add api for setting thread pool name

Change-Id: I93aeddc6783e6b03d2aa31aa8ca42059e253ba81

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.baidu.hugegraph</groupId>
     <artifactId>hugegraph-common</artifactId>
-    <version>1.5.2</version>
+    <version>1.5.3</version>
 
     <name>hugegraph-common</name>
     <url>https://github.com/hugegraph/hugegraph-common</url>
@@ -192,7 +192,7 @@
                         <manifestEntries>
                             <!-- Must be on one line, otherwise the automatic
                                  upgrade script cannot replace the version number -->
-                            <Implementation-Version>1.5.2.0</Implementation-Version>
+                            <Implementation-Version>1.5.3.0</Implementation-Version>
                         </manifestEntries>
                     </archive>
                 </configuration>

src/main/java/com/baidu/hugegraph/event/EventHub.java

@@ -26,7 +26,6 @@ import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 
@@ -36,6 +35,7 @@ import org.slf4j.Logger;
 
 import com.baidu.hugegraph.iterator.ExtendableIterator;
 import com.baidu.hugegraph.util.E;
+import com.baidu.hugegraph.util.ExecutorUtil;
 import com.baidu.hugegraph.util.Log;
 import com.google.common.collect.ImmutableList;
 
@@ -43,6 +43,7 @@ public class EventHub {
 
     private static final Logger LOG = Log.logger(EventHub.class);
 
+    public static final String EVENT_WORKER = "event-worker-%d";
     public static final String ANY_EVENT = "*";
 
     private static final List<EventListener> EMPTY = ImmutableList.of();
@@ -70,7 +71,7 @@ public class EventHub {
             return;
         }
         LOG.debug("Init pool(size {}) for EventHub", poolSize);
-        executor = Executors.newFixedThreadPool(poolSize);
+        executor = ExecutorUtil.newFixedThreadPool(poolSize, EVENT_WORKER);
     }
 
     public static synchronized boolean destroy(long timeout)

src/main/java/com/baidu/hugegraph/util/ExecutorUtil.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2017 HugeGraph Authors
+ *
+ * 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.baidu.hugegraph.util;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+
+import org.apache.commons.lang3.concurrent.BasicThreadFactory;
+
+public final class ExecutorUtil {
+
+    public static ExecutorService newFixedThreadPool(int size, String name) {
+        ThreadFactory factory = new BasicThreadFactory.Builder()
+                                                      .namingPattern(name)
+                                                      .build();
+        return Executors.newFixedThreadPool(size, factory);
+    }
+}