bracket package:streamly

Run the alloc action IO b with async exceptions disabled but keeping blocking operations interruptible (see mask). Use the output b of the IO action as input to the function b -> Stream m a to generate an output stream. b is usually a resource under the IO monad, e.g. a file handle, that requires a cleanup after use. The cleanup action b -> m c, runs whenever (1) the stream ends normally, (2) due to a sync or async exception or, (3) if it gets garbage collected after a partial lazy evaluation. The exception is not caught, it is rethrown. bracket only guarantees that the cleanup action runs, and it runs with async exceptions enabled. The action must ensure that it can successfully cleanup the resource in the face of sync or async exceptions. When the stream ends normally or on a sync exception, cleanup action runs immediately in the current thread context, whereas in other cases it runs in the GC context, therefore, cleanup may be delayed until the GC gets to run. See also: bracket_ Inhibits stream fusion

Run the alloc action m b with async exceptions disabled but keeping blocking operations interruptible (see mask). Use the output b as input to b -> t m a to generate an output stream. b is usually a resource under the state of monad m, e.g. a file handle, that requires a cleanup after use. The cleanup action b -> m c, runs whenever the stream ends normally, due to a sync or async exception or if it gets garbage collected after a partial lazy evaluation. bracket only guarantees that the cleanup action runs, and it runs with async exceptions enabled. The action must ensure that it can successfully cleanup the resource in the face of sync or async exceptions. When the stream ends normally or on a sync exception, cleanup action runs immediately in the current thread context, whereas in other cases it runs in the GC context, therefore, cleanup may be delayed until the GC gets to run. See also: bracket_ Inhibits stream fusion

Run the alloc action a -> m c with async exceptions disabled but keeping blocking operations interruptible (see mask). Use the output c as input to Unfold m c b to generate an output stream. c is usually a resource under the state of monad m, e.g. a file handle, that requires a cleanup after use. The cleanup action c -> m d, runs whenever the stream ends normally, due to a sync or async exception or if it gets garbage collected after a partial lazy evaluation. bracket only guarantees that the cleanup action runs, and it runs with async exceptions enabled. The action must ensure that it can successfully cleanup the resource in the face of sync or async exceptions. When the stream ends normally or on a sync exception, cleanup action runs immediately in the current thread context, whereas in other cases it runs in the GC context, therefore, cleanup may be delayed until the GC gets to run. See also: bracket_, gbracket Inhibits stream fusion Pre-release

Like bracket but can use separate cleanup actions depending on the mode of termination. bracket' before onStop onGC onException action runs action using the result of before. If the stream stops, onStop action is executed, if the stream is abandoned onGC is executed, if the stream encounters an exception onException is executed. Pre-release

Like bracket but with following differences:

• alloc action m b runs with async exceptions enabled
• cleanup action b -> m c won't run if the stream is garbage collected after partial evaluation.
• does not require a MonadAsync constraint.
• has slightly better performance than bracket.

Inhibits stream fusion Pre-release

Like bracket but can use 3 separate cleanup actions depending on the mode of termination:

1. When the stream stops normally
2. When the stream is garbage collected
3. When the stream encounters an exception

bracket3 before onStop onGC onException action runs action using the result of before. If the stream stops, onStop action is executed, if the stream is abandoned onGC is executed, if the stream encounters an exception onException is executed. The exception is not caught, it is rethrown. Pre-release

Run the alloc action a -> m c with async exceptions disabled but keeping blocking operations interruptible (see mask). Use the output c as input to Unfold m c b to generate an output stream. When unfolding use the supplied try operation forall s. m s -> m (Either e s) to catch synchronous exceptions. If an exception occurs run the exception handling unfold Unfold m (c, e) b. The cleanup action c -> m d, runs whenever the stream ends normally, due to a sync or async exception or if it gets garbage collected after a partial lazy evaluation. See bracket for the semantics of the cleanup action. gbracket can express all other exception handling combinators. Inhibits stream fusion Pre-release