Avoid to create thread pool many times.

init/src/main/java/cn/zhaiyifan/init/Init.java

@@ -18,6 +18,7 @@ public class Init {
  private static Context sContext;
  private static int mThreadPoolSize = DEFAULT_THREAD_POOL_SIZE;
 
+ private static ExecutorService mExecutorService;
  /**
  * Init with context.
  *
@@ -87,7 +88,10 @@ public static Context getContext() {
  * @param size thread pool size, value less or equal than 0 will produce a cached thread pool.
  */
  public static void setThreadPoolSize(int size) {
- mThreadPoolSize = size;
+ if(mThreadPoolSize != size){
+ mThreadPoolSize = size;
+ createThreadPool();
+ }
  }
 
  public static Flow getFlow(String flowName) {
@@ -157,10 +161,20 @@ public static int getFlowStatus(String flowName) {
  * @return thread pool
  */
  public static ExecutorService getThreadPool() {
+ if(mExecutorService == null){
+ createThreadPool();
+ }
+ return mExecutorService;
+ }
+
+ /**
+ * create a thread pool.
+ */
+ public static void createThreadPool(){
  if (mThreadPoolSize <= 0) {
- return Executors.newCachedThreadPool();
+ mExecutorService =  Executors.newCachedThreadPool();
  } else {
- return Executors.newFixedThreadPool(mThreadPoolSize);
+ mExecutorService = Executors.newFixedThreadPool(mThreadPoolSize);
  }
  }
 }