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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | 9x 9x 9x 9x 9x 7x 1x 7x 1x 1x 1x 6x 6x 6x 6x 9x 9x 6x 3x 3x 6x 3x 3x 3x 3x 3x 3x 1x 1x 1x 1x 1x 1x 3x 3x 3x | import {
InternalError,
OperationKeys,
BulkCrudOperationKeys,
} from "@decaf-ts/db-decorators";
import { ModelConstructor } from "@decaf-ts/decorator-validation";
import { Observable, Observer } from "../interfaces";
import { Adapter } from "./Adapter";
import { UnsupportedError } from "./errors";
import { Logger, Logging } from "@decaf-ts/logging";
import { EventIds } from "./types";
export class Dispatch<Y> implements Observable {
protected adapter?: Adapter<Y, any, any, any>;
protected native?: Y;
protected models!: ModelConstructor<any>[];
private logger!: Logger;
protected get log() {
if (!this.logger)
this.logger = Logging.for(this as any).for(this.adapter as any);
return this.logger;
}
constructor() {}
protected initialize(): void {
Iif (!this.adapter)
throw new InternalError(`No adapter observed for dispatch`);
const adapter = this.adapter as Adapter<Y, any, any, any>;
(
[
OperationKeys.CREATE,
OperationKeys.UPDATE,
OperationKeys.DELETE,
BulkCrudOperationKeys.CREATE_ALL,
BulkCrudOperationKeys.UPDATE_ALL,
BulkCrudOperationKeys.DELETE_ALL,
] as (keyof Adapter<Y, any, any, any>)[]
).forEach((method) => {
Iif (!adapter[method])
throw new InternalError(
`Method ${method} not found in ${adapter.alias} adapter to bind Observables Dispatch`
);
let descriptor = Object.getOwnPropertyDescriptor(adapter, method);
let proto: any = adapter;
while (!descriptor && proto !== Object.prototype) {
proto = Object.getPrototypeOf(proto);
descriptor = Object.getOwnPropertyDescriptor(proto, method);
}
Iif (!descriptor || !descriptor.writable) {
this.log.error(
`Could not find method ${method} to bind Observables Dispatch`
);
return;
}
function bulkToSingle(method: string) {
switch (method) {
case BulkCrudOperationKeys.CREATE_ALL:
return OperationKeys.CREATE;
case BulkCrudOperationKeys.UPDATE_ALL:
return OperationKeys.UPDATE;
case BulkCrudOperationKeys.DELETE_ALL:
return OperationKeys.DELETE;
default:
return method;
}
}
// @ts-expect-error because there are read only properties
adapter[method] = new Proxy(adapter[method], {
apply: async (target: any, thisArg, argArray: any[]) => {
const [tableName, ids] = argArray;
const result = await target.apply(thisArg, argArray);
this.updateObservers(tableName, bulkToSingle(method), ids as EventIds)
.then(() => {
this.log.verbose(
`Observer refresh dispatched by ${method} for ${tableName}`
);
this.log.debug(`pks: ${ids}`);
})
.catch((e: unknown) =>
this.log.error(
`Failed to dispatch observer refresh for ${method} on ${tableName}: ${e}`
)
);
return result;
},
});
});
}
observe(observer: Adapter<Y, any, any, any>): void {
Iif (!(observer instanceof Adapter))
throw new UnsupportedError("Only Adapters can be observed by dispatch");
this.adapter = observer;
this.native = observer.native;
this.models = Adapter.models(this.adapter.alias);
this.initialize();
this.log.verbose(`Dispatch initialized for ${this.adapter.alias} adapter`);
}
unObserve(observer: Observer): void {
Iif (this.adapter !== observer)
throw new UnsupportedError(
"Only the adapter that was used to observe can be unobserved"
);
this.adapter = undefined;
}
async updateObservers(
table: string,
event: OperationKeys | BulkCrudOperationKeys | string,
id: EventIds
): Promise<void> {
Iif (!this.adapter)
throw new InternalError(`No adapter observed for dispatch`);
try {
await this.adapter.refresh(table, event, id);
} catch (e: unknown) {
throw new InternalError(`Failed to refresh dispatch: ${e}`);
}
}
}
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