Comments (5)
The tests offer an example usage:
describe('Accepts custom cacheMap instance', () => {
class SimpleMap {
stash: Object;
constructor() {
this.stash = {};
}
get(key) {
return this.stash[key];
}
set(key, value) {
this.stash[key] = value;
}
delete(key) {
delete this.stash[key];
}
clear() {
this.stash = {};
}
}
it('Accepts a custom cache map implementation', async () => {
var aCustomMap = new SimpleMap();
var identityLoadCalls = [];
var identityLoader = new DataLoader(keys => {
identityLoadCalls.push(keys);
return Promise.resolve(keys);
}, { cacheMap: aCustomMap });
// Fetches as expected
var [ valueA, valueB1 ] = await Promise.all([
identityLoader.load('a'),
identityLoader.load('b'),
]);
expect(valueA).to.equal('a');
expect(valueB1).to.equal('b');
expect(identityLoadCalls).to.deep.equal([ [ 'a', 'b' ] ]);
expect(Object.keys(aCustomMap.stash)).to.deep.equal([ 'a', 'b' ]);
var [ valueC, valueB2 ] = await Promise.all([
identityLoader.load('c'),
identityLoader.load('b'),
]);
expect(valueC).to.equal('c');
expect(valueB2).to.equal('b');
expect(identityLoadCalls).to.deep.equal([ [ 'a', 'b' ], [ 'c' ] ]);
expect(Object.keys(aCustomMap.stash)).to.deep.equal([ 'a', 'b', 'c' ]);
// Supports clear
identityLoader.clear('b');
var valueB3 = await identityLoader.load('b');
expect(valueB3).to.equal('b');
expect(identityLoadCalls).to.deep.equal(
[ [ 'a', 'b' ], [ 'c' ], [ 'b' ] ]
);
expect(Object.keys(aCustomMap.stash)).to.deep.equal([ 'a', 'c', 'b' ]);
// Supports clear all
identityLoader.clearAll();
expect(Object.keys(aCustomMap.stash)).to.deep.equal([]);
});
});
});
The example in it is mainly:
describe('Accepts custom cacheMap instance', () => {
class SimpleMap {
stash: Object;
constructor() {
this.stash = {};
}
get(key) {
return this.stash[key];
}
set(key, value) {
this.stash[key] = value;
}
delete(key) {
delete this.stash[key];
}
clear() {
this.stash = {};
}
}
it('Accepts a custom cache map implementation', async () => {
var aCustomMap = new SimpleMap();
var identityLoadCalls = [];
var identityLoader = new DataLoader(keys => {
identityLoadCalls.push(keys);
return Promise.resolve(keys);
}, { cacheMap: aCustomMap });
So creating a class that implements get set delete and clear is sufficient that you can pass it into the dataloader as cacheMap. So you can create e.g. a class that uses redis in these methods to store or retrieve the value and you are good to go.
const dataloader = new DataLoader(keys => {
// the loader code
}, {cacheMap: myRedisObject});
from dataloader.
Got it, thanks for the reference. What about async cache sources, powered by something like Redis? Is that supported by data loader?
from dataloader.
Looking at the source code I'd say yes, but maybe just do a little test.
from dataloader.
Got it, thanks for the hint. Will close this for now then :)
from dataloader.
Here is a implementation that adds a Redis cache layer in place of the in memory cache.
https://www.npmjs.com/package/redis-cache-dataloader
from dataloader.
Related Issues (20)
- Move CI to GitHub Actions
- Setup publish token for CI
- Change default branch `master` to `main` HOT 1
- Setup Renovate Bot to keep dependencies up to date HOT 3
- [QUESTION] Why aren't keys being de-duplicated even when the cache is disabled? HOT 6
- ✨ [REQUEST]: Add examples for cacheKeyFn and cacheMap HOT 2
- [REQUEST]: How to pass auth headers to dataloader HOT 4
- [QUESTION] README.md doesn't show on npmjs.com HOT 2
- CacheMap.get calls should await the promised value HOT 1
- [QUESTION] Release changes? HOT 9
- [QUESTION] name is now required in options? HOT 4
- [BUG] Readme is missing from NPM HOT 2
- [BUG] `this` context not available in typescript definitions
- [BUG] Use caution with `jest.useFakeTimers()` HOT 1
- [REQUEST] support vercel edge functions by default HOT 4
- Ever considered the use of `queueMicrotask`? HOT 1
- Coalescing multiple load() calls HOT 3
- [REQUEST] Unify the way `load` and `loadMany` handle errors
- -
- [REQUEST] Add batch grouping
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