Question

我正在使用最新的Hazelcast v3.8，但在MultiTask包或任何其他包中找不到com.hazelcast.core。

最新版本的Hazelcast中MultiTask的替代品是什么？

我想控制我的任务运行的物理节点。我找到了Hazelcast distributed executor in use的一个很好的例子。

你可以看到很好的例子：

public void echoOnMembers(String input, Set<Member> members) throws Exception {
   MultiTask<String> task = new MultiTask<String>(new Echo(input), members);
   ExecutorService executorService = Hazelcast.getExecutorService();
   executorService.execute(task);
   Collection<String> results = task.get();
}

现在我想要相同的代码但是可以在v3.8上运行。请帮忙）

Answer 1

在3.0中删除了

MultiTask，以支持更具表现力，更直接的ExecutorService API。您可以使用以下IExecutorService方法：

void executeOnMembers(Runnable command, Collection<Member> members);
void executeOnMembers(Runnable command, MemberSelector memberSelector);
void executeOnAllMembers(Runnable command);

<T> Map<Member, Future<T>> submitToMembers(Callable<T> task, Collection<Member> members);
<T> Map<Member, Future<T>> submitToMembers(Callable<T> task, MemberSelector memberSelector);
<T> Map<Member, Future<T>> submitToAllMembers(Callable<T> task);

还有上述方法的回调版本。有关详情，请参阅： http://docs.hazelcast.org/docs/latest/javadoc/com/hazelcast/core/IExecutorService.html

echoOnMembers(...)示例的替代品是：

public void echoOnMembers( String input, Set<Member> members ) throws Exception {
  HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();
  IExecutorService executorService = 
      hazelcastInstance.getExecutorService( "default" );

  Map<Member, Future<String>> futures = executorService
      .submitToMembers( new Echo( input ), members );

  for ( Future<String> future : futures.values() ) {
    String echoResult = future.get();
    // ...
  }
}

有关详细信息，请参阅Hazelcast文档和代码示例： http://docs.hazelcast.org/docs/latest/manual/html-single/index.html#executing-code-in-the-cluster

https://github.com/hazelcast/hazelcast-code-samples/tree/master/distributed-executor

Hazelcast com.hazelcast.core.MultiTask在v3.8

1 个答案: