// Copyright 2005 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Implements the disposable interface. The dispose method is used
* to clean up references and resources.
* @author [email protected] (Erik Arvidsson)
*/
goog.provide('goog.Disposable');
/** @suppress {extraProvide} */
goog.provide('goog.dispose');
/** @suppress {extraProvide} */
goog.provide('goog.disposeAll');
goog.require('goog.disposable.IDisposable');
/**
* Class that provides the basic implementation for disposable objects. If your
* class holds one or more references to COM objects, DOM nodes, or other
* disposable objects, it should extend this class or implement the disposable
* interface (defined in goog.disposable.IDisposable).
* @constructor
* @implements {goog.disposable.IDisposable}
*/
goog.Disposable = function() {
if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {
if (goog.Disposable.INCLUDE_STACK_ON_CREATION) {
this.creationStack = new Error().stack;
}
goog.Disposable.instances_[goog.getUid(this)] = this;
}
// Support sealing
this.disposed_ = this.disposed_;
this.onDisposeCallbacks_ = this.onDisposeCallbacks_;
};
/**
* @enum {number} Different monitoring modes for Disposable.
*/
goog.Disposable.MonitoringMode = {
/**
* No monitoring.
*/
OFF: 0,
/**
* Creating and disposing the goog.Disposable instances is monitored. All
* disposable objects need to call the {@code goog.Disposable} base
* constructor. The PERMANENT mode must be switched on before creating any
* goog.Disposable instances.
*/
PERMANENT: 1,
/**
* INTERACTIVE mode can be switched on and off on the fly without producing
* errors. It also doesn't warn if the disposable objects don't call the
* {@code goog.Disposable} base constructor.
*/
INTERACTIVE: 2
};
/**
* @define {number} The monitoring mode of the goog.Disposable
* instances. Default is OFF. Switching on the monitoring is only
* recommended for debugging because it has a significant impact on
* performance and memory usage. If switched off, the monitoring code
* compiles down to 0 bytes.
*/
goog.define('goog.Disposable.MONITORING_MODE', 0);
/**
* @define {boolean} Whether to attach creation stack to each created disposable
* instance; This is only relevant for when MonitoringMode != OFF.
*/
goog.define('goog.Disposable.INCLUDE_STACK_ON_CREATION', true);
/**
* Maps the unique ID of every undisposed {@code goog.Disposable} object to
* the object itself.
* @type {!Object<number, !goog.Disposable>}
* @private
*/
goog.Disposable.instances_ = {};
/**
* @return {!Array<!goog.Disposable>} All {@code goog.Disposable} objects that
* haven't been disposed of.
*/
goog.Disposable.getUndisposedObjects = function() {
var ret = [];
for (var id in goog.Disposable.instances_) {
if (goog.Disposable.instances_.hasOwnProperty(id)) {
ret.push(goog.Disposable.instances_[Number(id)]);
}
}
return ret;
};
/**
* Clears the registry of undisposed objects but doesn't dispose of them.
*/
goog.Disposable.clearUndisposedObjects = function() {
goog.Disposable.instances_ = {};
};
/**
* Whether the object has been disposed of.
* @type {boolean}
* @private
*/
goog.Disposable.prototype.disposed_ = false;
/**
* Callbacks to invoke when this object is disposed.
* @type {Array<!Function>}
* @private
*/
goog.Disposable.prototype.onDisposeCallbacks_;
/**
* If monitoring the goog.Disposable instances is enabled, stores the creation
* stack trace of the Disposable instance.
* @const {string}
*/
goog.Disposable.prototype.creationStack;
/**
* @return {boolean} Whether the object has been disposed of.
* @override
*/
goog.Disposable.prototype.isDisposed = function() {
return this.disposed_;
};
/**
* @return {boolean} Whether the object has been disposed of.
* @deprecated Use {@link #isDisposed} instead.
*/
goog.Disposable.prototype.getDisposed = goog.Disposable.prototype.isDisposed;
/**
* Disposes of the object. If the object hasn't already been disposed of, calls
* {@link #disposeInternal}. Classes that extend {@code goog.Disposable} should
* override {@link #disposeInternal} in order to delete references to COM
* objects, DOM nodes, and other disposable objects. Reentrant.
*
* @return {void} Nothing.
* @override
*/
goog.Disposable.prototype.dispose = function() {
if (!this.disposed_) {
// Set disposed_ to true first, in case during the chain of disposal this
// gets disposed recursively.
this.disposed_ = true;
this.disposeInternal();
if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {
var uid = goog.getUid(this);
if (goog.Disposable.MONITORING_MODE ==
goog.Disposable.MonitoringMode.PERMANENT &&
!goog.Disposable.instances_.hasOwnProperty(uid)) {
throw Error(this + ' did not call the goog.Disposable base ' +
'constructor or was disposed of after a clearUndisposedObjects ' +
'call');
}
delete goog.Disposable.instances_[uid];
}
}
};
/**
* Associates a disposable object with this object so that they will be disposed
* together.
* @param {goog.disposable.IDisposable} disposable that will be disposed when
* this object is disposed.
*/
goog.Disposable.prototype.registerDisposable = function(disposable) {
this.addOnDisposeCallback(goog.partial(goog.dispose, disposable));
};
/**
* Invokes a callback function when this object is disposed. Callbacks are
* invoked in the order in which they were added. If a callback is added to
* an already disposed Disposable, it will be called immediately.
* @param {function(this:T):?} callback The callback function.
* @param {T=} opt_scope An optional scope to call the callback in.
* @template T
*/
goog.Disposable.prototype.addOnDisposeCallback = function(callback, opt_scope) {
if (this.disposed_) {
callback.call(opt_scope);
return;
}
if (!this.onDisposeCallbacks_) {
this.onDisposeCallbacks_ = [];
}
this.onDisposeCallbacks_.push(
goog.isDef(opt_scope) ? goog.bind(callback, opt_scope) : callback);
};
/**
* Deletes or nulls out any references to COM objects, DOM nodes, or other
* disposable objects. Classes that extend {@code goog.Disposable} should
* override this method.
* Not reentrant. To avoid calling it twice, it must only be called from the
* subclass' {@code disposeInternal} method. Everywhere else the public
* {@code dispose} method must be used.
* For example:
* <pre>
* mypackage.MyClass = function() {
* mypackage.MyClass.base(this, 'constructor');
* // Constructor logic specific to MyClass.
* ...
* };
* goog.inherits(mypackage.MyClass, goog.Disposable);
*
* mypackage.MyClass.prototype.disposeInternal = function() {
* // Dispose logic specific to MyClass.
* ...
* // Call superclass's disposeInternal at the end of the subclass's, like
* // in C++, to avoid hard-to-catch issues.
* mypackage.MyClass.base(this, 'disposeInternal');
* };
* </pre>
* @protected
*/
goog.Disposable.prototype.disposeInternal = function() {
if (this.onDisposeCallbacks_) {
while (this.onDisposeCallbacks_.length) {
this.onDisposeCallbacks_.shift()();
}
}
};
/**
* Returns True if we can verify the object is disposed.
* Calls {@code isDisposed} on the argument if it supports it. If obj
* is not an object with an isDisposed() method, return false.
* @param {*} obj The object to investigate.
* @return {boolean} True if we can verify the object is disposed.
*/
goog.Disposable.isDisposed = function(obj) {
if (obj && typeof obj.isDisposed == 'function') {
return obj.isDisposed();
}
return false;
};
/**
* Calls {@code dispose} on the argument if it supports it. If obj is not an
* object with a dispose() method, this is a no-op.
* @param {*} obj The object to dispose of.
*/
goog.dispose = function(obj) {
if (obj && typeof obj.dispose == 'function') {
obj.dispose();
}
};
/**
* Calls {@code dispose} on each member of the list that supports it. (If the
* member is an ArrayLike, then {@code goog.disposeAll()} will be called
* recursively on each of its members.) If the member is not an object with a
* {@code dispose()} method, then it is ignored.
* @param {...*} var_args The list.
*/
goog.disposeAll = function(var_args) {
for (var i = 0, len = arguments.length; i < len; ++i) {
var disposable = arguments[i];
if (goog.isArrayLike(disposable)) {
goog.disposeAll.apply(null, disposable);
} else {
goog.dispose(disposable);
}
}
};
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