diff --git a/src/main/java/tccn/Event.java b/src/main/java/tccn/Event.java
index 4ab7a72..44890ee 100644
--- a/src/main/java/tccn/Event.java
+++ b/src/main/java/tccn/Event.java
@@ -15,8 +15,8 @@ public class Event<V> {
         this.value = value;
     }
 
-    public static <V> Event of(String topic, V value) {
-        return new Event<V>(topic, value);
+    public static <V> Event<V> of(String topic, V value) {
+        return new Event<>(topic, value);
     }
 
 
diff --git a/src/main/java/tccn/zhub/ZHubClient.java b/src/main/java/tccn/zhub/ZHubClient.java
index 6238987..99c226a 100644
--- a/src/main/java/tccn/zhub/ZHubClient.java
+++ b/src/main/java/tccn/zhub/ZHubClient.java
@@ -21,15 +21,14 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.UUID;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.LinkedBlockingQueue;
-import java.util.function.BiConsumer;
+import java.util.concurrent.*;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 @Component
 public class ZHubClient extends AbstractConsumer implements IConsumer, IProducer {
 
@@ -60,12 +59,6 @@ public class ZHubClient extends AbstractConsumer implements IConsumer, IProducer
     private final LinkedBlockingQueue<Event<String>> rpcCallQueue = new LinkedBlockingQueue<>(); // RPC CALL MSG
     private final LinkedBlockingQueue<String> sendMsgQueue = new LinkedBlockingQueue<>(); // SEND MSG
 
-    private final BiConsumer<Runnable, Integer> threadBuilder = (r, n) -> {
-        for (int i = 0; i < n; i++) {
-            new Thread(() -> r.run()).start();
-        }
-    };
-
     /*private static boolean isFirst = true;
     private boolean isMain = false;*/
     private static final Map<String, ZHubClient> mainHub = new HashMap<>(); // 127.0.0.1:1216 - ZHubClient
@@ -212,98 +205,117 @@ public class ZHubClient extends AbstractConsumer implements IConsumer, IProducer
         }).start();
 
         // 定时调度事件
-        threadBuilder.accept(() -> {
+        new Thread(() -> {
+            ExecutorService executor = Executors.newSingleThreadExecutor();
             while (true) {
                 Timer timer = null;
                 try {
-                    if ((timer = timerQueue.take()) == null) {
-                        return;
-                    }
+                    timer = timerQueue.take();
                     long start = System.currentTimeMillis();
-                    timer.runnable.run();
+                    executor.submit(timer.runnable).get(5, TimeUnit.SECONDS);
                     long end = System.currentTimeMillis();
                     logger.finest(String.format("timer [%s] : elapsed time %s ms", timer.name, end - start));
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                } catch (Exception e) {
-                    logger.log(Level.WARNING, "timer [" + timer.name + "]", e);
+                } catch (InterruptedException | ExecutionException | TimeoutException e) {
+                    if (e instanceof TimeoutException) {
+                        executor = Executors.newSingleThreadExecutor();
+                        logger.log(Level.WARNING, "TimeoutException [" + timer.name + "]", e);
+                    } else {
+                        e.printStackTrace();
+                    }
                 }
             }
-        }, 1);
+        }).start();
 
         // topic msg
-        threadBuilder.accept(() -> {
+        new Thread(() -> {
+            ExecutorService executor = Executors.newSingleThreadExecutor();
             while (true) {
                 Event<String> event = null;
                 try {
-                    if ((event = topicQueue.take()) == null) {
-                        continue;
-                    }
+                    event = topicQueue.take();
                     logger.log(Level.FINE, "topic[" + event.topic + "] :" + event.value);
-                    accept(event.topic, event.value);
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                } catch (Exception e) {
-                    logger.log(Level.WARNING, "topic[" + event.topic + "] event accept error :" + event.value, e);
+
+                    String topic = event.topic;
+                    String value = event.value;
+                    executor.submit(() -> accept(topic, value)).get(5, TimeUnit.SECONDS);
+                } catch (InterruptedException | ExecutionException | TimeoutException e) {
+                    if (e instanceof TimeoutException) {
+                        executor = Executors.newSingleThreadExecutor();
+                        logger.log(Level.WARNING, "TimeoutException, topic[" + event.topic + "], value[" + event.value + "]", e);
+                    } else if (event != null) {
+                        logger.log(Level.WARNING, "topic[" + event.topic + "] event accept error :" + event.value, e);
+                    }
                 }
             }
-        }, 1);
-
+        }, "ZHub-topic-accept").start();
         // rpc back
-        threadBuilder.accept(() -> {
+        new Thread(() -> {
+            ExecutorService executor = Executors.newSingleThreadExecutor();
             while (true) {
                 Event<String> event = null;
                 try {
-                    if ((event = rpcBackQueue.take()) == null) {
-                        continue;
-                    }
-                    //if (event)
+                    event = rpcBackQueue.take();
                     logger.info(String.format("rpc-back:[%s]: %s", event.topic, event.value));
                     rpcAccept(event.value);
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                } catch (Exception e) {
-                    logger.log(Level.WARNING, "rpc-back[" + event.topic + "] event accept error :" + event.value, e);
+
+                    String value = event.value;
+                    executor.submit(() -> rpcAccept(value)).get(5, TimeUnit.SECONDS);
+
+                } catch (InterruptedException | ExecutionException | TimeoutException e) {
+                    if (e instanceof TimeoutException) {
+                        executor = Executors.newSingleThreadExecutor();
+                        logger.log(Level.WARNING, "rpc-back TimeoutException, topic[" + event.topic + "], value[" + event.value + "]", e);
+                    } else if (event != null) {
+                        logger.log(Level.WARNING, "rpc-back[" + event.topic + "] event accept error :" + event.value, e);
+                    }
+                    throw new RuntimeException(e);
                 }
             }
-        }, 1);
+        }).start();
 
         // rpc call
-        threadBuilder.accept(() -> {
+        new Thread(() -> {
+            ExecutorService executor = Executors.newSingleThreadExecutor();
             while (true) {
                 Event<String> event = null;
                 try {
-                    if ((event = rpcCallQueue.take()) == null) {
-                        continue;
-                    }
+                    event = rpcCallQueue.take();
                     logger.info(String.format("rpc-call:[%s] %s", event.topic, event.value));
-                    accept(event.topic, event.value);
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                } catch (Exception e) {
-                    logger.log(Level.WARNING, "rpc-call[" + event.topic + "] event accept error :" + event.value, e);
+
+                    String topic = event.topic;
+                    String value = event.value;
+                    executor.submit(() -> accept(topic, value)).get(5, TimeUnit.SECONDS);
+                } catch (InterruptedException | ExecutionException | TimeoutException e) {
+                    if (e instanceof TimeoutException) {
+                        executor = Executors.newSingleThreadExecutor();
+                        logger.log(Level.WARNING, "rpc-call TimeoutException, topic[" + event.topic + "], value[" + event.value + "]", e);
+                    } else if (event != null) {
+                        logger.log(Level.WARNING, "rpc-call[" + event.topic + "] event accept error :" + event.value, e);
+                    }
                 }
             }
-        }, 1);
+        }, "ZHub-rpc-call").start();
 
         // send msg
-        threadBuilder.accept(() -> {
-            while (true) {
-                String msg = null;
+        new Thread(() -> {
+            String msg = null;
+            try {
+                msg = sendMsgQueue.take();
+                writer.write(msg.getBytes(UTF_8));
+                writer.flush();
+            } catch (InterruptedException | IOException e) {
+                logger.log(Level.WARNING, "send-msg[" + msg + "] event accept error :", e);
+
                 try {
-                    if ((msg = sendMsgQueue.take()) == null) {
-                        continue;
-                    }
-                    // logger.log(Level.FINEST, "send-msg: [" + msg + "]");
-                    writer.write(msg.getBytes());
+                    Thread.sleep(3000);
+                    assert msg != null;
+                    writer.write(msg.getBytes(UTF_8));
                     writer.flush();
-                } catch (InterruptedException e) {
+                } catch (IOException | InterruptedException | NullPointerException ex) {
                     e.printStackTrace();
-                } catch (Exception e) {
-                    logger.log(Level.WARNING, "send-msg[" + msg + "] event accept error :", e);
                 }
             }
-        }, 1);
+        });
 
     }