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fix: remove cache from api-derive (#779)

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* Remove cache from api-derive

* Skip e2e

* Update headers to 2019
This commit is contained in:
Amaury Martiny
2019-03-15 12:45:50 +01:00
committed by Jaco Greeff
parent a74367e924
commit 3e43bc5ea9
7 changed files with 35 additions and 77 deletions
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packages/api-derive/src/util/cache.spec.ts
-30
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@@ -1,30 +0,0 @@
// Copyright 2017-2019 @polkadot/api-derive authors & contributors
// This software may be modified and distributed under the terms
// of the Apache-2.0 license. See the LICENSE file for details.
import { ApiInterface$Rx } from '@polkadot/api/types';
import { cache } from './cache';
describe('cache', () => {
const f = cache((api: ApiInterface$Rx) => (a: number, b: number) => [api, a, b]);
const api = {} as ApiInterface$Rx;
it('should hit cache when all arguments are the same', () => {
const first = f(api)(2, 3);
const second = f(api)(2, 3);
expect(first).toBe(second);
});
it('should not hit cache when some arguments are not the same', () => {
const first = f(api)(2, 3);
const second1 = f(api)(5, 3);
const second2 = f(api)(2, 5);
const second3 = f({} as ApiInterface$Rx)(2, 3);
expect(first).not.toBe(second1);
expect(first).not.toBe(second2);
expect(first).not.toBe(second3);
});
});
packages/api-derive/src/util/cache.ts
-31
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@@ -1,31 +0,0 @@
// Copyright 2017-2019 @polkadot/api-derive authors & contributors
// This software may be modified and distributed under the terms
// of the Apache-2.0 license. See the LICENSE file for details.
import memoizee from 'memoizee';
import { ApiInterface$Decorated } from '@polkadot/api/types';
import { Codec } from '@polkadot/types/types';
import { Observable } from 'rxjs';
/**
* Create memoization for a 2-currified function.
*
* @param fn - The function to memoize.
* @param map - The Map used to cache function returns.
* @example
* ```javascript
* const f = (api: ApiInterface$Rx) => (b: number) => a * b;
* const cached = cache(f);
* f(api)(1, 2);
* f(api)(1); // Cache not hit
* f({})(1, 2); // Cache not hit
* f(api)(1, 2); // Cache hit
* ```
*/
export const cache = (fn: Function, map = new WeakMap()) => (api: ApiInterface$Decorated<Observable<Codec>, Observable<Codec>>) => {
if (!map.has(api)) {
const innerFn = fn(api);
map.set(api, memoizee(innerFn));
}
return map.get(api);
};