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package com.qcloud.cos.event;
/**
* Used to indicate whether it is safe to deliver progress events to the
* listener synchronously. In general, a progress listener should never block,
* which is a necessary condition for the safety for synchronous delivery.
*
* @see SyncProgressListener
*/
public interface DeliveryMode {
/**
* Returns true if it is safe to make a synchronous callback to the
* implementing listener without the risk of incurring undue latency; false
* otherwise.
*/
public boolean isSyncCallSafe();
/**
* Provides convenient method to check if a listener is safe to be invoked
* synchronously.
*/
public static class Check {
public static boolean isSyncCallSafe(ProgressListener listener) {
if (listener instanceof DeliveryMode) {
DeliveryMode mode = (DeliveryMode) listener;
return mode.isSyncCallSafe();
}
return listener == null;
}
}
}