work.suroh.tk/node_modules/rx/dist/rx.backpressure.js

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2019-12-02 12:22:45 +00:00
// Copyright (c) Microsoft, All rights reserved. See License.txt in the project root for license information.
;(function (factory) {
var objectTypes = {
'function': true,
'object': true
};
function checkGlobal(value) {
return (value && value.Object === Object) ? value : null;
}
var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) ? exports : null;
var freeModule = (objectTypes[typeof module] && module && !module.nodeType) ? module : null;
var freeGlobal = checkGlobal(freeExports && freeModule && typeof global === 'object' && global);
var freeSelf = checkGlobal(objectTypes[typeof self] && self);
var freeWindow = checkGlobal(objectTypes[typeof window] && window);
var moduleExports = (freeModule && freeModule.exports === freeExports) ? freeExports : null;
var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
var root = freeGlobal || ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) || freeSelf || thisGlobal || Function('return this')();
// Because of build optimizers
if (typeof define === 'function' && define.amd) {
define(['./rx'], function (Rx, exports) {
return factory(root, exports, Rx);
});
} else if (typeof module === 'object' && module && module.exports === freeExports) {
module.exports = factory(root, module.exports, require('./rx'));
} else {
root.Rx = factory(root, {}, root.Rx);
}
}.call(this, function (root, exp, Rx, undefined) {
// References
var Observable = Rx.Observable,
observableProto = Observable.prototype,
AnonymousObservable = Rx.AnonymousObservable,
AbstractObserver = Rx.internals.AbstractObserver,
CompositeDisposable = Rx.CompositeDisposable,
BinaryDisposable = Rx.BinaryDisposable,
NAryDisposable = Rx.NAryDisposable,
Notification = Rx.Notification,
Subject = Rx.Subject,
Observer = Rx.Observer,
disposableEmpty = Rx.Disposable.empty,
disposableCreate = Rx.Disposable.create,
inherits = Rx.internals.inherits,
addProperties = Rx.internals.addProperties,
defaultScheduler = Rx.Scheduler['default'],
currentThreadScheduler = Rx.Scheduler.currentThread,
identity = Rx.helpers.identity,
isScheduler = Rx.Scheduler.isScheduler,
isFunction = Rx.helpers.isFunction,
checkDisposed = Rx.Disposable.checkDisposed;
var errorObj = {e: {}};
function tryCatcherGen(tryCatchTarget) {
return function tryCatcher() {
try {
return tryCatchTarget.apply(this, arguments);
} catch (e) {
errorObj.e = e;
return errorObj;
}
};
}
var tryCatch = Rx.internals.tryCatch = function tryCatch(fn) {
if (!isFunction(fn)) { throw new TypeError('fn must be a function'); }
return tryCatcherGen(fn);
};
function thrower(e) {
throw e;
}
/**
* Used to pause and resume streams.
*/
Rx.Pauser = (function (__super__) {
inherits(Pauser, __super__);
function Pauser() {
__super__.call(this);
}
/**
* Pauses the underlying sequence.
*/
Pauser.prototype.pause = function () { this.onNext(false); };
/**
* Resumes the underlying sequence.
*/
Pauser.prototype.resume = function () { this.onNext(true); };
return Pauser;
}(Subject));
var PausableObservable = (function (__super__) {
inherits(PausableObservable, __super__);
function PausableObservable(source, pauser) {
this.source = source;
this.controller = new Subject();
this.paused = true;
if (pauser && pauser.subscribe) {
this.pauser = this.controller.merge(pauser);
} else {
this.pauser = this.controller;
}
__super__.call(this);
}
PausableObservable.prototype._subscribe = function (o) {
var conn = this.source.publish(),
subscription = conn.subscribe(o),
connection = disposableEmpty;
var pausable = this.pauser.startWith(!this.paused).distinctUntilChanged().subscribe(function (b) {
if (b) {
connection = conn.connect();
} else {
connection.dispose();
connection = disposableEmpty;
}
});
return new NAryDisposable([subscription, connection, pausable]);
};
PausableObservable.prototype.pause = function () {
this.paused = true;
this.controller.onNext(false);
};
PausableObservable.prototype.resume = function () {
this.paused = false;
this.controller.onNext(true);
};
return PausableObservable;
}(Observable));
/**
* Pauses the underlying observable sequence based upon the observable sequence which yields true/false.
* @example
* var pauser = new Rx.Subject();
* var source = Rx.Observable.interval(100).pausable(pauser);
* @param {Observable} pauser The observable sequence used to pause the underlying sequence.
* @returns {Observable} The observable sequence which is paused based upon the pauser.
*/
observableProto.pausable = function (pauser) {
return new PausableObservable(this, pauser);
};
function combineLatestSource(source, subject, resultSelector) {
return new AnonymousObservable(function (o) {
var hasValue = [false, false],
hasValueAll = false,
isDone = false,
values = new Array(2),
err;
function next(x, i) {
values[i] = x;
hasValue[i] = true;
if (hasValueAll || (hasValueAll = hasValue.every(identity))) {
if (err) { return o.onError(err); }
var res = tryCatch(resultSelector).apply(null, values);
if (res === errorObj) { return o.onError(res.e); }
o.onNext(res);
}
isDone && values[1] && o.onCompleted();
}
return new BinaryDisposable(
source.subscribe(
function (x) {
next(x, 0);
},
function (e) {
if (values[1]) {
o.onError(e);
} else {
err = e;
}
},
function () {
isDone = true;
values[1] && o.onCompleted();
}),
subject.subscribe(
function (x) {
next(x, 1);
},
function (e) { o.onError(e); },
function () {
isDone = true;
next(true, 1);
})
);
}, source);
}
var PausableBufferedObservable = (function (__super__) {
inherits(PausableBufferedObservable, __super__);
function PausableBufferedObservable(source, pauser) {
this.source = source;
this.controller = new Subject();
this.paused = true;
if (pauser && pauser.subscribe) {
this.pauser = this.controller.merge(pauser);
} else {
this.pauser = this.controller;
}
__super__.call(this);
}
PausableBufferedObservable.prototype._subscribe = function (o) {
var q = [], previousShouldFire;
function drainQueue() { while (q.length > 0) { o.onNext(q.shift()); } }
var subscription =
combineLatestSource(
this.source,
this.pauser.startWith(!this.paused).distinctUntilChanged(),
function (data, shouldFire) {
return { data: data, shouldFire: shouldFire };
})
.subscribe(
function (results) {
if (previousShouldFire !== undefined && results.shouldFire !== previousShouldFire) {
previousShouldFire = results.shouldFire;
// change in shouldFire
if (results.shouldFire) { drainQueue(); }
} else {
previousShouldFire = results.shouldFire;
// new data
if (results.shouldFire) {
o.onNext(results.data);
} else {
q.push(results.data);
}
}
},
function (err) {
drainQueue();
o.onError(err);
},
function () {
drainQueue();
o.onCompleted();
}
);
return subscription;
};
PausableBufferedObservable.prototype.pause = function () {
this.paused = true;
this.controller.onNext(false);
};
PausableBufferedObservable.prototype.resume = function () {
this.paused = false;
this.controller.onNext(true);
};
return PausableBufferedObservable;
}(Observable));
/**
* Pauses the underlying observable sequence based upon the observable sequence which yields true/false,
* and yields the values that were buffered while paused.
* @example
* var pauser = new Rx.Subject();
* var source = Rx.Observable.interval(100).pausableBuffered(pauser);
* @param {Observable} pauser The observable sequence used to pause the underlying sequence.
* @returns {Observable} The observable sequence which is paused based upon the pauser.
*/
observableProto.pausableBuffered = function (pauser) {
return new PausableBufferedObservable(this, pauser);
};
var ControlledObservable = (function (__super__) {
inherits(ControlledObservable, __super__);
function ControlledObservable (source, enableQueue, scheduler) {
__super__.call(this);
this.subject = new ControlledSubject(enableQueue, scheduler);
this.source = source.multicast(this.subject).refCount();
}
ControlledObservable.prototype._subscribe = function (o) {
return this.source.subscribe(o);
};
ControlledObservable.prototype.request = function (numberOfItems) {
return this.subject.request(numberOfItems == null ? -1 : numberOfItems);
};
return ControlledObservable;
}(Observable));
var ControlledSubject = (function (__super__) {
inherits(ControlledSubject, __super__);
function ControlledSubject(enableQueue, scheduler) {
enableQueue == null && (enableQueue = true);
__super__.call(this);
this.subject = new Subject();
this.enableQueue = enableQueue;
this.queue = enableQueue ? [] : null;
this.requestedCount = 0;
this.requestedDisposable = null;
this.error = null;
this.hasFailed = false;
this.hasCompleted = false;
this.scheduler = scheduler || currentThreadScheduler;
}
addProperties(ControlledSubject.prototype, Observer, {
_subscribe: function (o) {
return this.subject.subscribe(o);
},
onCompleted: function () {
this.hasCompleted = true;
if (!this.enableQueue || this.queue.length === 0) {
this.subject.onCompleted();
this.disposeCurrentRequest();
} else {
this.queue.push(Notification.createOnCompleted());
}
},
onError: function (error) {
this.hasFailed = true;
this.error = error;
if (!this.enableQueue || this.queue.length === 0) {
this.subject.onError(error);
this.disposeCurrentRequest();
} else {
this.queue.push(Notification.createOnError(error));
}
},
onNext: function (value) {
if (this.requestedCount <= 0) {
this.enableQueue && this.queue.push(Notification.createOnNext(value));
} else {
(this.requestedCount-- === 0) && this.disposeCurrentRequest();
this.subject.onNext(value);
}
},
_processRequest: function (numberOfItems) {
if (this.enableQueue) {
while (this.queue.length > 0 && (numberOfItems > 0 || this.queue[0].kind !== 'N')) {
var first = this.queue.shift();
first.accept(this.subject);
if (first.kind === 'N') {
numberOfItems--;
} else {
this.disposeCurrentRequest();
this.queue = [];
}
}
}
return numberOfItems;
},
request: function (number) {
this.disposeCurrentRequest();
var self = this;
this.requestedDisposable = this.scheduler.schedule(number,
function(s, i) {
var remaining = self._processRequest(i);
var stopped = self.hasCompleted || self.hasFailed;
if (!stopped && remaining > 0) {
self.requestedCount = remaining;
return disposableCreate(function () {
self.requestedCount = 0;
});
// Scheduled item is still in progress. Return a new
// disposable to allow the request to be interrupted
// via dispose.
}
});
return this.requestedDisposable;
},
disposeCurrentRequest: function () {
if (this.requestedDisposable) {
this.requestedDisposable.dispose();
this.requestedDisposable = null;
}
}
});
return ControlledSubject;
}(Observable));
/**
* Attaches a controller to the observable sequence with the ability to queue.
* @example
* var source = Rx.Observable.interval(100).controlled();
* source.request(3); // Reads 3 values
* @param {bool} enableQueue truthy value to determine if values should be queued pending the next request
* @param {Scheduler} scheduler determines how the requests will be scheduled
* @returns {Observable} The observable sequence which only propagates values on request.
*/
observableProto.controlled = function (enableQueue, scheduler) {
if (enableQueue && isScheduler(enableQueue)) {
scheduler = enableQueue;
enableQueue = true;
}
if (enableQueue == null) { enableQueue = true; }
return new ControlledObservable(this, enableQueue, scheduler);
};
var StopAndWaitObservable = (function (__super__) {
inherits(StopAndWaitObservable, __super__);
function StopAndWaitObservable (source) {
__super__.call(this);
this.source = source;
}
function scheduleMethod(s, self) {
return self.source.request(1);
}
StopAndWaitObservable.prototype._subscribe = function (o) {
this.subscription = this.source.subscribe(new StopAndWaitObserver(o, this, this.subscription));
return new BinaryDisposable(
this.subscription,
defaultScheduler.schedule(this, scheduleMethod)
);
};
var StopAndWaitObserver = (function (__sub__) {
inherits(StopAndWaitObserver, __sub__);
function StopAndWaitObserver (observer, observable, cancel) {
__sub__.call(this);
this.observer = observer;
this.observable = observable;
this.cancel = cancel;
this.scheduleDisposable = null;
}
StopAndWaitObserver.prototype.completed = function () {
this.observer.onCompleted();
this.dispose();
};
StopAndWaitObserver.prototype.error = function (error) {
this.observer.onError(error);
this.dispose();
};
function innerScheduleMethod(s, self) {
return self.observable.source.request(1);
}
StopAndWaitObserver.prototype.next = function (value) {
this.observer.onNext(value);
this.scheduleDisposable = defaultScheduler.schedule(this, innerScheduleMethod);
};
StopAndWaitObserver.dispose = function () {
this.observer = null;
if (this.cancel) {
this.cancel.dispose();
this.cancel = null;
}
if (this.scheduleDisposable) {
this.scheduleDisposable.dispose();
this.scheduleDisposable = null;
}
__sub__.prototype.dispose.call(this);
};
return StopAndWaitObserver;
}(AbstractObserver));
return StopAndWaitObservable;
}(Observable));
/**
* Attaches a stop and wait observable to the current observable.
* @returns {Observable} A stop and wait observable.
*/
ControlledObservable.prototype.stopAndWait = function () {
return new StopAndWaitObservable(this);
};
var WindowedObservable = (function (__super__) {
inherits(WindowedObservable, __super__);
function WindowedObservable(source, windowSize) {
__super__.call(this);
this.source = source;
this.windowSize = windowSize;
}
function scheduleMethod(s, self) {
return self.source.request(self.windowSize);
}
WindowedObservable.prototype._subscribe = function (o) {
this.subscription = this.source.subscribe(new WindowedObserver(o, this, this.subscription));
return new BinaryDisposable(
this.subscription,
defaultScheduler.schedule(this, scheduleMethod)
);
};
var WindowedObserver = (function (__sub__) {
inherits(WindowedObserver, __sub__);
function WindowedObserver(observer, observable, cancel) {
this.observer = observer;
this.observable = observable;
this.cancel = cancel;
this.received = 0;
this.scheduleDisposable = null;
__sub__.call(this);
}
WindowedObserver.prototype.completed = function () {
this.observer.onCompleted();
this.dispose();
};
WindowedObserver.prototype.error = function (error) {
this.observer.onError(error);
this.dispose();
};
function innerScheduleMethod(s, self) {
return self.observable.source.request(self.observable.windowSize);
}
WindowedObserver.prototype.next = function (value) {
this.observer.onNext(value);
this.received = ++this.received % this.observable.windowSize;
this.received === 0 && (this.scheduleDisposable = defaultScheduler.schedule(this, innerScheduleMethod));
};
WindowedObserver.prototype.dispose = function () {
this.observer = null;
if (this.cancel) {
this.cancel.dispose();
this.cancel = null;
}
if (this.scheduleDisposable) {
this.scheduleDisposable.dispose();
this.scheduleDisposable = null;
}
__sub__.prototype.dispose.call(this);
};
return WindowedObserver;
}(AbstractObserver));
return WindowedObservable;
}(Observable));
/**
* Creates a sliding windowed observable based upon the window size.
* @param {Number} windowSize The number of items in the window
* @returns {Observable} A windowed observable based upon the window size.
*/
ControlledObservable.prototype.windowed = function (windowSize) {
return new WindowedObservable(this, windowSize);
};
/**
* Pipes the existing Observable sequence into a Node.js Stream.
* @param {Stream} dest The destination Node.js stream.
* @returns {Stream} The destination stream.
*/
observableProto.pipe = function (dest) {
var source = this.pausableBuffered();
function onDrain() {
source.resume();
}
dest.addListener('drain', onDrain);
source.subscribe(
function (x) {
!dest.write(x) && source.pause();
},
function (err) {
dest.emit('error', err);
},
function () {
// Hack check because STDIO is not closable
!dest._isStdio && dest.end();
dest.removeListener('drain', onDrain);
});
source.resume();
return dest;
};
return Rx;
}));