Struct opendal::layers::BlockingLayer
source · pub struct BlockingLayer { /* private fields */ }
Available on crate feature
layers-blocking
only.Expand description
Add blocking API support for non-blocking services.
§Notes
- Please only enable this layer when the underlying service does not support blocking.
§Examples
§In async context
BlockingLayer will use current async context’s runtime to handle the async calls.
#[tokio::main]
async fn main() -> Result<()> {
// Create fs backend builder.
let mut builder = services::S3::default().bucket("test").region("us-east-1");
// Build an `BlockingOperator` with blocking layer to start operating the storage.
let _: BlockingOperator = Operator::new(builder)?
.layer(BlockingLayer::create()?)
.finish()
.blocking();
Ok(())
}
§In async context with blocking functions
If BlockingLayer
is called in blocking function, please fetch a [tokio::runtime::EnterGuard
]
first. You can use [Handle::try_current
] first to get the handle and then call [Handle::enter
].
This often happens in the case that async function calls blocking function.
#[tokio::main]
async fn main() -> Result<()> {
let _ = blocking_fn()?;
Ok(())
}
fn blocking_fn() -> Result<BlockingOperator> {
// Create fs backend builder.
let mut builder = services::S3::default().bucket("test").region("us-east-1");
let handle = tokio::runtime::Handle::try_current().unwrap();
let _guard = handle.enter();
// Build an `BlockingOperator` with blocking layer to start operating the storage.
let op: BlockingOperator = Operator::new(builder)?
.layer(BlockingLayer::create()?)
.finish()
.blocking();
Ok(op)
}
§In blocking context
In a pure blocking context, we can create a runtime and use it to create the BlockingLayer
.
The following code uses a global statically created runtime as an example, please manage the runtime on demand.
static RUNTIME: Lazy<tokio::runtime::Runtime> = Lazy::new(|| {
tokio::runtime::Builder::new_multi_thread()
.enable_all()
.build()
.unwrap()
});
fn main() -> Result<()> {
// Create fs backend builder.
let mut builder = services::S3::default().bucket("test").region("us-east-1");
// Fetch the `EnterGuard` from global runtime.
let _guard = RUNTIME.enter();
// Build an `BlockingOperator` with blocking layer to start operating the storage.
let _: BlockingOperator = Operator::new(builder)?
.layer(BlockingLayer::create()?)
.finish()
.blocking();
Ok(())
}
Implementations§
Trait Implementations§
source§impl Clone for BlockingLayer
impl Clone for BlockingLayer
source§fn clone(&self) -> BlockingLayer
fn clone(&self) -> BlockingLayer
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for BlockingLayer
impl Debug for BlockingLayer
source§impl<A: Access> Layer<A> for BlockingLayer
impl<A: Access> Layer<A> for BlockingLayer
§type LayeredAccess = BlockingAccessor<A>
type LayeredAccess = BlockingAccessor<A>
The layered accessor that returned by this layer.
source§fn layer(&self, inner: A) -> Self::LayeredAccess
fn layer(&self, inner: A) -> Self::LayeredAccess
Intercept the operations on the underlying storage.
Auto Trait Implementations§
impl Freeze for BlockingLayer
impl !RefUnwindSafe for BlockingLayer
impl Send for BlockingLayer
impl Sync for BlockingLayer
impl Unpin for BlockingLayer
impl !UnwindSafe for BlockingLayer
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