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130 lines
3.6 KiB
130 lines
3.6 KiB
"use strict";
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module.exports = function(Promise, PromiseArray, apiRejection, debug) {
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var util = require("./util");
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var tryCatch = util.tryCatch;
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var errorObj = util.errorObj;
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var async = Promise._async;
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Promise.prototype["break"] = Promise.prototype.cancel = function() {
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if (!debug.cancellation()) return this._warn("cancellation is disabled");
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var promise = this;
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var child = promise;
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while (promise._isCancellable()) {
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if (!promise._cancelBy(child)) {
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if (child._isFollowing()) {
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child._followee().cancel();
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} else {
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child._cancelBranched();
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}
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break;
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}
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var parent = promise._cancellationParent;
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if (parent == null || !parent._isCancellable()) {
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if (promise._isFollowing()) {
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promise._followee().cancel();
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} else {
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promise._cancelBranched();
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}
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break;
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} else {
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if (promise._isFollowing()) promise._followee().cancel();
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promise._setWillBeCancelled();
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child = promise;
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promise = parent;
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}
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}
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};
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Promise.prototype._branchHasCancelled = function() {
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this._branchesRemainingToCancel--;
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};
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Promise.prototype._enoughBranchesHaveCancelled = function() {
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return this._branchesRemainingToCancel === undefined ||
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this._branchesRemainingToCancel <= 0;
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};
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Promise.prototype._cancelBy = function(canceller) {
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if (canceller === this) {
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this._branchesRemainingToCancel = 0;
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this._invokeOnCancel();
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return true;
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} else {
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this._branchHasCancelled();
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if (this._enoughBranchesHaveCancelled()) {
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this._invokeOnCancel();
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return true;
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}
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}
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return false;
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};
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Promise.prototype._cancelBranched = function() {
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if (this._enoughBranchesHaveCancelled()) {
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this._cancel();
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}
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};
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Promise.prototype._cancel = function() {
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if (!this._isCancellable()) return;
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this._setCancelled();
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async.invoke(this._cancelPromises, this, undefined);
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};
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Promise.prototype._cancelPromises = function() {
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if (this._length() > 0) this._settlePromises();
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};
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Promise.prototype._unsetOnCancel = function() {
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this._onCancelField = undefined;
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};
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Promise.prototype._isCancellable = function() {
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return this.isPending() && !this._isCancelled();
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};
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Promise.prototype.isCancellable = function() {
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return this.isPending() && !this.isCancelled();
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};
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Promise.prototype._doInvokeOnCancel = function(onCancelCallback, internalOnly) {
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if (util.isArray(onCancelCallback)) {
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for (var i = 0; i < onCancelCallback.length; ++i) {
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this._doInvokeOnCancel(onCancelCallback[i], internalOnly);
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}
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} else if (onCancelCallback !== undefined) {
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if (typeof onCancelCallback === "function") {
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if (!internalOnly) {
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var e = tryCatch(onCancelCallback).call(this._boundValue());
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if (e === errorObj) {
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this._attachExtraTrace(e.e);
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async.throwLater(e.e);
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}
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}
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} else {
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onCancelCallback._resultCancelled(this);
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}
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}
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};
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Promise.prototype._invokeOnCancel = function() {
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var onCancelCallback = this._onCancel();
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this._unsetOnCancel();
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async.invoke(this._doInvokeOnCancel, this, onCancelCallback);
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};
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Promise.prototype._invokeInternalOnCancel = function() {
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if (this._isCancellable()) {
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this._doInvokeOnCancel(this._onCancel(), true);
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this._unsetOnCancel();
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}
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};
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Promise.prototype._resultCancelled = function() {
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this.cancel();
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};
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};
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