| /** |
| * 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.lib.io; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.sun.jersey.api.client.Client; |
| |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.common.util.BaseOperator; |
| |
| /** |
| * This is the base implementation for HTTP operators. |
| * This operator handles the creation and destruction of client connections. |
| * Subclasses must implement the method which processes incoming tuples. |
| * <p></p> |
| * @displayName Abstract HTTP |
| * @category Input |
| * @tags http, input operator |
| * |
| * @param <T> |
| * @since 1.0.2 |
| */ |
| @org.apache.hadoop.classification.InterfaceStability.Evolving |
| public abstract class AbstractHttpOperator<T> extends BaseOperator |
| { |
| @NotNull |
| protected String url; |
| protected transient Client wsClient; |
| |
| /** |
| * The input port which receives tuples for processing. |
| */ |
| public final transient DefaultInputPort<T> input = new DefaultInputPort<T>() |
| { |
| @Override |
| public void process(T t) |
| { |
| processTuple(t); |
| } |
| |
| }; |
| |
| protected abstract void processTuple(T t); |
| |
| @Override |
| public void setup(OperatorContext context) |
| { |
| wsClient = Client.create(); |
| wsClient.setFollowRedirects(true); |
| logger.debug("URL: {}", url); |
| } |
| |
| @Override |
| public void teardown() |
| { |
| if (wsClient != null) { |
| wsClient.destroy(); |
| } |
| super.teardown(); |
| } |
| |
| public String getUrl() |
| { |
| return url; |
| } |
| |
| public void setUrl(String url) |
| { |
| this.url = url; |
| } |
| |
| private static final Logger logger = LoggerFactory.getLogger(AbstractHttpOperator.class); |
| } |