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feat: add more covariance to methods; rename more methods 🧬
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oldratlee committed Apr 24, 2024
1 parent 0735068 commit 3429f4c
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44 changes: 22 additions & 22 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -70,18 +70,18 @@

- ☘️ **补全业务使用中缺失的功能**
- 更方便的功能,如
- `cffuAllOf`/`allOfWithResult`方法:返回多个`CF`的结果,而不是无返回结果`Void``allOf`
- `cffuCombine`/`combine`方法:返回多个`CF`不同类型的结果,而不是同一类型(`cffuAllOf`/`allOfWithResult`
- `allResultsOf`方法:返回多个`CF`的结果,而不是无返回结果`Void``CompletableFuture#allOf()`
- `cffuCombine`/`combine`方法:返回多个`CF`不同类型的结果,而不是同一类型(`allResultsOf`
- 更高效灵活的并发执行策略,如
- `cffuAllOfFastFail`/`allOfFastFail`方法:有`CF`失败时快速返回,而不再等待所有`CF`运行完成(`allOf`
- `cffuAnyOfSuccess`/`anyOfSuccess`方法:返回首个成功的`CF`结果,而不是首个完成(但可能失败)的`CF``anyOf`
- `allOfFastFail`方法:有`CF`失败时快速返回,而不再等待所有`CF`运行完成(`allOf`
- `anyOfSuccess`方法:返回首个成功的`CF`结果,而不是首个完成(但可能失败)的`CF``anyOf`
- 更安全的使用方式,如
- 支持设置缺省的业务线程池(`CffuFactoryBuilder#newCffuFactoryBuilder(executor)`方法)
- `cffuJoin(timeout, unit)`方法:支持超时的`join`的方法
- `join(timeout, unit)`方法:支持超时的`join`的方法
- 支持禁止强制篡改(`CffuFactoryBuilder#forbidObtrudeMethods`方法)
- 在类方法附加完善的代码质量注解(如`@NonNull``@Nullable``@CheckReturnValue``@Contract`等),在编码时`IDE`能尽早提示出问题
- 💪 **已有功能的增强**,如
- `cffuAnyOf`/`anyOfWithType`方法:返回类型是`T`(类型安全),而不是返回`Object``anyOf`
- `anyOf`方法:返回类型是`T`(类型安全),而不是返回`Object``CompletableFuture#anyOf()`
-**`Backport`支持`Java 8`**`Java 9+`高版本的所有`CF`新功能在`Java 8`等低`Java`版本直接可用,如
- 超时控制:`orTimeout`/`completeOnTimeout`方法
- 延迟执行:`delayedExecutor`方法
Expand Down Expand Up @@ -182,7 +182,7 @@ public class CffuDemo {
final Cffu<Integer> combined = longTaskA.thenCombine(longTaskB, Integer::sum)
.orTimeout(1500, TimeUnit.MILLISECONDS);
System.out.println("combined result: " + combined.get());
final Cffu<Integer> anyOfSuccess = cffuFactory.cffuAnyOfSuccess(longTaskC, longFailedTask);
final Cffu<Integer> anyOfSuccess = cffuFactory.anyOfSuccess(longTaskC, longFailedTask);
System.out.println("anyOfSuccess result: " + anyOfSuccess.get());
}
}
Expand Down Expand Up @@ -277,7 +277,7 @@ fun main() {
`CompletableFuture``allOf`方法没有返回结果,只是返回`Void`,不方便获得所运行的多个`CF`结果。
\# 要再通过入参`CF``get`方法来获取结果。

`cffu``cffuAllOf`/`allOfWithResult`方法提供了返回多个`CF`结果的功能。
`cffu``allResultsOf`方法提供了返回多个`CF`结果的功能。

示例代码如下:

Expand All @@ -288,7 +288,7 @@ public class AllOfWithResultDemo {

public static void main(String[] args) {
//////////////////////////////////////////////////
// CffuFactory#cffuAllOf
// CffuFactory#allOf
//////////////////////////////////////////////////
Cffu<Integer> cffu1 = cffuFactory.completedFuture(21);
Cffu<Integer> cffu2 = cffuFactory.completedFuture(42);
Expand All @@ -298,20 +298,20 @@ public class AllOfWithResultDemo {
// the result can be got by input argument `cf1.get()`, but it's cumbersome.
// so we can see a lot the util methods to enhance allOf with result in our project.

Cffu<List<Integer>> allOfWithResult = cffuFactory.cffuAllOf(cffu1, cffu2);
System.out.println(allOfWithResult.get());
Cffu<List<Integer>> allResults = cffuFactory.allResultsOf(cffu1, cffu2);
System.out.println(allResults.get());

//////////////////////////////////////////////////
// or CompletableFutureUtils#allOfWithResult
// or CompletableFutureUtils#allResultsOf
//////////////////////////////////////////////////
CompletableFuture<Integer> cf1 = CompletableFuture.completedFuture(21);
CompletableFuture<Integer> cf2 = CompletableFuture.completedFuture(42);

CompletableFuture<Void> allOf = CompletableFuture.allOf(cf1, cf2);
// Result type is Void!!

CompletableFuture<List<Integer>> allOfWithResult2 = CompletableFutureUtils.allOfWithResult(cf1, cf2);
System.out.println(allOfWithResult2.get());
CompletableFuture<List<Integer>> allResults2 = CompletableFutureUtils.allOfWithResult(cf1, cf2);
System.out.println(allResults2.get());
}
}
```
Expand Down Expand Up @@ -414,11 +414,11 @@ public class DefaultExecutorSettingForCffu {

- `CompletableFuture``allOf`方法会等待所有输入`CF`运行完成;即使有`CF`失败了也要等待后续`CF`运行完成,再返回一个失败的`CF`
- 对于业务逻辑来说,这样失败且继续等待策略,减慢了业务响应性;会希望如果有输入`CF`失败了,则快速失败不再做于事无补的等待
- `cffu`提供了相应的`cffuAllOfFastFail`/`allOfFastFail`方法
- `cffu`提供了相应的`allResultsOfFastFail`/`allOfFastFail`方法
- `allOf`/`allOfFastFail`两者都是,只有当所有的输入`CF`都成功时,才返回成功结果
- `CompletableFuture``anyOf`方法返回首个完成的`CF`(不会等待后续没有完成的`CF`,赛马模式);即使首个完成的`CF`是失败的,也会返回这个失败的`CF`结果。
- 对于业务逻辑来说,会希望赛马模式返回首个成功的`CF`结果,而不是首个完成但失败的`CF`
- `cffu`提供了相应的`cffuAnyOfSuccess`/`anyOfSuccess`方法
- `cffu`提供了相应的`anyOfSuccess`方法
- `anyOfSuccess`只有当所有的输入`CF`都失败时,才返回失败结果

> 📔 关于多个`CF`的并发执行策略,可以看看`JavaScript`规范[`Promise Concurrency`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise#promise_concurrency);在`JavaScript`中,`Promise`即对应`CompletableFuture`
Expand All @@ -443,8 +443,8 @@ public class ConcurrencyStrategyDemo {

public static void main(String[] args) throws Exception {
////////////////////////////////////////////////////////////////////////
// CffuFactory#cffuAllOfFastFail / allOfFastFail
// CffuFactory#cffuAnyOfSuccess / anyOfSuccess
// CffuFactory#allResultsOfFastFail / allOfFastFail
// CffuFactory#anyOfSuccess
////////////////////////////////////////////////////////////////////////
final Cffu<Integer> successAfterLongTime = cffuFactory.supplyAsync(() -> {
sleep(3000); // sleep LONG time
Expand All @@ -454,14 +454,14 @@ public class ConcurrencyStrategyDemo {

// Result type is Void!
Cffu<Void> cffuAll = cffuFactory.allOfFastFail(successAfterLongTime, failed);
Cffu<List<Integer>> fastFailed = cffuFactory.cffuAllOfFastFail(successAfterLongTime, failed);
Cffu<List<Integer>> fastFailed = cffuFactory.allResultsOfFastFail(successAfterLongTime, failed);
// fast failed without waiting successAfterLongTime
System.out.println(fastFailed.exceptionNow());

// Result type is Object!
Cffu<Object> cffuAny = cffuFactory.anyOfSuccess(successAfterLongTime, failed);
System.out.println(cffuAny.get());
Cffu<Integer> anyOfSuccess = cffuFactory.cffuAnyOfSuccess(successAfterLongTime, failed);
Cffu<Integer> anyOfSuccess = cffuFactory.anyOfSuccess(successAfterLongTime, failed);
System.out.println(anyOfSuccess.get());

////////////////////////////////////////////////////////////////////////
Expand Down Expand Up @@ -498,7 +498,7 @@ public class ConcurrencyStrategyDemo {
- 主业务逻辑阻塞,没有机会做相应的处理,以及时响应用户
- 会费掉一个线程,线程是很有限的资源(一般几百个),耗尽线程意味着服务瘫痪故障

`cffuJoin(timeout, unit)`方法即支持超时的`join`的方法;就像`cf.get(timeout, unit)` 之于 `cf.get()`
`join(timeout, unit)`方法即支持超时的`join`的方法;就像`cf.get(timeout, unit)` 之于 `cf.get()`

这个新方法使用简单类似,不附代码示例。

Expand All @@ -519,7 +519,7 @@ public class ConcurrencyStrategyDemo {

`CompletableFuture.anyOf`方法返回类型是`Object`,丢失具体类型,不够类型安全,使用时需要转型也不方便。

`cffu`提供了`cffuAnyOf`/`anyOfWithType`方法,返回类型是`T`(类型安全),而不是返回`Object``anyOf`)。
`cffu`提供了`anyOf`/`anyOf`方法,返回类型是`T`(类型安全),而不是返回`Object``CompletableFuture#anyOf()`)。

这个新方法使用简单类似,不附代码示例。

Expand Down
10 changes: 5 additions & 5 deletions cffu-core/src/main/java/io/foldright/cffu/Cffu.java
Original file line number Diff line number Diff line change
Expand Up @@ -1261,7 +1261,7 @@ public <U> Cffu<U> handleAsync(
* @throws ExecutionException if the computation threw an exception
* @throws InterruptedException if the current thread was interrupted while waiting
* @see #join()
* @see #cffuJoin(long, TimeUnit)
* @see #join(long, TimeUnit)
* @see #getNow(Object)
* @see #resultNow()
* @see #get(long, TimeUnit)
Expand All @@ -1286,7 +1286,7 @@ public T get() throws InterruptedException, ExecutionException {
* @throws ExecutionException if the computation threw an exception
* @throws InterruptedException if the current thread was interrupted while waiting
* @throws TimeoutException if the wait timed out
* @see #cffuJoin(long, TimeUnit)
* @see #join(long, TimeUnit)
* @see #getNow(Object)
* @see #resultNow()
* @see #join()
Expand All @@ -1312,7 +1312,7 @@ public T get(long timeout, TimeUnit unit) throws InterruptedException, Execution
* @throws CancellationException if the computation was cancelled
* @throws CompletionException if this future completed exceptionally
* or a completion computation threw an exception
* @see #cffuJoin(long, TimeUnit)
* @see #join(long, TimeUnit)
* @see #getNow(Object)
* @see #resultNow()
* @see #get(long, TimeUnit)
Expand Down Expand Up @@ -1363,7 +1363,7 @@ public T join() {
*/
@Blocking
@Nullable
public T cffuJoin(long timeout, TimeUnit unit) {
public T join(long timeout, TimeUnit unit) {
checkMinimalStage();

return CompletableFutureUtils.join(cf, timeout, unit);
Expand All @@ -1379,7 +1379,7 @@ public T cffuJoin(long timeout, TimeUnit unit) {
* @throws CompletionException if this future completed exceptionally
* or a completion computation threw an exception
* @see #resultNow()
* @see #cffuJoin(long, TimeUnit)
* @see #join(long, TimeUnit)
* @see #join()
* @see #get(long, TimeUnit)
* @see #get()
Expand Down
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