emdn initial

utils/src/main/java/ru/trader/emdn/EMDN.java

@@ -0,0 +1,63 @@
+package ru.trader.emdn;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.zeromq.ZMQ;
+import org.zeromq.ZMQException;
+
+import java.io.UnsupportedEncodingException;
+import java.util.zip.DataFormatException;
+import java.util.zip.Inflater;
+
+public class EMDN {
+    private final static Logger LOG = LoggerFactory.getLogger(EMDN.class);
+
+    private final String subServer;
+
+    public EMDN(String subServer) {
+        this.subServer = subServer;
+    }
+
+
+    public void getData(){
+        ZMQ.Context context = ZMQ.context(1);
+        try (ZMQ.Socket socket = context.socket(ZMQ.SUB)) {
+            socket.setReceiveTimeOut(10000);
+            LOG.debug("Connect to server {}", subServer);
+            socket.connect(subServer);
+
+            LOG.trace("Subscribe");
+            socket.subscribe(new byte[0]);
+            for (int i = 0; i < 5; i++) {
+                try {
+                    byte[] receivedData = socket.recv(0);
+                    LOG.trace("Recived data: {}", receivedData);
+                    if (receivedData == null) continue;
+                    String market_json = new String(decompress(receivedData), "UTF-8");
+                    LOG.trace("JSON: {}", market_json);
+                } catch (ZMQException | UnsupportedEncodingException ex) {
+                    LOG.error("Error on get data from EMDN", ex);
+                }
+            }
+        }
+        context.term();
+    }
+
+    private byte[] decompress(byte[] input){
+        byte[] decompressed = new byte[input.length * 16];
+        int decompressedLength = 0;
+        Inflater inflater = new Inflater();
+        try {
+            inflater.setInput(input);
+            decompressedLength = inflater.inflate(decompressed);
+        } catch (DataFormatException e) {
+            LOG.error("Error on decompress raw data {}", input);
+            LOG.error("",e);
+        } finally {
+            inflater.end();
+        }
+        byte[] res = new byte[decompressedLength];
+        System.arraycopy(decompressed, 0, res, 0, decompressedLength);
+        return res;
+    }
+}