Try to add reconnect after buffer full test case for async sender

Author: cosmo0920

src/test/java/org/fluentd/logger/sender/TestAsyncRawSocketSender.java

@@ -337,4 +337,80 @@ public void process(MessagePack msgpack, Socket socket) throws IOException {
         assertTrue(event.data.keySet().contains("key0"));
         assertTrue(event.data.values().contains("v3"));
     }
+
+    @Test
+    public void testReconnectAfterBufferFull() throws Exception {
+        final CountDownLatch bufferFull = new CountDownLatch(1);
+
+        // start mock fluentd
+        int port = MockFluentd.randomPort(); // Use a random port available
+        final List<Event> elist = new ArrayList<Event>();
+        final MockFluentd fluentd = new MockFluentd(port, new MockFluentd.MockProcess() {
+            public void process(MessagePack msgpack, Socket socket) throws IOException {
+                try {
+                    BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
+                    Unpacker unpacker = msgpack.createUnpacker(in);
+                    while (true) {
+                        Event e = unpacker.read(Event.class);
+                        elist.add(e);
+                    }
+                } catch (EOFException e) {
+                    // ignore
+                } finally {
+                    socket.close();
+                }
+            }
+        });
+
+        ExecutorService executor = Executors.newSingleThreadExecutor();
+        executor.execute(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    bufferFull.await(20, TimeUnit.SECONDS);
+                    fluentd.start();
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        });
+
+        // start asyncSenders
+        Sender asyncSender = new AsyncRawSocketSender("localhost", port);
+        String tag = "tag";
+        int i;
+        for (i = 0; i < 1000000; i++) {     // Enough to fill the sender's buffer
+            Map<String, Object> record = new HashMap<String, Object>();
+            record.put("num", i);
+            record.put("str", "name" + i);
+
+            if (bufferFull.getCount() > 0) {
+                // Fill the sender's buffer
+                if (!asyncSender.emit(tag, record)) {
+                    // Buffer full. Need to recover the fluentd
+                    bufferFull.countDown();
+                    Thread.sleep(2000);
+                }
+            }
+            else {
+                // Flush the sender's buffer after the fluentd starts
+                asyncSender.emit(tag, record);
+                break;
+            }
+        }
+
+        // close sender sockets
+        asyncSender.close();
+
+        // wait for unpacking event data on fluentd
+        Thread.sleep(2000);
+
+        // close mock server sockets
+        fluentd.close();
+
+        // check data
+        assertEquals(0, bufferFull.getCount());
+        // check elist size. But, it cannot detect correct elist size because async sender runs independently.
+        assert(i - 5 <= elist.size()|| elist.size() < i + 5);
+    }
 }