gorm.tools.async.Futures.groovy Maven / Gradle / Ivy
/*
* Copyright 2021 Yak.Works - Licensed under the Apache License, Version 2.0 (the "License")
* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
*/
package gorm.tools.async
import java.util.concurrent.CompletableFuture
import java.util.function.Supplier
import groovy.transform.CompileStatic
/**
* Helpers for creating CompletableFuture and for running async
*/
@CompileStatic
class Futures {
/**
* run the closure asyncronously, if session is needed use asynService.runAsync
* the runnable does not return a value but this returns a CompletableFuture
* so you can call .join to block
*/
static CompletableFuture runAsync(Runnable runnable){
return CompletableFuture.runAsync(runnable)
}
/**
* Creates a CompletableFuture passing supplier into supplyAsync
* if asyncEnabled is false then it runs the supplyAsync.get synchronously and blocks, will return a completedFuture when done
*
* @param asyncEnabled if true then it runs a normal supplyAsync aschronously
* @param supplier the supplier function or closure
* @return the CompletableFuture
*/
static CompletableFuture of(boolean asyncEnabled, Closure supplierClosure){
Supplier supplier = supplierClosure as Supplier
return Futures.of(asyncEnabled, supplier)
}
/**
* Creates a CompletableFuture passing supplier into supplyAsync
* if asyncEnabled is false then it runs the supplyAsync.get synchronously and blocks, will return a completedFuture when done
*
* @param asyncEnabled if true then it runs a normal supplyAsync aschronously
* @param supplier the supplier function or closure
* @return the CompletableFuture
*/
static CompletableFuture of(boolean asyncEnabled, Supplier supplier){
if(asyncEnabled){
return CompletableFuture.supplyAsync(supplier)
} else {
CompletableFuture syncFuture
//fake it but run it in same thread
try{
T res = supplier.get()
syncFuture = CompletableFuture.completedFuture(res)
} catch (e){
syncFuture = new CompletableFuture()
syncFuture.completeExceptionally(e)
}
return syncFuture
}
}
}