> As John Rose has pointed out in this issue, the current j.l.r.Proxy based > implementation of MethodHandleProxies.asInterface has a few issues: > 1. Exposes too much information via Proxy supertype (and WrapperInstance > interface) > 2. Does not allow future expansion to support SAM[^1] abstract classes > 3. Slow (in fact, very slow) > > This patch addresses all 3 problems: > 1. It implements proxies with one hidden class for each requested interface > and replaced WrapperInstance inheritance with a check to the class data. This > can avoid unexpected passing of `instanceof`, and avoids the nasty problem of > exporting a JDK interface to a dynamic module to ensure access. > 2. This patch obtains already generated classes from a ClassValue by the > requested interface type; the ClassValue can later be updated to compute > implementation generation for abstract classes as well. > 3. This patch's generated hidden classes has call performance on par with > those of lambda expressions; the creation performance is slightly less than > that of LambdaMetafactory: > https://jmh.morethan.io/?gist=fcb946d83ee4ac7386901795ca49b224 > > Additionally, an obsolete `ProxyForMethodHandle` test was removed, for it's > no longer applicable. Tests in `jdk/java/lang/invoke` and > `jdk/java/lang/reflect` pass. > > [^1]: single abstract method
Chen Liang has updated the pull request incrementally with one additional commit since the last revision: Minor cleanup, attempt to migrate lookup validation blocked by security manager ------------- Changes: - all: https://git.openjdk.org/jdk/pull/13197/files - new: https://git.openjdk.org/jdk/pull/13197/files/f5d0ef0a..27dc803d Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=13197&range=11 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13197&range=10-11 Stats: 17 lines in 3 files changed: 5 ins; 4 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/13197.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13197/head:pull/13197 PR: https://git.openjdk.org/jdk/pull/13197
