TODO for ClassGraph-5.x

[lukehutch]

• Split code into separate libraries (retaining ScanResult for lifetime of application #667):
  • classgraph-classpath:
    • Walks the stack to find classloaders
    • Obtains classpath elements from classloaders using reflection, producing a list of paths
    • Enumerates all resources in all classpath elements
  • classgraph-vfs:
    • Fast multithreaded zipfile parser
    • Move all work queue and singleton map code to this project
    • Closes resources if they are unused for a specified number of seconds; re-opens resources as needed.
    • Still need to implement Closeable interface, since shutdown hooks and finalizers are so broken
  • classgraph-scanner:
    • Scans classfiles found in a resource list to produce ClassInfo objects etc.
    • Remove custom JSON serialization from ScanResult. People can use Jackson if they need to.
• Remove classloading code (ClassInfo#loadClass(), AnnotationInfo#loadClassAndInstantiate(), etc.)
  • Classloading should be the user's responsibility, not ClassGraph's responsibility -- classloading has resulted in too many weird bugs to do with classes being loaded into the wrong classloader
  • Also by removing all classloading support, a ScanResult no longer needs to keep resources open
    • However, ScanResult should not contain references to Resource objects anymore -- there should be a separate scanning process for resources and classes.
• Remove JDK 7 support? Replace inner classes with lambdas
• Remove deprecated APIs
• See bugs asking for behavioral changes (External classes are included by default in upwards scan #463, Looking up annotations (also) reports annotations of annotations #559)