aaac7fed
 liuqimichale
add
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"use strict";
module.exports = function(Promise, PromiseArray, apiRejection, debug) {
var util = require("./util");
var tryCatch = util.tryCatch;
var errorObj = util.errorObj;
var async = Promise._async;
Promise.prototype["break"] = Promise.prototype.cancel = function() {
if (!debug.cancellation()) return this._warn("cancellation is disabled");
var promise = this;
var child = promise;
while (promise._isCancellable()) {
if (!promise._cancelBy(child)) {
if (child._isFollowing()) {
child._followee().cancel();
} else {
child._cancelBranched();
}
break;
}
var parent = promise._cancellationParent;
if (parent == null || !parent._isCancellable()) {
if (promise._isFollowing()) {
promise._followee().cancel();
} else {
promise._cancelBranched();
}
break;
} else {
if (promise._isFollowing()) promise._followee().cancel();
promise._setWillBeCancelled();
child = promise;
promise = parent;
}
}
};
Promise.prototype._branchHasCancelled = function() {
this._branchesRemainingToCancel--;
};
Promise.prototype._enoughBranchesHaveCancelled = function() {
return this._branchesRemainingToCancel === undefined ||
this._branchesRemainingToCancel <= 0;
};
Promise.prototype._cancelBy = function(canceller) {
if (canceller === this) {
this._branchesRemainingToCancel = 0;
this._invokeOnCancel();
return true;
} else {
this._branchHasCancelled();
if (this._enoughBranchesHaveCancelled()) {
this._invokeOnCancel();
return true;
}
}
return false;
};
Promise.prototype._cancelBranched = function() {
if (this._enoughBranchesHaveCancelled()) {
this._cancel();
}
};
Promise.prototype._cancel = function() {
if (!this._isCancellable()) return;
this._setCancelled();
async.invoke(this._cancelPromises, this, undefined);
};
Promise.prototype._cancelPromises = function() {
if (this._length() > 0) this._settlePromises();
};
Promise.prototype._unsetOnCancel = function() {
this._onCancelField = undefined;
};
Promise.prototype._isCancellable = function() {
return this.isPending() && !this._isCancelled();
};
Promise.prototype.isCancellable = function() {
return this.isPending() && !this.isCancelled();
};
Promise.prototype._doInvokeOnCancel = function(onCancelCallback, internalOnly) {
if (util.isArray(onCancelCallback)) {
for (var i = 0; i < onCancelCallback.length; ++i) {
this._doInvokeOnCancel(onCancelCallback[i], internalOnly);
}
} else if (onCancelCallback !== undefined) {
if (typeof onCancelCallback === "function") {
if (!internalOnly) {
var e = tryCatch(onCancelCallback).call(this._boundValue());
if (e === errorObj) {
this._attachExtraTrace(e.e);
async.throwLater(e.e);
}
}
} else {
onCancelCallback._resultCancelled(this);
}
}
};
Promise.prototype._invokeOnCancel = function() {
var onCancelCallback = this._onCancel();
this._unsetOnCancel();
async.invoke(this._doInvokeOnCancel, this, onCancelCallback);
};
Promise.prototype._invokeInternalOnCancel = function() {
if (this._isCancellable()) {
this._doInvokeOnCancel(this._onCancel(), true);
this._unsetOnCancel();
}
};
Promise.prototype._resultCancelled = function() {
this.cancel();
};
};
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