84 lines
2.5 KiB
CoffeeScript
84 lines
2.5 KiB
CoffeeScript
EventEmitter = require('events').EventEmitter
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IDWeakMap = require 'id-weak-map'
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v8Util = process.atomBinding 'v8_util'
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# Class to reference all objects.
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class ObjectsStore
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@stores = {}
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constructor: ->
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@nextId = 0
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@objects = []
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getNextId: ->
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++@nextId
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add: (obj) ->
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id = @getNextId()
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@objects[id] = obj
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id
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has: (id) ->
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@objects[id]?
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remove: (id) ->
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throw new Error("Invalid key #{id} for ObjectsStore") unless @has id
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delete @objects[id]
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get: (id) ->
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throw new Error("Invalid key #{id} for ObjectsStore") unless @has id
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@objects[id]
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@forRenderView: (processId, routingId) ->
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key = "#{processId}_#{routingId}"
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@stores[key] = new ObjectsStore unless @stores[key]?
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@stores[key]
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@releaseForRenderView: (processId, routingId) ->
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key = "#{processId}_#{routingId}"
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delete @stores[key]
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class ObjectsRegistry extends EventEmitter
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constructor: ->
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@setMaxListeners Number.MAX_VALUE
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# Objects in weak map will be not referenced (so we won't leak memory), and
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# every object created in browser will have a unique id in weak map.
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@objectsWeakMap = new IDWeakMap
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@objectsWeakMap.add = (obj) ->
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id = IDWeakMap::add.call this, obj
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v8Util.setHiddenValue obj, 'atomId', id
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id
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# Register a new object, the object would be kept referenced until you release
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# it explicitly.
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add: (processId, routingId, obj) ->
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# Some native objects may already been added to objectsWeakMap, be care not
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# to add it twice.
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@objectsWeakMap.add obj unless v8Util.getHiddenValue obj, 'atomId'
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id = v8Util.getHiddenValue obj, 'atomId'
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# Store and reference the object, then return the storeId which points to
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# where the object is stored. The caller can later dereference the object
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# with the storeId.
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# We use a difference key because the same object can be referenced for
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# multiple times by the same renderer view.
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store = ObjectsStore.forRenderView processId, routingId
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storeId = store.add obj
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[id, storeId]
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# Get an object according to its id.
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get: (id) ->
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@objectsWeakMap.get id
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# Remove an object according to its storeId.
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remove: (processId, routingId, storeId) ->
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ObjectsStore.forRenderView(processId, routingId).remove storeId
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# Clear all references to objects from renderer view.
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clear: (processId, routingId) ->
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@emit "release-renderer-view-#{processId}-#{routingId}"
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ObjectsStore.releaseForRenderView processId, routingId
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module.exports = new ObjectsRegistry
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