示例
pool 1.5.2: Run at most N async operations at once in Dart with package:pool, keep the results lined up with the inputs, and know what the timeout actually guards
已验证示例 — pub pool 1.5.2: Run at most N async operations at once in Dart with package:pool, keep the results lined up with the inputs, and know what the…
sha256:16a15d010dc0f1c9e1ee0824cafd5bd1ed1eb32530f108bc856e8cc348fa9179
本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。
提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。
MIT-0
执行证据
声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。
- 证据依据
- 签名契约通过
- 验证回执
- 1
- 构建过它的签名密钥
- 1
声明的环境
dart 3 linux x64 dart 3 dart pub
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| dart 3 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-14 |
案例
HOW- 目标
- Run at most N async operations at once in Dart with package:pool, keep the results lined up with the inputs, and know what the timeout actually guards
- 符号
-
- Pool
- Pool.withResource
- Pool.request
- Pool.forEach
- Pool.close
- Pool.done
- Pool.isClosed
- PoolResource
- PoolResource.release
- PoolResource.allowRelease
- TimeoutException
- 环境
- dart 3
- 创建时间
- 2026-08-14T20:09:50Z
契约
- assert a Pool of two runs at most two bodies at once, and that a withResource body that throws still releases its slot, so the high-water mark afterwards is two and not one
- assert pool.forEach emits results in completion order rather than input order, so its list is a permutation of the inputs, while Future.wait over withResource keeps every result in position
- assert forEach holds every resource in the pool for the whole run, so an unrelated request on the same pool is blocked outright rather than throttled alongside it
- assert the default onError adds the error to the stream and carries on, and that returning false only drops the error, with all six elements processed either way
- assert toList on a forEach stream completes with the first error, discards the values already emitted and cancels the iteration, so the remaining elements are never attempted
- assert an error thrown while iterating the elements bypasses onError entirely and lands on the stream even when onError returns false
- assert the timeout is a pool-wide inactivity alarm that any request or release resets, so a starved caller waits nearly three times it, that it then fails every pending request at once with a TimeoutException carrying the configured duration, and that it never fires again for the life of the pool
- assert request() throws StateError synchronously on a closed pool while withResource puts the identical error into its returned future instead, and that close() is memoized to one future
- assert done completes only once the resources handed out before close are released
- assert allowRelease spends the resource token so a following release() throws StateError, that its callback runs only when the slot is wanted, and that a callback which throws completes the next caller's request() with that error and leaves the pool one usable resource short forever
- assert queued requests are answered in request order even when it is a later allowRelease callback that frees the slot
- assert Pool(0) and a negative limit throw ArgumentError from the constructor, and that queued waiters are served first in, first out
文件
- csx.json
- lib/throttle.dart
- pubspec.lock
- pubspec.yaml
- test/contract_test.dart