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import { Subject } from './Subject';
import { TimestampProvider } from './types';
import { Subscriber } from './Subscriber';
import { Subscription } from './Subscription';
import { dateTimestampProvider } from './scheduler/dateTimestampProvider';
/**
* A variant of {@link Subject} that "replays" old values to new subscribers by emitting them when they first subscribe.
*
* `ReplaySubject` has an internal buffer that will store a specified number of values that it has observed. Like `Subject`,
* `ReplaySubject` "observes" values by having them passed to its `next` method. When it observes a value, it will store that
* value for a time determined by the configuration of the `ReplaySubject`, as passed to its constructor.
*
* When a new subscriber subscribes to the `ReplaySubject` instance, it will synchronously emit all values in its buffer in
* a First-In-First-Out (FIFO) manner. The `ReplaySubject` will also complete, if it has observed completion; and it will
* error if it has observed an error.
*
* There are two main configuration items to be concerned with:
*
* 1. `bufferSize` - This will determine how many items are stored in the buffer, defaults to infinite.
* 2. `windowTime` - The amount of time to hold a value in the buffer before removing it from the buffer.
*
* Both configurations may exist simultaneously. So if you would like to buffer a maximum of 3 values, as long as the values
* are less than 2 seconds old, you could do so with a `new ReplaySubject(3, 2000)`.
*
* ### Differences with BehaviorSubject
*
* `BehaviorSubject` is similar to `new ReplaySubject(1)`, with a couple of exceptions:
*
* 1. `BehaviorSubject` comes "primed" with a single value upon construction.
* 2. `ReplaySubject` will replay values, even after observing an error, where `BehaviorSubject` will not.
*
* @see {@link Subject}
* @see {@link BehaviorSubject}
* @see {@link shareReplay}
*/
export class ReplaySubject<T> extends Subject<T> {
private _buffer: (T | number)[] = [];
private _infiniteTimeWindow = true;
/**
* @param _bufferSize The size of the buffer to replay on subscription
* @param _windowTime The amount of time the buffered items will stay buffered
* @param _timestampProvider An object with a `now()` method that provides the current timestamp. This is used to
* calculate the amount of time something has been buffered.
*/
constructor(
private _bufferSize = Infinity,
private _windowTime = Infinity,
private _timestampProvider: TimestampProvider = dateTimestampProvider
) {
super();
this._infiniteTimeWindow = _windowTime === Infinity;
this._bufferSize = Math.max(1, _bufferSize);
this._windowTime = Math.max(1, _windowTime);
}
next(value: T): void {
const { isStopped, _buffer, _infiniteTimeWindow, _timestampProvider, _windowTime } = this;
if (!isStopped) {
_buffer.push(value);
!_infiniteTimeWindow && _buffer.push(_timestampProvider.now() + _windowTime);
}
this._trimBuffer();
super.next(value);
}
/** @internal */
protected _subscribe(subscriber: Subscriber<T>): Subscription {
this._throwIfClosed();
this._trimBuffer();
const subscription = this._innerSubscribe(subscriber);
const { _infiniteTimeWindow, _buffer } = this;
// We use a copy here, so reentrant code does not mutate our array while we're
// emitting it to a new subscriber.
const copy = _buffer.slice();
for (let i = 0; i < copy.length && !subscriber.closed; i += _infiniteTimeWindow ? 1 : 2) {
subscriber.next(copy[i] as T);
}
this._checkFinalizedStatuses(subscriber);
return subscription;
}
private _trimBuffer() {
const { _bufferSize, _timestampProvider, _buffer, _infiniteTimeWindow } = this;
// If we don't have an infinite buffer size, and we're over the length,
// use splice to truncate the old buffer values off. Note that we have to
// double the size for instances where we're not using an infinite time window
// because we're storing the values and the timestamps in the same array.
const adjustedBufferSize = (_infiniteTimeWindow ? 1 : 2) * _bufferSize;
_bufferSize < Infinity && adjustedBufferSize < _buffer.length && _buffer.splice(0, _buffer.length - adjustedBufferSize);
// Now, if we're not in an infinite time window, remove all values where the time is
// older than what is allowed.
if (!_infiniteTimeWindow) {
const now = _timestampProvider.now();
let last = 0;
// Search the array for the first timestamp that isn't expired and
// truncate the buffer up to that point.
for (let i = 1; i < _buffer.length && (_buffer[i] as number) <= now; i += 2) {
last = i;
}
last && _buffer.splice(0, last + 1);
}
}
}