water

Class Weaver

java.lang.Object

water.Weaver

public class Weaver
extends java.lang.Object

Class to auto-gen serializer delegate classes.

Constructor Summary

Constructors

Constructor and Description
Weaver()

Method Summary

Modifier and Type	Method and Description
static <T extends Freezable> Icer<T>	genDelegate(int id, java.lang.Class<T> clazz)
static java.lang.reflect.Field[]	getWovenFields(java.lang.Class clz) Get all woven fields in this class, including subclasses, up to the normal Iced serialization classes, skipping static and transient fields, and the required _ice_id field.
static void	loadDynamic(java.lang.String name, byte[] b) Load/Reload classes defined at runtime.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Weaver

public Weaver()

Method Detail

getWovenFields

public static java.lang.reflect.Field[] getWovenFields(java.lang.Class clz)

Get all woven fields in this class, including subclasses, up to the normal Iced serialization classes, skipping static and transient fields, and the required _ice_id field.

Returns:

Array of Field holding the list of woven fields.

genDelegate

public static <T extends Freezable> Icer<T> genDelegate(int id,
                                                        java.lang.Class<T> clazz)

loadDynamic

public static void loadDynamic(java.lang.String name,
                               byte[] b)

Load/Reload classes defined at runtime. Loading classes at runtime is a matter of simply injecting the new code into the ClassPool, and then javassistLoadClass(int, Class) resolves the generation of (de)serializers. In order to reload classes, though, each dynamically loaded class must have its very own ClassLoader, and all previous Icers must be removed. In order to maintain cluster-wide coherency about which classes are loaded, the TypeMap is likewise updated whenever a class is reloaded. In order to successfully load classes at runtime (for example a subclass of MRTask), each node takes the bytecode and class name and puts a new ByteArrayClassPath onto _pool's classpath. Since there is no mechanism for retrieving these ClassPath instances later, they are stored in CLASSPATHS so that reload events can remove the old paths. Similarly, CLASSLOADERS holds on to the loaders of dynamically created classes so that classes can be reloaded and old ClassLoader instances pruned. Finally, in order to genDelegate(int, Class) during a class reload, then the previous Icer must be CtClass.detach()ed. In addition, the TypeMap.goForGold(int) must turn a null for the Icer.

Parameters:

name - class name

b - bytecode