package test;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
/**
* Micro-benchmark for comparing performance of bean deserialization
*/
public final class TestJvmDeserPerf
{
/*
/**********************************************************
/* Actual test
/**********************************************************
*/
private final int REPS;
private TestJvmDeserPerf() {
// Let's try to guestimate suitable size
REPS = 35000;
}
private MediaItem buildItem()
{
MediaItem.Content content = new MediaItem.Content();
content.setPlayer(MediaItem.Content.Player.JAVA);
content.setUri("http://javaone.com/keynote.mpg");
content.setTitle("Javaone Keynote");
content.setWidth(640);
content.setHeight(480);
content.setFormat("video/mpeg4");
content.setDuration(18000000L);
content.setSize(58982400L);
content.setBitrate(262144);
content.setCopyright("None");
content.addPerson("Bill Gates");
content.addPerson("Steve Jobs");
MediaItem item = new MediaItem(content);
item.addPhoto(new MediaItem.Photo("http://javaone.com/keynote_large.jpg", "Javaone Keynote", 1024, 768, MediaItem.Photo.Size.LARGE));
item.addPhoto(new MediaItem.Photo("http://javaone.com/keynote_small.jpg", "Javaone Keynote", 320, 240, MediaItem.Photo.Size.SMALL));
return item;
}
public void test()
throws Exception
{
int sum = 0;
final MediaItem item = buildItem();
JsonFactory jsonF =
// new org.codehaus.jackson.smile.SmileFactory();
new JsonFactory()
;
final ObjectMapper jsonMapper = new ObjectMapper(jsonF);
jsonMapper.registerModule(new com.fasterxml.jackson.module.afterburner.AfterburnerModule());
byte[] json = jsonMapper.writeValueAsBytes(item);
System.out.println("Warmed up: data size is "+json.length+" bytes; "+REPS+" reps -> "
+((REPS * json.length) >> 10)+" kB per iteration");
System.out.println();
int round = 0;
while (true) {
// try { Thread.sleep(100L); } catch (InterruptedException ie) { }
// round = (round + 1) % 2;
long curr = System.currentTimeMillis();
String msg;
boolean lf = (round == 0);
switch (round) {
case 0:
msg = "Deserialize/databind, JSON";
sum += testDeser(jsonMapper, json, REPS);
break;
case 1:
msg = "Deserialize/manual, JSON";
sum += testDeser(jsonMapper.getJsonFactory(), json, REPS);
break;
default:
throw new Error("Internal error");
}
curr = System.currentTimeMillis() - curr;
if (lf) {
System.out.println();
}
System.out.println("Test '"+msg+"' -> "+curr+" msecs ("
+(sum & 0xFF)+").");
}
}
protected int testDeser(ObjectMapper mapper, byte[] input, int reps)
throws Exception
{
JavaType type = TypeFactory.defaultInstance().constructType(MediaItem.class);
MediaItem item = null;
for (int i = 0; i < reps; ++i) {
item = mapper.readValue(input, 0, input.length, type);
}
return item.hashCode(); // just to get some non-optimizable number
}
protected int testDeser(JsonFactory jf, byte[] input, int reps)
throws Exception
{
MediaItem item = null;
for (int i = 0; i < reps; ++i) {
JsonParser jp = jf.createJsonParser(input);
item = MediaItem.deserialize(jp);
jp.close();
}
return item.hashCode(); // just to get some non-optimizable number
}
public static void main(String[] args) throws Exception
{
new TestJvmDeserPerf().test();
}
}