| /** |
| * 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 com.datatorrent.api; |
| |
| import com.datatorrent.api.Context.PortContext; |
| import com.datatorrent.api.Operator.InputPort; |
| |
| /** |
| * Default abstract implementation for input ports. |
| * An operator would typically define a derived inner class with the process method. |
| * This class is designed for use with a transient field, i.e. not to be serialized with the operator state. |
| * |
| * @param <T> |
| * @since 0.3.2 |
| */ |
| public abstract class DefaultInputPort<T> implements InputPort<T>, Sink<T> |
| { |
| protected int count; |
| protected boolean connected = false; |
| |
| /** |
| * <p>Constructor for DefaultInputPort.</p> |
| */ |
| public DefaultInputPort() |
| { |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Sink<T> getSink() |
| { |
| return this; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void setConnected(boolean connected) |
| { |
| this.connected = connected; |
| } |
| |
| /** |
| * Returns true if this port is connected and false otherwise. |
| * @return true if this port is connected and false otherwise. |
| */ |
| public boolean isConnected() |
| { |
| return connected; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public StreamCodec<T> getStreamCodec() |
| { |
| return null; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void put(T tuple) |
| { |
| count++; |
| process(tuple); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int getCount(boolean reset) |
| { |
| try { |
| return count; |
| } finally { |
| if (reset) { |
| count = 0; |
| } |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void setup(PortContext context) |
| { |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void teardown() |
| { |
| } |
| |
| /** |
| * <p>process.</p> |
| */ |
| public abstract void process(T tuple); |
| |
| } |