentTimeMillis();
      ObjectWritable value = (ObjectWritable)
        client.call(new Invocation(method, args), address, ticket);
      long callTime = System.currentTimeMillis() - startTime;
      LOG.debug("Call: " + method.getName() + " " + callTime);
      return value.get();
    }

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    m.inc(processingTime);
  }


        if (verbose) log("Return: "+value);


        return new ObjectWritable(method.getReturnType(), value);


      } catch (InvocationTargetException e) {
        Throwable target = e.getTargetException();
        if (target instanceof IOException) {
          throw (IOException)target;

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    public void readFields(DataInput in) throws IOException {
      methodName = UTF8.readString(in);
      parameters = new Object[in.readInt()];
      parameterClasses = new Class[parameters.length];
      ObjectWritable objectWritable = new ObjectWritable();
      for (int i = 0; i < parameters.length; i++) {
        parameters[i] = ObjectWritable.readObject(in, objectWritable, this.conf);
        parameterClasses[i] = objectWritable.getDeclaredClass();
      }
    }

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      long startTime = 0;
      if (logDebug) {
        startTime = System.currentTimeMillis();
      }


      ObjectWritable value = (ObjectWritable)
        client.call(new Invocation(method, args), remoteId);
      if (logDebug) {
        long callTime = System.currentTimeMillis() - startTime;
        LOG.debug("Call: " + method.getName() + " " + callTime);
      }
      return value.get();
    }

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        rpcMetrics.addRpcQueueTime(qTime);
        rpcMetrics.addRpcProcessingTime(processingTime);
        rpcMetrics.addRpcProcessingTime(call.getMethodName(), processingTime);
        if (verbose) log("Return: "+value);


        return new ObjectWritable(method.getReturnType(), value);


      } catch (InvocationTargetException e) {
        Throwable target = e.getTargetException();
        if (target instanceof IOException) {
          throw (IOException)target;

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      LOG.error("Error initializing spilled data stream.", e);
      throw new RuntimeException(e);
    }
    spillOutputBuffer = new SpillingDataOutputBuffer(bufferCount, bufferSize,
        threshold, direct, processor);
    objectWritable = new ObjectWritable();
    objectWritable.setConf(conf);
    this.conf = conf;
  }

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