| // Copyright 2014 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| part of quiver.async; |
| |
| /// Returns a stream of completion events for the input [futures]. |
| /// |
| /// Successfully completed futures yield data events, while futures completed |
| /// with errors yield error events. |
| /// |
| /// The iterator obtained from [futures] is only advanced once the previous |
| /// future completes and yields an event. Thus, lazily creating the futures is |
| /// supported, for example: |
| /// |
| /// collect(files.map((file) => file.readAsString())); |
| /// |
| /// If you need to modify [futures], or a backing collection thereof, before |
| /// the returned stream is done, pass a copy instead to avoid a |
| /// [ConcurrentModificationError]: |
| /// |
| /// collect(files.toList().map((file) => file.readAsString())); |
| Stream collect(Iterable futures) => |
| new Stream.fromIterable(futures).asyncMap((f) => f); |
