| /** |
| * Copyright (C) 2015 DataTorrent, Inc. |
| * |
| * Licensed 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> |
| { |
| private 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; |
| } |
| |
| /** {@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); |
| |
| } |