/**
 * Proxy which uses HTML5 session storage as its data storage/retrieval mechanism. If this proxy
 * is used in a browser where session storage is not supported, the constructor will throw an error.
 * A session storage proxy requires a unique ID which is used as a key in which all record data
 * are stored in the session storage object.
 *
 * It's important to supply this unique ID as it cannot be reliably determined otherwise. If no id
 * is provided but the attached store has a storeId, the storeId will be used. If neither option
 * is presented the proxy will throw an error.
 *
 * Proxies are almost always used with a {@link Ext.data.Store store}:
 *
 *     new Ext.data.Store({
 *         proxy: {
 *             type: 'sessionstorage',
 *             id: 'myProxyKey'
 *         }
 *     });
 *
 * Alternatively you can instantiate the Proxy directly:
 *
 *     new Ext.data.proxy.SessionStorage({
 *         id: 'myOtherProxyKey'
 *     });
 *
 * Note that session storage is different to local storage (see
 * {@link Ext.data.proxy.LocalStorage}) - if a browser session is ended (e.g. by closing
 * the browser) then all data in a SessionStorageProxy are lost. Browser restarts
 * don't affect the {@link Ext.data.proxy.LocalStorage} - the data are preserved.
 */
Ext.define('Ext.data.proxy.SessionStorage', {
    extend: 'Ext.data.proxy.WebStorage',
    alias: 'proxy.sessionstorage',
    alternateClassName: 'Ext.data.SessionStorageProxy',

    getStorageObject: function() {
        return window.sessionStorage;
    }
});