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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import XCTest
import NIO
final class AdaptiveRecvByteBufferAllocatorTest: XCTestCase {
private let allocator = ByteBufferAllocator()
private var adaptive: AdaptiveRecvByteBufferAllocator!
private var fixed: FixedSizeRecvByteBufferAllocator!
override func setUp() {
self.adaptive = AdaptiveRecvByteBufferAllocator(minimum: 64, initial: 1024, maximum: 16 * 1024)
self.fixed = FixedSizeRecvByteBufferAllocator(capacity: 1024)
}
override func tearDown() {
self.adaptive = nil
self.fixed = nil
}
func testAdaptive() throws {
let buffer = adaptive.buffer(allocator: allocator)
XCTAssertEqual(1024, buffer.capacity)
// We double every time.
testActualReadBytes(mayGrow: true, actualReadBytes: 1024, expectedCapacity: 2048)
testActualReadBytes(mayGrow: true, actualReadBytes: 16384, expectedCapacity: 4096)
testActualReadBytes(mayGrow: true, actualReadBytes: 16384, expectedCapacity: 8192)
testActualReadBytes(mayGrow: true, actualReadBytes: 16384, expectedCapacity: 16384)
// Will never go over maximum
testActualReadBytes(mayGrow: false, actualReadBytes: 32768, expectedCapacity: 16384)
// Shrinks if two successive reads below half happen
testActualReadBytes(mayGrow: false, actualReadBytes: 4096, expectedCapacity: 16384)
testActualReadBytes(mayGrow: false, actualReadBytes: 8192, expectedCapacity: 8192)
testActualReadBytes(mayGrow: false, actualReadBytes: 4096, expectedCapacity: 8192)
testActualReadBytes(mayGrow: false, actualReadBytes: 4096, expectedCapacity: 4096)
// But not if an intermediate read is above half.
testActualReadBytes(mayGrow: false, actualReadBytes: 2048, expectedCapacity: 4096)
testActualReadBytes(mayGrow: false, actualReadBytes: 2049, expectedCapacity: 4096)
testActualReadBytes(mayGrow: false, actualReadBytes: 2048, expectedCapacity: 4096)
// Or if we grow in-between.
testActualReadBytes(mayGrow: true, actualReadBytes: 4096, expectedCapacity: 8192)
testActualReadBytes(mayGrow: false, actualReadBytes: 4096, expectedCapacity: 8192)
testActualReadBytes(mayGrow: false, actualReadBytes: 4096, expectedCapacity: 4096)
// Reads above half never shrink the capacity
for _ in 0..<10 {
testActualReadBytes(mayGrow: false, actualReadBytes: 2049, expectedCapacity: 4096)
}
// Consistently reading below half does shrink all the way down.
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 4096)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 2048)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 2048)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 1024)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 1024)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 512)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 512)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 256)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 256)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 128)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 128)
testActualReadBytes(mayGrow: false, actualReadBytes: 64, expectedCapacity: 64)
// Until the bottom, where it stays forever.
for _ in 0..<10 {
testActualReadBytes(mayGrow: false, actualReadBytes: 1, expectedCapacity: 64)
}
}
private func testActualReadBytes(mayGrow: Bool, actualReadBytes: Int, expectedCapacity: Int, file: StaticString = #file, line: UInt = #line) {
XCTAssertEqual(mayGrow, adaptive.record(actualReadBytes: actualReadBytes), "unexpected value for mayGrow", file: file, line: line)
let buffer = adaptive.buffer(allocator: allocator)
XCTAssertEqual(expectedCapacity, buffer.capacity, "unexpected capacity", file: file, line: line)
}
func testFixed() throws {
var buffer = fixed.buffer(allocator: allocator)
XCTAssertEqual(fixed.capacity, buffer.capacity)
XCTAssert(!fixed.record(actualReadBytes: 32768))
buffer = fixed.buffer(allocator: allocator)
XCTAssertEqual(fixed.capacity, buffer.capacity)
XCTAssert(!fixed.record(actualReadBytes: 64))
buffer = fixed.buffer(allocator: allocator)
XCTAssertEqual(fixed.capacity, buffer.capacity)
}
func testMaxAllocSizeIsIntMax() {
// To find the max alloc size, we're going to search for a fixed point in resizing. To do that we're just going to
// keep saying we read max until we can't resize any longer.
self.adaptive = AdaptiveRecvByteBufferAllocator(minimum: 0, initial: .max / 2, maximum: .max)
var mayGrow = true
while mayGrow {
mayGrow = self.adaptive.record(actualReadBytes: .max)
}
let buffer = self.adaptive.buffer(allocator: self.allocator)
XCTAssertEqual(buffer.capacity, 1 << 30)
XCTAssertEqual(self.adaptive.maximum, 1 << 30)
XCTAssertEqual(self.adaptive.minimum, 0)
}
func testAdaptiveRoundsValues() {
let adaptive = AdaptiveRecvByteBufferAllocator(minimum: 9, initial: 677, maximum: 111111)
XCTAssertEqual(adaptive.minimum, 8)
XCTAssertEqual(adaptive.maximum, 131072)
XCTAssertEqual(adaptive.initial, 512)
}
func testSettingMinimumAboveMaxAllowed() {
guard let targetValue = Int(exactly: Int64.max / 2) else {
// On a 32-bit word platform, this test cannot do anything sensible.
return
}
let adaptive = AdaptiveRecvByteBufferAllocator(minimum: targetValue, initial: targetValue + 1, maximum: targetValue + 2)
XCTAssertEqual(adaptive.minimum, 1 << 30)
XCTAssertEqual(adaptive.maximum, 1 << 30)
XCTAssertEqual(adaptive.initial, 1 << 30)
}
}
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