delta-store/src/inMemory/InMemoryChangeStore.ts

An API for a store with change records

import {ChangeRecord} from "../ChangeModel";
import {Subject} from 'rxjs/Subject';
import {ArrayChangeRecordIterator} from "../RepositoryApi";
import {ChangeListShareInfo} from "../SharingAdaptor";

/**
 * Created by Papa on 12/14/2016.
 */

export class InMemoryChangeStore {

	private changeListMap: {[name: string]: ChangeRecord[]} = {};

	_changesAddedSubjectMap: {[name: string]: Subject<ChangeRecord[]>} = {};

	addChangeList(
		changeListName: string
	): void {
		if (this.changeListMap[changeListName]) {
			throw `Change List '${changeListName}' already exists`;
		}
		this.changeListMap[changeListName] = [];
	}

	async addChanges(
		changeListName: string,
		changeRecords: ChangeRecord[]
	):Promise<void> {
		this.changeListMap[changeListName] = this.changeListMap[changeListName].concat(changeRecords);
		let changesAddedSubject = this._changesAddedSubjectMap[changeListName];
		if (changesAddedSubject) {
			changesAddedSubject.next(changeRecords);
		}
	}

	getChangeListInfos(): ChangeListShareInfo[] {
		let changeListInfos = [];
		for (let changeListName in this.changeListMap) {
			changeListInfos.push({
				name: changeListName,
				dbId: null
			});
		}
		return changeListInfos;
	}

	getAllChanges(changeListName:string):ChangeRecord[] {
		return this.changeListMap[changeListName];
	}

	getChangesAddedSubject(
		changeListName: string
	): Subject<ChangeRecord[]> {
		let changesAddedSubject = this._changesAddedSubjectMap[changeListName];
		if (!changesAddedSubject) {
			changesAddedSubject = new Subject<ChangeRecord[]>();
			this._changesAddedSubjectMap[changeListName] = changesAddedSubject;
		}
		return changesAddedSubject;
	}
}