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[#59] Fix non-deterministic node insertion
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,112 @@ | ||
| // Copyright (c) 2023 Alexey Mayshev. 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. | ||
|
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| package core | ||
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||
| import ( | ||
| "github.com/maypok86/otter/internal/generated/node" | ||
| ) | ||
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| // reason represents the reason for writing the item to the cache. | ||
| type reason uint8 | ||
|
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| const ( | ||
| addReason reason = iota + 1 | ||
| deleteReason | ||
| updateReason | ||
| clearReason | ||
| closeReason | ||
| ) | ||
|
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| // task is a set of information to update the cache: | ||
| // node, reason for write, difference after node cost change, etc. | ||
| type task[K comparable, V any] struct { | ||
| n node.Node[K, V] | ||
| old node.Node[K, V] | ||
| writeReason reason | ||
| } | ||
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| // newAddTask creates a task to add a node to policies. | ||
| func newAddTask[K comparable, V any](n node.Node[K, V]) task[K, V] { | ||
| return task[K, V]{ | ||
| n: n, | ||
| writeReason: addReason, | ||
| } | ||
| } | ||
|
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| // newDeleteTask creates a task to delete a node from policies. | ||
| func newDeleteTask[K comparable, V any](n node.Node[K, V]) task[K, V] { | ||
| return task[K, V]{ | ||
| n: n, | ||
| writeReason: deleteReason, | ||
| } | ||
| } | ||
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| // newUpdateTask creates a task to update the node in the policies. | ||
| func newUpdateTask[K comparable, V any](n, oldNode node.Node[K, V]) task[K, V] { | ||
| return task[K, V]{ | ||
| n: n, | ||
| old: oldNode, | ||
| writeReason: updateReason, | ||
| } | ||
| } | ||
|
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| // newClearTask creates a task to clear policies. | ||
| func newClearTask[K comparable, V any]() task[K, V] { | ||
| return task[K, V]{ | ||
| writeReason: clearReason, | ||
| } | ||
| } | ||
|
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| // newCloseTask creates a task to clear policies and stop all goroutines. | ||
| func newCloseTask[K comparable, V any]() task[K, V] { | ||
| return task[K, V]{ | ||
| writeReason: closeReason, | ||
| } | ||
| } | ||
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| // node returns the node contained in the task. If node was not specified, it returns nil. | ||
| func (t *task[K, V]) node() node.Node[K, V] { | ||
| return t.n | ||
| } | ||
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| // oldNode returns the old node contained in the task. If old node was not specified, it returns nil. | ||
| func (t *task[K, V]) oldNode() node.Node[K, V] { | ||
| return t.old | ||
| } | ||
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| // isAdd returns true if this is an add task. | ||
| func (t *task[K, V]) isAdd() bool { | ||
| return t.writeReason == addReason | ||
| } | ||
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| // isDelete returns true if this is a delete task. | ||
| func (t *task[K, V]) isDelete() bool { | ||
| return t.writeReason == deleteReason | ||
| } | ||
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| // isUpdate returns true if this is an update task. | ||
| func (t *task[K, V]) isUpdate() bool { | ||
| return t.writeReason == updateReason | ||
| } | ||
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| // isClear returns true if this is a clear task. | ||
| func (t *task[K, V]) isClear() bool { | ||
| return t.writeReason == clearReason | ||
| } | ||
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| // isClose returns true if this is a close task. | ||
| func (t *task[K, V]) isClose() bool { | ||
| return t.writeReason == closeReason | ||
| } |
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