[−][src]Struct erdos::dataflow::stream::ReadStream
Allows reading from a stream and registering callbacks.
Passed as an argument to Operator::new
and Operator::connect
.
Also used in the driver to construct a dataflow.
Implementations
impl<D: Data> ReadStream<D>
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pub fn new() -> Self
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Create a stream into which we can write data.
pub fn add_callback<F: 'static + Fn(&Timestamp, &D)>(&self, callback: F)
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Add a callback to be invoked when the stream receives a message.
pub fn add_watermark_callback<F: 'static + Fn(&Timestamp)>(&self, callback: F)
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Add a callback to be invoked after the stream received, and the operator processed all the messages with a timestamp.
pub fn add_state<S: State>(&self, state: S) -> StatefulReadStream<D, S>
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Returns a new instance of the stream with an associated state.
This state is accessible by callbacks added to the
StatefulReadStream
.
pub fn get_id(&self) -> StreamId
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pub fn get_name(&self) -> String
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pub fn is_closed(&self) -> bool
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pub fn try_read(&self) -> Result<Message<D>, TryReadError>
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Tries to read a message from a channel.
Returns an immutable reference, or None
if no messages are
available at the moment (i.e., non-blocking read).
pub fn read(&self) -> Result<Message<D>, ReadError>
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Blocking read. Returns None
if the stream doesn't have a receive endpoint.
Trait Implementations
impl<D: Clone + Data> Clone for ReadStream<D>
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impl<D: Default + Data> Default for ReadStream<D>
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impl<'_, D> From<&'_ IngestStream<D>> for ReadStream<D> where
D: Data + Deserialize<'a>,
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D: Data + Deserialize<'a>,
impl<'_, D> From<&'_ LoopStream<D>> for ReadStream<D> where
D: Data + Deserialize<'a>,
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D: Data + Deserialize<'a>,
impl<'_, D: Data> From<&'_ ReadStream<D>> for ReadStream<D>
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impl<'_, D: Data> From<&'_ ReadStream<D>> for Rc<RefCell<InternalReadStream<D>>>
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impl<'_, D: Data> From<&'_ WriteStream<D>> for ReadStream<D>
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impl<D: Data> From<Rc<RefCell<InternalReadStream<D>>>> for ReadStream<D>
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Auto Trait Implementations
impl<D> !RefUnwindSafe for ReadStream<D>
impl<D> !Send for ReadStream<D>
impl<D> !Sync for ReadStream<D>
impl<D> Unpin for ReadStream<D>
impl<D> !UnwindSafe for ReadStream<D>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> State for T where
T: 'static + Clone,
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T: 'static + Clone,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,