datastore
Version:
> [Brick](http://github.com/bredele/brickjs) reactive data layer
401 lines (336 loc) • 22.7 kB
JavaScript
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.datastore = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/**
* Dependencies.
*/
var promise = require('bluff')
var delegate = require('./lib/adapter')
var Emitter = require('emitter-component')
/**
* Expose `datastore`
*
* @param {Object?} data
* @param {Function?} adapter
* @api public
*/
module.exports = function(data, adapter) {
data = data || {}
/**
* A datastore is an event emitter.
*/
var store = new Emitter()
/**
* Delegate operations to the datastore adapter.
* (Fallback in memory)
*/
var proxy = delegate(store, data, adapter)
/**
* Get value associated to a key (synchronous version)
*
* @param {Any} key
* @return value associated to the key, or undefined if there is none
* @api public
*/
store.get = function(key) {
return data[key]
}
/**
* Get value associated to a key (asynchronous version)
*
* @param {Any} key
* @return value associated to the key, or undefined if there is none
* @api public
*/
store.pull = function(key) {
return promise(function(resolve) {
proxy('pull', resolve, key)
})
}
/**
* Sets the value for the key in the datastore.
*
* @param {Any} key
* @param {Any} value
* @return {Promise}
* @api public
*/
store.set = function(key, value) {
var prev = data[key]
var cb = function(val) {
return promise(function(resolve) {
proxy('set', function(key, entry) {
resolve(entry)
store.emit('changed ' + key, value, prev)
store.emit('changed', key, value, prev)
}, key, val)
})
}
return value == null ? cb : cb(value)
}
/**
* Removes any value associated to the key.
*
* @param {Any} key
* @api public
*/
store.del = function(key) {
var prev = data[key]
return promise(function(resolve) {
proxy('del', function(entry) {
resolve(entry)
store.emit('deleted ' + key, prev)
store.emit('deleted', key, prev)
}, key)
})
}
return store
}
},{"./lib/adapter":2,"bluff":4,"emitter-component":5}],2:[function(require,module,exports){
/**
* Dependencies.
*/
var memory = require('./memory')
/**
* Delegate datastore methods to a proxy object (adapter)
*
* All methods (set, pull, del, etc) have a fallback in memory.
*
* @param {Object} store
* @param {Object} data
* @param {Function} adapter
* @return {Function}
* @api private
*/
module.exports = function(store, data, adapter) {
var fallback = memory.call(store, data)
adapter = adapter ? adapter.call(store, data) : {}
return function(method, cb, key, value) {
(adapter[method] || function(target, key, value) {
target(key, value)
})(function(key, value) {
fallback[method](cb, key, value)
}, key, value)
}
}
},{"./memory":3}],3:[function(require,module,exports){
/**
* In memory adapter.
*
* A datastore always save its keys into memory.
*
* @param {Object} data
* @return {Object} proxy
* @api private
*/
module.exports = function(data) {
return {
set: function(target, key, value) {
data[key] = typeof value == 'function' ? value.call(data) : value
target(key, value)
},
del: function(target, key) {
delete data[key]
target(key)
},
pull: function(target, key) {
target(data[key])
}
}
}
},{}],4:[function(require,module,exports){
/**
* Promise A+ implementation.
*
* @param {Function} resolver
* @return thenable
* @api public
*/
module.exports = function promise(resolver) {
var state = 'pending'
var result
var fulfilled = []
var rejected = []
resolver(function(value) {
state = 'fulfilled'
result = value
fulfilled.map(function(cb) {
cb(result)
})
}, function(reason) {
state = 'rejected'
result = reason
rejected.map(function(cb) {
cb(result)
})
})
return {
then: function(fulfill, reject) {
if(typeof fulfill != 'function') fulfill = function(value) {
return value
}
if(typeof reject != 'function') reject = function(reason) {
return reason
}
return promise(function(success, error) {
if(state == 'pending') {
fulfilled.push(function(value) {
try {
success(fulfill(value))
} catch(e) {
error(e)
}
})
rejected.push(function(reason) {
try {
error(reject(reason))
} catch(e) {
error(e)
}
})
} else if(state == 'fulfilled') success(fulfill(result))
else error(reject(result))
})
}
}
}
},{}],5:[function(require,module,exports){
/**
* Expose `Emitter`.
*/
module.exports = Emitter;
/**
* Initialize a new `Emitter`.
*
* @api public
*/
function Emitter(obj) {
if (obj) return mixin(obj);
};
/**
* Mixin the emitter properties.
*
* @param {Object} obj
* @return {Object}
* @api private
*/
function mixin(obj) {
for (var key in Emitter.prototype) {
obj[key] = Emitter.prototype[key];
}
return obj;
}
/**
* Listen on the given `event` with `fn`.
*
* @param {String} event
* @param {Function} fn
* @return {Emitter}
* @api public
*/
Emitter.prototype.on =
Emitter.prototype.addEventListener = function(event, fn){
this._callbacks = this._callbacks || {};
(this._callbacks[event] = this._callbacks[event] || [])
.push(fn);
return this;
};
/**
* Adds an `event` listener that will be invoked a single
* time then automatically removed.
*
* @param {String} event
* @param {Function} fn
* @return {Emitter}
* @api public
*/
Emitter.prototype.once = function(event, fn){
var self = this;
this._callbacks = this._callbacks || {};
function on() {
self.off(event, on);
fn.apply(this, arguments);
}
on.fn = fn;
this.on(event, on);
return this;
};
/**
* Remove the given callback for `event` or all
* registered callbacks.
*
* @param {String} event
* @param {Function} fn
* @return {Emitter}
* @api public
*/
Emitter.prototype.off =
Emitter.prototype.removeListener =
Emitter.prototype.removeAllListeners =
Emitter.prototype.removeEventListener = function(event, fn){
this._callbacks = this._callbacks || {};
// all
if (0 == arguments.length) {
this._callbacks = {};
return this;
}
// specific event
var callbacks = this._callbacks[event];
if (!callbacks) return this;
// remove all handlers
if (1 == arguments.length) {
delete this._callbacks[event];
return this;
}
// remove specific handler
var cb;
for (var i = 0; i < callbacks.length; i++) {
cb = callbacks[i];
if (cb === fn || cb.fn === fn) {
callbacks.splice(i, 1);
break;
}
}
return this;
};
/**
* Emit `event` with the given args.
*
* @param {String} event
* @param {Mixed} ...
* @return {Emitter}
*/
Emitter.prototype.emit = function(event){
this._callbacks = this._callbacks || {};
var args = [].slice.call(arguments, 1)
, callbacks = this._callbacks[event];
if (callbacks) {
callbacks = callbacks.slice(0);
for (var i = 0, len = callbacks.length; i < len; ++i) {
callbacks[i].apply(this, args);
}
}
return this;
};
/**
* Return array of callbacks for `event`.
*
* @param {String} event
* @return {Array}
* @api public
*/
Emitter.prototype.listeners = function(event){
this._callbacks = this._callbacks || {};
return this._callbacks[event] || [];
};
/**
* Check if this emitter has `event` handlers.
*
* @param {String} event
* @return {Boolean}
* @api public
*/
Emitter.prototype.hasListeners = function(event){
return !! this.listeners(event).length;
};
},{}]},{},[1])(1)
});
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cb : cb(value)\n  }\n\n\n  /**\n   * Removes any value associated to the key.\n   *\n   * @param {Any} key\n   * @api public\n   */\n\n  store.del = function(key) {\n    var prev = data[key]\n    return promise(function(resolve) {\n      proxy('del', function(entry) {\n        resolve(entry)\n        store.emit('deleted ' + key, prev)\n        store.emit('deleted', key, prev)\n      }, key)\n    })\n  }\n\n  return store\n}\n","/**\n * Dependencies.\n */\n\nvar memory = require('./memory')\n\n\n/**\n * Delegate datastore methods to a proxy object (adapter)\n *\n * All methods (set, pull, del, etc) have a fallback in memory.\n *\n * @param {Object} store\n * @param {Object} data\n * @param {Function} adapter\n * @return {Function}\n * @api private\n */\n\nmodule.exports = function(store, data, adapter) {\n  var fallback = memory.call(store, data)\n  adapter = adapter ? adapter.call(store, data) : {}\n  return function(method, cb, key, value) {\n    (adapter[method] || function(target, key, value) {\n      target(key, value)\n    })(function(key, value) {\n      fallback[method](cb, key, value)\n    }, key, value)\n  }\n}\n","\n/**\n * In memory adapter.\n *\n * A datastore always save its keys into memory.\n *\n * @param {Object} data\n * @return {Object} proxy\n * @api private\n */\n\nmodule.exports = function(data) {\n  return {\n    set: function(target, key, value) {\n      data[key] = typeof value == 'function' ? value.call(data) : value\n      target(key, value)\n    },\n\n    del: function(target, key) {\n      delete data[key]\n      target(key)\n    },\n\n    pull: function(target, key) {\n      target(data[key])\n    }\n  }\n}\n","\n/**\n * Promise A+ implementation.\n *\n * @param {Function} resolver\n * @return thenable\n * @api public\n */\n\nmodule.exports = function promise(resolver) {\n  var state = 'pending'\n  var result\n  var fulfilled = []\n  var rejected = []\n  resolver(function(value) {\n    state = 'fulfilled'\n    result = value\n    fulfilled.map(function(cb) {\n      cb(result)\n    })\n  }, function(reason) {\n    state = 'rejected'\n    result = reason\n    rejected.map(function(cb) {\n      cb(result)\n    })\n  })\n  return {\n    then: function(fulfill, reject) {\n      if(typeof fulfill != 'function') fulfill = function(value) {\n        return value\n      }\n      if(typeof reject != 'function') reject = function(reason) {\n        return reason\n      }\n      return promise(function(success, error) {\n        if(state == 'pending') {\n          fulfilled.push(function(value) {\n            try {\n              success(fulfill(value))\n            } catch(e) {\n              error(e)\n            }\n          })\n          rejected.push(function(reason) {\n            try {\n              error(reject(reason))\n            } catch(e) {\n              error(e)\n            }\n          })\n        } else if(state == 'fulfilled') success(fulfill(result))\n        else error(reject(result))\n      })\n    }\n  }\n}\n","\n/**\n * Expose `Emitter`.\n */\n\nmodule.exports = Emitter;\n\n/**\n * Initialize a new `Emitter`.\n *\n * @api public\n */\n\nfunction Emitter(obj) {\n  if (obj) return mixin(obj);\n};\n\n/**\n * Mixin the emitter properties.\n *\n * @param {Object} obj\n * @return {Object}\n * @api private\n */\n\nfunction mixin(obj) {\n  for (var key in Emitter.prototype) {\n    obj[key] = Emitter.prototype[key];\n  }\n  return obj;\n}\n\n/**\n * Listen on the given `event` with `fn`.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.on =\nEmitter.prototype.addEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n  (this._callbacks[event] = this._callbacks[event] || [])\n    .push(fn);\n  return this;\n};\n\n/**\n * Adds an `event` listener that will be invoked a single\n * time then automatically removed.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.once = function(event, fn){\n  var self = this;\n  this._callbacks = this._callbacks || {};\n\n  function on() {\n    self.off(event, on);\n    fn.apply(this, arguments);\n  }\n\n  on.fn = fn;\n  this.on(event, on);\n  return this;\n};\n\n/**\n * Remove the given callback for `event` or all\n * registered callbacks.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.off =\nEmitter.prototype.removeListener =\nEmitter.prototype.removeAllListeners =\nEmitter.prototype.removeEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n\n  // all\n  if (0 == arguments.length) {\n    this._callbacks = {};\n    return this;\n  }\n\n  // specific event\n  var callbacks = this._callbacks[event];\n  if (!callbacks) return this;\n\n  // remove all handlers\n  if (1 == arguments.length) {\n    delete this._callbacks[event];\n    return this;\n  }\n\n  // remove specific handler\n  var cb;\n  for (var i = 0; i < callbacks.length; i++) {\n    cb = callbacks[i];\n    if (cb === fn || cb.fn === fn) {\n      callbacks.splice(i, 1);\n      break;\n    }\n  }\n  return this;\n};\n\n/**\n * Emit `event` with the given args.\n *\n * @param {String} event\n * @param {Mixed} ...\n * @return {Emitter}\n */\n\nEmitter.prototype.emit = function(event){\n  this._callbacks = this._callbacks || {};\n  var args = [].slice.call(arguments, 1)\n    , callbacks = this._callbacks[event];\n\n  if (callbacks) {\n    callbacks = callbacks.slice(0);\n    for (var i = 0, len = callbacks.length; i < len; ++i) {\n      callbacks[i].apply(this, args);\n    }\n  }\n\n  return this;\n};\n\n/**\n * Return array of callbacks for `event`.\n *\n * @param {String} event\n * @return {Array}\n * @api public\n */\n\nEmitter.prototype.listeners = function(event){\n  this._callbacks = this._callbacks || {};\n  return this._callbacks[event] || [];\n};\n\n/**\n * Check if this emitter has `event` handlers.\n *\n * @param {String} event\n * @return {Boolean}\n * @api public\n */\n\nEmitter.prototype.hasListeners = function(event){\n  return !! this.listeners(event).length;\n};\n"]}