1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 /** 6 * Requests the database from the backend. 7 */ 8 function requestResourcePrefetchPredictorDb() { 9 chrome.send('requestResourcePrefetchPredictorDb'); 10 } 11 12 /** 13 * Callback from backend with the database contents. Sets up some globals and 14 * calls to create the UI. 15 * @param {Dictionary} database Information about ResourcePrefetchPredictor 16 * including the database as a flattened list, a boolean indicating if the 17 * system is enabled. 18 */ 19 function updateResourcePrefetchPredictorDb(database) { 20 updateResourcePrefetchPredictorDbView(database); 21 } 22 23 /** 24 * Truncates the string to keep the database readable. 25 * @param {string} str The string to truncate. 26 * @return {string} The truncated string. 27 */ 28 function truncateString(str) { 29 return str.length < 100 ? str : str.substring(0, 99); 30 } 31 32 /** 33 * Updates the table from the database. 34 * @param {Dictionary} database Information about ResourcePrefetchPredictor 35 * including the database as a flattened list, a boolean indicating if the 36 * system is enabled and the current hit weight. 37 */ 38 function updateResourcePrefetchPredictorDbView(database) { 39 if (!database.enabled) { 40 $('rpp_enabled').style.display = 'none'; 41 $('rpp_disabled').style.display = 'block'; 42 return; 43 } else { 44 $('rpp_enabled').style.display = 'block'; 45 $('rpp_disabled').style.display = 'none'; 46 } 47 48 var hasUrlData = database.url_db && database.url_db.length > 0; 49 var hasHostData = database.host_db && database.host_db.length > 0; 50 51 if (hasUrlData) 52 renderCacheData($('rpp_url_body'), database.url_db); 53 if (hasHostData) 54 renderCacheData($('rpp_host_body'), database.host_db); 55 } 56 57 /** 58 * Renders cache data for URL or host based data. 59 * @param {HTMLElement} body element of table to render into. 60 * @param {Dictionary} database to render. 61 */ 62 function renderCacheData(body, database) { 63 body.textContent = ''; 64 for (var i = 0; i < database.length; ++i) { 65 var main = database[i]; 66 67 for (var j = 0; j < main.resources.length; ++j) { 68 var resource = main.resources[j]; 69 var row = document.createElement('tr'); 70 71 if (j == 0) { 72 var t = document.createElement('td'); 73 t.rowSpan = main.resources.length; 74 t.textContent = truncateString(main.main_frame_url); 75 t.className = 'last'; 76 row.appendChild(t); 77 } 78 79 if (j == main.resources.length - 1) 80 row.className = 'last'; 81 82 row.appendChild(document.createElement('td')).textContent = 83 truncateString(resource.resource_url); 84 row.appendChild(document.createElement('td')).textContent = 85 resource.resource_type; 86 row.appendChild(document.createElement('td')).textContent = 87 resource.number_of_hits; 88 row.appendChild(document.createElement('td')).textContent = 89 resource.number_of_misses; 90 row.appendChild(document.createElement('td')).textContent = 91 resource.consecutive_misses; 92 row.appendChild(document.createElement('td')).textContent = 93 resource.position; 94 row.appendChild(document.createElement('td')).textContent = 95 resource.score; 96 body.appendChild(row); 97 } 98 } 99 } 100 101 document.addEventListener('DOMContentLoaded', 102 requestResourcePrefetchPredictorDb); 103
