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Pass callback down

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This commit is contained in:
Leonid Logvinov 2017-11-20 16:14:40 -06:00
parent d39c0bee39
commit 9745d5348c
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GPG Key ID: 0DD294BFDE8C95D4
1 changed files with 5 additions and 9 deletions
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14
packages/0x.js/src/order_watcher/expiration_watcher.ts
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@ -16,7 +16,6 @@ const DEFAULT_ORDER_EXPIRATION_CHECKING_INTERVAL_MS = 50;
export class ExpirationWatcher {
private orderHashRBTreeByExpiration: RBTree<string>;
private expiration: {[orderHash: string]: BigNumber} = {};
private callbackIfExists?: (orderHash: string) => void;
private orderExpirationCheckingIntervalMs: number;
private expirationMarginMs: number;
private orderExpirationCheckingIntervalIdIfExists?: NodeJS.Timer;
@ -31,12 +30,11 @@ export class ExpirationWatcher {
this.orderHashRBTreeByExpiration = new RBTree(comparator);
}
public subscribe(callback: (orderHash: string) => void): void {
if (!_.isUndefined(this.callbackIfExists)) {
if (!_.isUndefined(this.orderExpirationCheckingIntervalIdIfExists)) {
throw new Error(ZeroExError.SubscriptionAlreadyPresent);
}
this.callbackIfExists = callback;
this.orderExpirationCheckingIntervalIdIfExists = intervalUtils.setAsyncExcludingInterval(
this.pruneExpiredOrders.bind(this), this.orderExpirationCheckingIntervalMs,
this.pruneExpiredOrders.bind(this, callback), this.orderExpirationCheckingIntervalMs,
);
}
public unsubscribe(): void {
@ -44,7 +42,6 @@ export class ExpirationWatcher {
throw new Error(ZeroExError.SubscriptionNotFound);
}
intervalUtils.clearAsyncExcludingInterval(this.orderExpirationCheckingIntervalIdIfExists);
delete this.callbackIfExists;
delete this.orderExpirationCheckingIntervalIdIfExists;
}
public addOrder(orderHash: string, expirationUnixTimestampMs: BigNumber): void {
@ -55,19 +52,18 @@ export class ExpirationWatcher {
this.orderHashRBTreeByExpiration.remove(orderHash);
delete this.expiration[orderHash];
}
private pruneExpiredOrders(): void {
private pruneExpiredOrders(callback: (orderHash: string) => void): void {
const currentUnixTimestampMs = utils.getCurrentUnixTimestampMs();
while (
this.orderHashRBTreeByExpiration.size !== 0 &&
this.expiration[this.orderHashRBTreeByExpiration.min()].lessThan(
currentUnixTimestampMs.plus(this.expirationMarginMs),
) &&
!_.isUndefined(this.callbackIfExists)
)
) {
const orderHash = this.orderHashRBTreeByExpiration.min();
this.orderHashRBTreeByExpiration.remove(orderHash);
delete this.expiration[orderHash];
this.callbackIfExists(orderHash);
callback(orderHash);
}
}
}