CODEWITHSUNDEEP
java
kenyu73
kenyu73

Reputation: 681

Getting general data throughput in socket streams

I'm just looking for a rough estimate of data in and out of my socket server. I figured using serialize would be the trick since I can count the bytes of an object. I know there's Instrumentation but don't want to use that. Why is int coming back at 81?!?! Its supposed to be 4 bytes.

I'm no expert on the guts of serialize beside some basics, but I didn't expect 81!

int x = 1;
long test1 = Tools.serialize("1").length; // returns 8
long test2 = Tools.serialize(x).length; // returns 81 ???

private static byte[] serialize(Object obj) throws IOException {
    ByteArrayOutputStream b = new ByteArrayOutputStream();
    ObjectOutputStream o = new ObjectOutputStream(b);
    o.writeObject(obj);
    return b.toByteArray();
}

Upvotes: 1

Views: 38

Answers (2)

Sleiman Jneidi
Sleiman Jneidi

Reputation: 23319

When you call serialize(x), x will be boxed to an Integer object then writeObject will serialize the entire Integer object and not the just the value its int value.

You have to do special treatment for ever type 

o.writeInt(x);
o.writeLong(x); etc...

this could be as simple as that

if(obj.getClass().equals(Integer.class)){
    Integer i = (Integer) obj;
    o.writeInt(i.intValue());
}
else if(obj.getClass().equals(Long.class)){
   Long l = (Long) obj;
   o.writeLong(l.longValue());
}....
else {
   o.writeObject(obj);
}

There are loads of libraries that do serialisation stuff with backward and forward compatibilities, pick one

Upvotes: 1

Sam
Sam

Reputation: 2970

Because you are passing it as an object not as a primitive data type, you should actually use o.writeInt(val)

    ByteArrayOutputStream b = new ByteArrayOutputStream();
    ObjectOutputStream o = new ObjectOutputStream(b);
    o.writeInt(1);
    System.out.println(b.toByteArray().length); //4

So what you should do is to write multiple methods for it like

serialize(int num){...}
serialize(Object obj){...}

also this might be interesting http://www.javaworld.com/article/2072752/the-java-serialization-algorithm-revealed.html

Upvotes: 1

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