我对可调用界面相当陌生。我有一些代码目前无法编译，只是需要一些帮助来了解原因......
public List<String> getNonPingableRegisters (Collection<RegisterReplicationSynchTime> nonReplicatingRegisters) throws IOException {
int nThreads = 15;
final ExecutorService es = Executors.newFixedThreadPool(nThreads);
Collection<Callable<PingTask>> pingTasks = new ArrayList<Callable<PingTask>>(nonReplicatingRegisters.size());
for (RegisterReplicationSynchTime nonReplicatingRegister : nonReplicatingRegisters) {
pingTasks.add(new PingTask(nonReplicatingRegister.getRegisterName()));
}
List<Future<String>> taskResults = es.invokeAll(pingTasks);
List<String> results = new ArrayList<String>();
for (Future<String> taskResult : taskResults) {
try {
String output = taskResult.get();
if (StringUtils.isNotEmpty(output) ) {
results.add(output);
}
} catch (InterruptedException e) {
// handle accordingly
} catch (ExecutionException e) {
// handle accordingly
}
}
return results;
}
PingTask 在哪里...
public class PingTask implements Callable<String> {
private String hostname = null;
public PingTask(String hostname) {
this.hostname = hostname;
}
public String call() {
Socket socket = null;
boolean reachable = false;
try {
socket = new Socket();
socket.connect(new InetSocketAddress(hostname, 139), 1000); //1 sec timeout
reachable = true;
socket.close();
} catch (IOException e) {
}
finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
}
}
}
return (reachable ? "" : hostname);
}
}
编译错误位于...
List<Future<String>> taskResults = es.invokeAll(pingTasks);
类型 Collection> 中的方法 add(Callable) 不适用于参数 (PingTask) StoreReplicationSynchtimeManagerImpl.java
不确定我需要在这里做什么来调用invokeAll。希望得到一些帮助。
谢谢
最佳答案
错误不在该行。 它位于:
pingTasks.add(new PingTask(nonReplicatingRegister.getRegisterName()));
您的集合是 Callable 的，因为您的 PingTask 类实现了 Callable。将集合更改为:
Collection<Callable<String>>
关于java - 执行器服务invokeAll，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35284282/