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@fluidframework/map
Advanced tools
When taking a dependency on a Fluid Framework library, we recommend using a ^
(caret) version range, such as ^1.3.4
.
While Fluid Framework libraries may use different ranges with interdependencies between other Fluid Framework libraries,
library consumers should always prefer ^
.
The SharedMap distributed data structure can be used to store key-value pairs. It provides the same API for setting and retrieving values that JavaScript developers are accustomed to with the Map built-in object.
To create a SharedMap
, call the static create method:
const myMap = SharedMap.create(this.runtime, id);
Unlike the JavaScript Map
, a SharedMap
's keys must be strings. The value must only be plain JS objects or handles (e.g. to another DDS or Fluid objects).
In collaborative scenarios, the value is settled with a policy of last write wins.
SharedMap
is an EventEmitter
, and will emit events when other clients make modifications. You should register for these events and respond appropriately as the data is modified. valueChanged
will be emitted in response to a set
or delete
, and provide the key and previous value that was stored at that key. clear
will be emitted in response to a clear
.
A SharedDirectory
is a map-like DDS that additionally supports storing key/value pairs within a tree of subdirectories. This subdirectory tree can be used to give hierarchical structure to stored key/value pairs rather than storing them on a flat map. Both the SharedDirectory
and any subdirectories are IDirectories
.
To create a SharedDirectory
, call the static create method:
const myDirectory = SharedDirectory.create(this.runtime, id);
The map operations on an IDirectory
refer to the key/value pairs stored in that IDirectory
, and function just like SharedMap
including the same extra functionality and restrictions on keys and values. To operate on the subdirectory structure, use the corresponding subdirectory methods.
getWorkingDirectory()
To "navigate" the subdirectory structure, IDirectory
provides a getWorkingDirectory
method which takes a relative path and returns the IDirectory
located at that path if it exists.
valueChanged
events additionally provide the absolute path to the subdirectory storing the value that changed.
dispose
events are fired on sub directory which is deleted. Any access to this sub directory will throw an error once it is disposed.
FAQs
Distributed map
The npm package @fluidframework/map receives a total of 9,943 weekly downloads. As such, @fluidframework/map popularity was classified as popular.
We found that @fluidframework/map demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
Did you know?
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