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Add promise support to AsyncStorage

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Summary:
Since `AsyncStorage` is the primary cache, it would be nice to stick with fetch's promise model and make the common use-case of:
1) check cache
2) make request if cache is invalid
more straightforward. Currently if I want to check a cache prior to using fetch (or another promise-based XHR lib) I have to provide a callback. I left the callback support and `resolve`/`reject` the promise after the callback has been applied.
Closes https://github.com/facebook/react-native/pull/593
Github Author: Rob McVey <mcvey@thecollective-la.com>

Test Plan: Imported from GitHub, without a `Test Plan:` line.
This commit is contained in:
Rob McVey
2015-04-07 02:02:05 -07:00
parent dc5be73a94
commit 2aa52880b7
2 changed files with 139 additions and 76 deletions
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43
Examples/UIExplorer/AsyncStorageExample.js
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@@ -29,16 +29,17 @@ var COLORS = ['red', 'orange', 'yellow', 'green', 'blue'];
var BasicStorageExample = React.createClass({
componentDidMount() {
AsyncStorage.getItem(STORAGE_KEY, (error, value) => {
if (error) {
this._appendMessage('AsyncStorage error: ' + error.message);
} else if (value !== null) {
this.setState({selectedValue: value});
this._appendMessage('Recovered selection from disk: ' + value);
} else {
this._appendMessage('Initialized with no selection on disk.');
}
});
AsyncStorage.getItem(STORAGE_KEY)
.then((value) => {
if (value !== null){
this.setState({selectedValue: value});
this._appendMessage('Recovered selection from disk: ' + value);
} else {
this._appendMessage('Initialized with no selection on disk.');
}
})
.catch((error) => this._appendMessage('AsyncStorage error: ' + error.message))
.done();
},
getInitialState() {
return {
@@ -81,23 +82,17 @@ var BasicStorageExample = React.createClass({
_onValueChange(selectedValue) {
this.setState({selectedValue});
AsyncStorage.setItem(STORAGE_KEY, selectedValue, (error) => {
if (error) {
this._appendMessage('AsyncStorage error: ' + error.message);
} else {
this._appendMessage('Saved selection to disk: ' + selectedValue);
}
});
AsyncStorage.setItem(STORAGE_KEY, selectedValue)
.then(() => this._appendMessage('Saved selection to disk: ' + selectedValue))
.catch((error) => this._appendMessage('AsyncStorage error: ' + error.message))
.done();
},
_removeStorage() {
AsyncStorage.removeItem(STORAGE_KEY, (error) => {
if (error) {
this._appendMessage('AsyncStorage error: ' + error.message);
} else {
this._appendMessage('Selection removed from disk.');
}
});
AsyncStorage.removeItem(STORAGE_KEY)
.then(() => this._appendMessage('Selection removed from disk.'))
.catch((error) => { this._appendMessage('AsyncStorage error: ' + error.message) })
.done();
},
_appendMessage(message) {