Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/484#discussion_r26483463
--- Diff:
flink-staging/flink-streaming/flink-streaming-connectors/src/main/java/org/apache/flink/streaming/connectors/socket/SocketClientSink.java
---
@@ -0,0 +1,107 @@
+/*
+ * 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 org.apache.flink.streaming.connectors.socket;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.Socket;
+
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.function.sink.RichSinkFunction;
+import org.apache.flink.streaming.connectors.util.SerializationSchema;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class SocketClientSink<IN> extends RichSinkFunction<IN> {
+ private static final long serialVersionUID = 1L;
+
+ private static final Logger LOG =
LoggerFactory.getLogger(SocketClientSink.class);
+
+ private final String hostName;
+ private final int port;
+ private final SerializationSchema<IN, byte[]> scheme;
+ private transient Socket client;
+ private transient DataOutputStream dataOutputStream;
+
+ public SocketClientSink(String hostName, int port,
SerializationSchema<IN, byte[]> schema) {
+ this.hostName = hostName;
+ this.port = port;
+ this.scheme = schema;
+ }
+
+ /**
+ * Initializes the connection to Socket.
+ */
+ public void initialize() {
+ OutputStream outputStream;
+ try {
+ client = new Socket(hostName, port);
+ outputStream = client.getOutputStream();
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ dataOutputStream = new DataOutputStream(outputStream);
+ }
+
+ /**
+ * Called when new data arrives to the sink, and forwards it to Socket.
+ *
+ * @param value
+ * The incoming data
+ */
+ @Override
+ public void invoke(IN value) {
+ byte[] msg = scheme.serialize(value);
+ try {
+ dataOutputStream.write(msg);
+ } catch (IOException e) {
+ if(LOG.isErrorEnabled()){
+ LOG.error("Cannot send message to socket server
at {}:{}", hostName, port);
+ }
+ }
+ }
+
+ /**
+ * Closes the connection.
+ */
+ private void closeConnection(){
--- End diff --
really? :)
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