gecko/netwerk/test/TestCachePerformance.js

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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.");
}