语音转写可能出现无限等待的问题

[umm233]

录音文件识别调用示例中，提交转写任务后，等到转写结果的方法可能出现死循环的问题。Java SDK 和Python SDK的实现方式是一样的，这里以Java为例，在com.alibaba.dashscope.api.AsynchronousApi::wait中，else逻辑处理并没有超时设置，某些异常情况下可能会无限等待，占用资源:

dashscope-sdk-java/src/main/java/com/alibaba/dashscope/api/AsynchronousApi.java

Lines 100 to 133 in 6dfff23

	while (true) {
	try {
	DashScopeResult taskResult = client.send(req);
	JsonObject output = (JsonObject) taskResult.getOutput();
	String taskStatus =
	output.get(TASK_STATUS) == null ? null : output.get(TASK_STATUS).getAsString();
	if (TaskStatus.FAILED.getValue().equals(taskStatus)
	|| TaskStatus.CANCELED.getValue().equals(taskStatus)
	|| TaskStatus.UNKNOWN.getValue().equals(taskStatus)) {
	return taskResult;
	} else if (TaskStatus.SUCCEEDED.getValue().equals(taskStatus)) {
	return taskResult;
	} else {
	// we start by querying once every second, and double the query interval after
	// every 3(increment_steps) intervals, until we hit the max waiting interval of 5(seconds）
	// TODO: investigate if we can use long-poll (server side return immediately when ready)
	step += 1;
	if (waitMilliseconds < maxWaitMilliseconds && step % incrementSteps == 0) {
	waitMilliseconds =
	waitMilliseconds * 2 > maxWaitMilliseconds
	? maxWaitMilliseconds
	: waitMilliseconds * 2;
	}
	try {
	Thread.sleep(waitMilliseconds);
	} catch (InterruptedException ignored) {
	}
	}
	} catch (ApiException e) {
	if (e.getStatus().getStatusCode() != HttpURLConnection.HTTP_UNAVAILABLE
	&& e.getStatus().getStatusCode() != HttpURLConnection.HTTP_GATEWAY_TIMEOUT) {
	throw e;
	}
	}

[lengjiayi]

异步查询示例
后续会加超时逻辑，可以先参考异步查询，用asyncCall+fetch，手动控制超时时间和查询间隔。