var DEBUG = true; var clientID = "javascript"; var nsICache = Components.interfaces.nsICache; function getCacheService() { var nsCacheService = Components.classes["@mozilla.org/network/cache-service;1"]; var service = nsCacheService.getService(Components.interfaces.nsICacheService); return service; } function createCacheSession(clientID, storagePolicy, streamable) { var service = getCacheService(); var session = service.createSession(clientID, storagePolicy, streamable); return session; } function openCacheEntry(url, mode) { var session = createCacheSession(clientID, nsICache.STORE_ON_DISK, true); var entry = session.openCacheEntry(url, mode); return entry; } function wrapInputStream(input) { var nsIScriptableInputStream = Components.interfaces.nsIScriptableInputStream; var factory = Components.classes["@mozilla.org/scriptableinputstream;1"]; var wrapper = factory.createInstance(nsIScriptableInputStream); wrapper.init(input); return wrapper; } function getIOService() { var CID = Components.classes["@mozilla.org/network/io-service;1"]; var service = CID.getService(Components.interfaces.nsIIOService); return service; } function downloadHTTP(spec) { var ioService = getIOService(); var uri = ioService.newURI(spec, null, null); var channel = ioService.newChannelFromURI(uri); var input = wrapInputStream(channel.open()); var data = input.read(input.available()); input.close(); return data; } function download(url) { var data = ""; var buffer = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 65536); var stream = url.getContent(); while (true) { var count = stream.read(buffer); if (count <= 0) break; var str = new java.lang.String(buffer, 0, count); data += str; } stream.close(); return data; } function write(url, data) { var key = url.toString(); var outputEntry = openCacheEntry(key, nsICache.ACCESS_WRITE); var output = outputEntry.transport.openOutputStream(0, -1, 0); var count = output.write(data, data.length); // store some metadata. outputEntry.setMetaDataElement("size", data.length); output.close(); outputEntry.markValid(); outputEntry.close(); return count; } function read(url) { var key = url.toString(); var inputEntry = openCacheEntry(key, nsICache.ACCESS_READ); var input = wrapInputStream(inputEntry.transport.openInputStream(0, -1, 0)); var data = input.read(input.available()); input.close(); inputEntry.close(); return data; } function readMetaData(url, element) { var key = url.toString(); var inputEntry = openCacheEntry(key, nsICache.ACCESS_READ); var metadata = inputEntry.getMetaDataElement(element); inputEntry.close(); return metadata; } function doom(url) { var key = url.toString(); var doomedEntry = openCacheEntry(key, nsICache.ACCESS_READ_WRITE); doomedEntry.doom(); doomedEntry.close(); } function test() { // download some real content from the network. var url = new java.net.URL("http://www.mozilla.org"); var key = url.toString(); var data = download(url); if (write(url, data) == data.length) print("disk cache write works!"); else print("disk cache write broken!"); if (read(url) == data) print("disk cache read works!"); else print("disk cache read broken!"); if (readMetaData(url, "size") == data.length) print("disk cache metadata works!"); else print("disk cache metadata broken!"); } function median(array) { var cmp = function(x, y) { return x - y; } array.sort(cmp); var middle = Math.floor(array.length / 2); return array[middle]; } function sum(array) { var s = 0; var len = array.length; for (var i = 0; i < len; ++i) s += array[i]; return s; } function time() { var N = 50; var System = java.lang.System; var url = new java.net.URL("http://www.mozilla.org"); var downloadTimes = new Array(); for (var i = 0; i < N; ++i) { var begin = System.currentTimeMillis(); download(url); var end = System.currentTimeMillis(); downloadTimes.push(end - begin); } var downloadTotal = sum(downloadTimes); var downloadMean = downloadTotal / N; var downloadMedian = median(downloadTimes); print("" + N + " downloads took " + downloadTotal + " milliseconds."); print("mean = " + downloadMean + " milliseconds."); print("median = " + downloadMedian + " milliseconds."); var readTimes = new Array(); for (var i = 0; i < N; ++i) { var begin = System.currentTimeMillis(); read(url); var end = System.currentTimeMillis(); readTimes.push(end - begin); } var readTotal = sum(readTimes); var readMean = readTotal / N; var readMedian = median(readTimes); print("" + N + " reads took " + readTotal + " milliseconds."); print("mean = " + readMean + " milliseconds."); print("median = " + readMedian + " milliseconds."); } // load the cache service before doing anything with Java... getCacheService(); if (DEBUG) { print("cache service loaded."); } else { print("running disk cache test."); test(); print("disk cache test complete."); }