-
Notifications
You must be signed in to change notification settings - Fork 1
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
10 changed files
with
254 additions
and
48 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| // Copyright 2024 The NATS Authors | ||
| // 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. | ||
|
|
||
| import Foundation | ||
| import NIO | ||
| import NIOConcurrencyHelpers | ||
|
|
||
| class BatchBuffer { | ||
| private let batchSize: Int | ||
| private var buffer: ByteBuffer | ||
| private let channel: Channel | ||
| private let lock = NIOLock() | ||
| private var waitingPromises: [EventLoopPromise<Void>] = [] | ||
| private var isWriteInProgress: Bool = false | ||
|
|
||
| init(channel: Channel, batchSize: Int = 16*1024) { | ||
| self.batchSize = batchSize | ||
| self.buffer = channel.allocator.buffer(capacity: batchSize) | ||
| self.channel = channel | ||
| } | ||
|
|
||
| func write<Bytes: Sequence>(_ data: Bytes) async throws where Bytes.Element == UInt8 { | ||
| #if SWIFT_NATS_BATCH_BUFFER_DISABLED | ||
| let b = channel.allocator.buffer(bytes: data) | ||
| try await channel.writeAndFlush(b) | ||
| #else | ||
| // Batch writes and if we have more than the batch size | ||
| // already in the buffer await until buffer is flushed | ||
| // to handle any back pressure | ||
| try await withCheckedThrowingContinuation { continuation in | ||
| self.lock.withLock { | ||
| guard self.buffer.readableBytes < self.batchSize else { | ||
| let promise = self.channel.eventLoop.makePromise(of: Void.self) | ||
| promise.futureResult.whenComplete { result in | ||
| switch result { | ||
| case .success: | ||
| // we should be in lock when completed here | ||
| self.buffer.writeBytes(data) | ||
| self.flushWhenIdle() | ||
| continuation.resume() | ||
| case .failure(let error): | ||
| continuation.resume(throwing: error) | ||
| } | ||
| } | ||
| waitingPromises.append(promise) | ||
| return | ||
| } | ||
|
|
||
| self.buffer.writeBytes(data) | ||
| continuation.resume() | ||
| } | ||
|
|
||
| flushWhenIdle() | ||
| } | ||
| #endif | ||
| } | ||
|
|
||
| func clear() { | ||
| lock.withLock { | ||
| self.buffer.clear() | ||
| } | ||
| } | ||
|
|
||
| private func flushWhenIdle() { | ||
| channel.eventLoop.execute { | ||
|
|
||
| // We have to use lock/unlock calls rather than the withLock | ||
| // since we need writeBuffer reference | ||
| self.lock.lock() | ||
|
|
||
| // The idea is to keep writing to the buffer while a writeAndFlush() is | ||
| // in progress, so we can batch as many messages as possible. | ||
| guard !self.isWriteInProgress else { | ||
| self.lock.unlock() | ||
| return | ||
| } | ||
|
|
||
| // We need a separate write buffer so we can free the message buffer for more | ||
| // messages to be collected. | ||
| guard let writeBuffer = self.getWriteBuffer() else { | ||
| self.lock.unlock() | ||
| return | ||
| } | ||
|
|
||
| self.isWriteInProgress = true | ||
|
|
||
| self.lock.unlock() | ||
|
|
||
| let writePromise = self.channel.eventLoop.makePromise(of: Void.self) | ||
| writePromise.futureResult.whenComplete { result in | ||
| self.lock.withLock { | ||
| self.isWriteInProgress = false | ||
| switch result { | ||
| case .success: | ||
| self.waitingPromises.forEach { $0.succeed(()) } | ||
| self.waitingPromises.removeAll() | ||
| case .failure(let error): | ||
| self.waitingPromises.forEach { $0.fail(error) } | ||
| self.waitingPromises.removeAll() | ||
| } | ||
|
|
||
| // Check if there are any pending flushes | ||
| if self.buffer.readableBytes > 0 { | ||
| self.flushWhenIdle() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| self.channel.writeAndFlush(writeBuffer, promise: writePromise) | ||
| } | ||
| } | ||
|
|
||
| private func getWriteBuffer() -> ByteBuffer? { | ||
| guard buffer.readableBytes > 0 else { | ||
| return nil | ||
| } | ||
|
|
||
| var writeBuffer = channel.allocator.buffer(capacity: buffer.readableBytes) | ||
| writeBuffer.writeBytes(buffer.readableBytesView) | ||
| buffer.clear() | ||
|
|
||
| return writeBuffer | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.