If the buffer is full when a new element is available this strategy backpressures the upstream publisher until space becomes available in the buffer.
If the buffer is full when a new element arrives, drops all the buffered elements to make space for the new element.
If the buffer is full when a new element arrives, drops the oldest element from the buffer to make space for the new element.
If the buffer is full when a new element arrives, drops the new element.
If the buffer is full when a new element arrives, drops the youngest element from the buffer to make space for the new element.
If the buffer is full when a new element is available this strategy send next element downstream without waiting
If the buffer is full when a new element is available this strategy completes the stream with failure.