[FEATURE] extend any class with `@Graft.*` API
See original GitHub issueExtend existing classes by grafting bytecode from Transplant classes. Transplants are plain java classes; annotations define interactions with the target class.
A custom classloader is responsible for applying the transformations at load-time. The classloader is setup either using a javaagent or prior to referencing any targeted classes.
Sprung from #570, refer to it for the discussion leading up to this.
Use-cases
- Functionality for editors: callbacks and tighter tooling integration
- Additional debugging capabilities: logging, record stack traces, additional callbacks
- Extending existing functionality for final or otherwise non-extendable classes
- The odd bug fix in imported dependencies
Example Transplant for ComponentMapper
@Graft.Target(ComponentMapper.class)
public class ComponentMapperTransplant<A> {
@Graft.Mock // only needed for compilation
private World world;
@Graft.Fuse // inject into original method;
public A create(int entityId) {
LifecyclePlugin.dispatcher.onComponentPreCreate(world, entityId);
A result = create(entityId); // create(entity) refers to original method
LifecyclePlugin.dispatcher.onComponentPostCreate(world, entityId);
return result;
}
}
API
@Graft.Target
specifies which class to transplant to.@Graft.Fuse
transplants bytecode over to@Graft.Target
, translating any references toComponentMapperTransplant
->ComponentMapper
.@Graft.Mock
to keep the compiler happy when you need to reference fields or methods in the target class. Mocked references point to target class after transplant.- Any non-annotated methods or fields are copied over as-is.
Nice to have:
Better to resolve it when applying@Graft.Replace
: Like@Graft.Fuse
but removes the original method.@Graft.Fuse
.@Graft.Remove
: Remove field or method from target class.
Caveats
- You’re working against internal implementation; there are no semver guarantees
- No retrofitting of interfaces or parent type on target class
- Annotations aren’t fused (is there a use-case?)
- No
@Graft.Fuse
for constructors; nice to have, but not initially - No GWT support
- No android support (possible but not planned)
Issue Analytics
- State:
- Created 4 years ago
- Reactions:1
- Comments:9 (6 by maintainers)
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PSA: a lot of stuff at work and outside work for the remainder of the week; prob won’t have time to do any work on it before the weekend
Closing as junkdog/graftt is its own project