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[Time API] Updated documentation for Time API

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Henry 2017-04-29 16:01:20 -07:00
parent 52b6815687
commit 6628f93823
1 changed files with 132 additions and 26 deletions
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158
src/api/time/TimeAPI.js
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@ -25,15 +25,21 @@ define(['EventEmitter'], function (EventEmitter) {
var tick;
/**
* The public API for setting and querying time conductor state. The
* time conductor is the means by which the temporal bounds of a view
* are controlled. Time-sensitive views will typically respond to
* changes to bounds or other properties of the time conductor and
* update the data displayed based on the time conductor state.
* The public API for setting and querying the temporal state of the
* application. The concept of time is integral to Open MCT, and at least
* one {@link TimeSystem}, as well as some default time bounds must be
* registered and enabled via {@link TimeAPI.addTimeSystem} and
* {@link TimeAPI.timeSystem} respectively for Open MCT to work.
*
* Time-sensitive views will typically respond to changes to bounds or other
* properties of the time conductor and update the data displayed based on
* the temporal state of the application. The current time bounds are also
* used in queries for historical data.
*
* The TimeAPI extends the EventEmitter class. A number of events are
* fired when properties of the time conductor change, which are documented
* below.
*
* The TimeConductor extends the EventEmitter class. A number of events are
* fired when properties of the time conductor change, which are
* documented below.
* @interface
* @memberof module:openmct
*/
@ -56,9 +62,8 @@ define(['EventEmitter'], function (EventEmitter) {
this.offsets = undefined;
/**
* Tick is not exposed via public API, even @privately to avoid misuse.
* Tick is private to avoid misuse.
*/
tick = function (timestamp) {
var newBounds = {
start: timestamp + this.offsets.start,
@ -79,26 +84,84 @@ define(['EventEmitter'], function (EventEmitter) {
TimeAPI.prototype = Object.create(EventEmitter.prototype);
/**
* A TimeSystem provides meaning to the values returned by the TimeAPI. Open
* MCT supports multiple different types of time values, although all are
* intrinsically represented by numbers, the meaning of those numbers can
* differ depending on context.
*
* A default time system is provided by Open MCT in the form of the {@link UTCTimeSystem},
* which represents integer values as ms in the Unix epoch. An example of
* another time system might be "sols" for a Martian mission. TimeSystems do
* not address the issue of converting between time systems.
*
* @typedef {object} TimeSystem
* @property {string} key A unique identifier
* @property {string} name A human-readable descriptor
* @property {string} [cssClass] Specify a css class defining an icon for
* this time system. This will be visible next to the time system in the
* menu in the Time Conductor
* @property {string} timeFormat The key of a format to use when displaying
* discrete timestamps from this time system
* @property {string} [durationFormat] The key of a format to use when
* displaying a duration or relative span of time in this time system.
*/
/**
* Register a new time system. Once registered it can activated using
* {@link TimeAPI.timeSystem}, and can be referenced via its key in [Time Conductor configuration](@link https://github.com/nasa/openmct/blob/master/API.md#time-conductor).
* @memberof module:openmct.TimeAPI#
* @param {TimeSystem} timeSystem A time system object.
*/
TimeAPI.prototype.addTimeSystem = function (timeSystem) {
this.timeSystems.set(timeSystem.key, timeSystem);
};
/**
* @returns {TimeSystem[]}
*/
TimeAPI.prototype.getAllTimeSystems = function () {
return Array.from(this.timeSystems.values());
};
/**
* Clocks provide a timing source that is used to
* automatically update the time bounds of the data displayed in Open MCT.
*
* @typedef {object} Clock
* @memberof openmct.timeAPI
* @property {string} key A unique identifier
* @property {string} name A human-readable name. The name will be used to
* represent this clock in the Time Conductor UI
* @property {string} description A longer description, ideally identifying
* what the clock ticks on.
* @property {function} currentValue Returns the last value generated by a tick, or a default value
* if no ticking has yet occurred
* @see {LocalClock}
*/
/**
* Register a new Clock.
* @memberof module:openmct.TimeAPI#
* @param {Clock} clock
*/
TimeAPI.prototype.addClock = function (clock) {
this.clocks.set(clock.key, clock);
};
/**
* @memberof module:openmct.TimeAPI#
* @returns {Clock[]}
* @memberof module:openmct.TimeAPI#
*/
TimeAPI.prototype.getAllClocks = function () {
return Array.from(this.clocks.values());
};
/**
* Validate the given bounds. This can be used for pre-validation of
* bounds, for example by views validating user inputs.
* @param bounds The start and end time of the conductor.
* Validate the given bounds. This can be used for pre-validation of bounds,
* for example by views validating user inputs.
* @param {TimeBounds} bounds The start and end time of the conductor.
* @returns {string | true} A validation error, or true if valid
* @memberof module:openmct.TimeAPI#
* @method validateBounds
@ -118,8 +181,8 @@ define(['EventEmitter'], function (EventEmitter) {
/**
* Validate the given offsets. This can be used for pre-validation of
* offsetse, for example by views validating user inputs.
* @param offsets The start and end offsets from a 'now' value.
* offsets, for example by views validating user inputs.
* @param {ClockOffsets} offsets The start and end offsets from a 'now' value.
* @returns {string | true} A validation error, or true if valid
* @memberof module:openmct.TimeAPI#
* @method validateBounds
@ -140,9 +203,11 @@ define(['EventEmitter'], function (EventEmitter) {
};
/**
* @typedef {Object} TimeConductorBounds
* @property {number} start The start time displayed by the time conductor in ms since epoch. Epoch determined by current time system
* @property {number} end The end time displayed by the time conductor in ms since epoch.
* @typedef {Object} TimeBounds
* @property {number} start The start time displayed by the time conductor
* in ms since epoch. Epoch determined by currently active time system
* @property {number} end The end time displayed by the time conductor in ms
* since epoch.
* @memberof module:openmct.TimeAPI~
*/
@ -186,9 +251,7 @@ define(['EventEmitter'], function (EventEmitter) {
};
/**
* Get or set the time system of the TimeAPI. Time systems determine
* units, epoch, and other aspects of time representation. When changing
* the time system in use, new valid bounds must also be provided.
* Get or set the time system of the TimeAPI.
* @param {TimeSystem | string} timeSystem
* @param {module:openmct.TimeAPI~TimeConductorBounds} bounds
* @fires module:openmct.TimeAPI~timeSystem
@ -242,10 +305,11 @@ define(['EventEmitter'], function (EventEmitter) {
};
/**
* Get or set the Time of Interest. The Time of Interest is the temporal
* focus of the current view. It can be manipulated by the user from the
* time conductor or from other views.The time of interest can
* effectively be unset by assigning a value of 'undefined'.
* Get or set the Time of Interest. The Time of Interest is a single point
* in time, and constitutes the temporal focus of application views. It can
* be manipulated by the user from the time conductor or from other views.
* The time of interest can effectively be unset by assigning a value of
* 'undefined'.
* @fires module:openmct.TimeAPI~timeOfInterest
* @param newTOI
* @returns {number} the current time of interest
@ -268,11 +332,14 @@ define(['EventEmitter'], function (EventEmitter) {
/**
* Set the active clock. Tick source will be immediately subscribed to
* and ticking will begin. Offsets from 'now' must also be provided.
* and ticking will begin. Offsets from 'now' must also be provided. A clock
* can be unset by calling {@link stopClock}.
*
* @param {Clock || string} The clock to activate, or its key
* @param {ClockOffsets} offsets on each tick these will be used to calculate
* the start and end bounds. This maintains a sliding time window of a fixed
* width that automatically updates.
* @fires module:openmct.TimeAPI~clock
* @return {Clock} the currently active clock;
*/
TimeAPI.prototype.clock = function (keyOrClock, offsets) {
@ -303,6 +370,13 @@ define(['EventEmitter'], function (EventEmitter) {
this.activeClock.on("tick", tick);
}
/**
* The active clock has changed. Clock can be unset by calling {@link stopClock}
* @event clock
* @memberof module:openmct.TimeAPI~
* @property {Clock} clock The newly activated clock, or undefined
* if the system is no longer following a clock source
*/
this.emit("clock", this.activeClock);
} else if (arguments.length === 1){
@ -312,6 +386,26 @@ define(['EventEmitter'], function (EventEmitter) {
return this.activeClock;
};
/**
* Clock offsets are used to calculate temporal bounds when the system is
* ticking on a clock source.
*
* @typedef {object} ClockOffsets
* @property {number} start A time span relative to the current value of the
* ticking clock, from which start bounds will be calculated. This value must
* be < 0. When a clock is active, bounds will be calculated automatically
* based on the value provided by the clock, and the defined clock offsets.
* @property {number} end A time span relative to the current value of the
* ticking clock, from which end bounds will be calculated. This value must
* be >= 0.
*/
/**
* Get or set the currently applied clock offsets. If no parameter is provided,
* the current value will be returned. If provided, the new value will be
* used as the new clock offsets.
* @param {ClockOffsets} offsets
* @returns {ClockOffsets}
*/
TimeAPI.prototype.clockOffsets = function (offsets) {
if (arguments.length > 0) {
@ -330,11 +424,23 @@ define(['EventEmitter'], function (EventEmitter) {
this.bounds(newBounds);
/**
* Event that is triggered when clock offsets change.
* @event clockOffsets
* @memberof module:openmct.TimeAPI~
* @property {ClockOffsets} clockOffsets The newly activated clock
* offsets.
*/
this.emit("clockOffsets", offsets);
}
return this.offsets;
};
/**
* Stop the currently active clock from ticking, and unset it. This will
* revert all views to showing a static time frame defined by the current
* bounds.
*/
TimeAPI.prototype.stopClock = function () {
if (this.activeClock) {
this.clock(undefined, undefined);