1 files changed, 65 insertions, 0 deletions
diff --git a/packages/order-utils/src/store/order_filled_cancelled_lazy_store.ts b/packages/order-utils/src/store/order_filled_cancelled_lazy_store.ts
new file mode 100644
index 000000000..4b1ad70b6
--- /dev/null
+++ b/packages/order-utils/src/store/order_filled_cancelled_lazy_store.ts
@@ -0,0 +1,65 @@
+import { BigNumber } from '@0xproject/utils';
+import * as _ from 'lodash';
+
+import { AbstractOrderFilledCancelledFetcher } from '../abstract/abstract_order_filled_cancelled_fetcher';
+import { AbstractOrderFilledCancelledLazyStore } from '../abstract/abstract_order_filled_cancelled_lazy_store';
+
+/**
+ * Copy on read store for balances/proxyAllowances of tokens/accounts
+ */
+export class OrderFilledCancelledLazyStore implements AbstractOrderFilledCancelledLazyStore {
+    private _orderFilledCancelledFetcher: AbstractOrderFilledCancelledFetcher;
+    private _filledTakerAmount: {
+        [orderHash: string]: BigNumber;
+    };
+    private _isCancelled: {
+        [orderHash: string]: boolean;
+    };
+    constructor(orderFilledCancelledFetcher: AbstractOrderFilledCancelledFetcher) {
+        this._orderFilledCancelledFetcher = orderFilledCancelledFetcher;
+        this._filledTakerAmount = {};
+        this._isCancelled = {};
+    }
+    public async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber> {
+        if (_.isUndefined(this._filledTakerAmount[orderHash])) {
+            const filledTakerAmount = await this._orderFilledCancelledFetcher.getFilledTakerAmountAsync(orderHash);
+            this.setFilledTakerAmount(orderHash, filledTakerAmount);
+        }
+        const cachedFilledTakerAmount = this._filledTakerAmount[orderHash];
+        return cachedFilledTakerAmount;
+    }
+    public setFilledTakerAmount(orderHash: string, filledTakerAmount: BigNumber): void {
+        this._filledTakerAmount[orderHash] = filledTakerAmount;
+    }
+    public deleteFilledTakerAmount(orderHash: string): void {
+        delete this._filledTakerAmount[orderHash];
+    }
+    public async getIsCancelledAsync(orderHash: string): Promise<boolean> {
+        if (_.isUndefined(this._isCancelled[orderHash])) {
+            const isCancelled = await this._orderFilledCancelledFetcher.isOrderCancelledAsync(orderHash);
+            this.setIsCancelled(orderHash, isCancelled);
+        }
+        const cachedIsCancelled = this._isCancelled[orderHash]; // tslint:disable-line:boolean-naming
+        return cachedIsCancelled;
+    }
+    public setIsCancelled(orderHash: string, isCancelled: boolean): void {
+        this._isCancelled[orderHash] = isCancelled;
+    }
+    public deleteIsCancelled(orderHash: string): void {
+        delete this._isCancelled[orderHash];
+    }
+    public deleteAll(): void {
+        this.deleteAllFilled();
+        this.deleteAllIsCancelled();
+    }
+    public deleteAllIsCancelled(): void {
+        this._isCancelled = {};
+    }
+    public deleteAllFilled(): void {
+        this._filledTakerAmount = {};
+    }
+    public getZRXAssetData(): string {
+        const zrxAssetData = this._orderFilledCancelledFetcher.getZRXAssetData();
+        return zrxAssetData;
+    }
+}