From 6cee49a8a110d291bc8949ffb58bb9df16504b81 Mon Sep 17 00:00:00 2001 From: shahan Date: Tue, 30 Jan 2018 13:22:40 -0800 Subject: Adds CodecScanner to help automate building a codec registry. Scan takes 1-2s. PiperOrigin-RevId: 183881368 --- .../lib/skyframe/serialization/CodecScanner.java | 42 ++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 src/main/java/com/google/devtools/build/lib/skyframe/serialization/CodecScanner.java (limited to 'src') diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/serialization/CodecScanner.java b/src/main/java/com/google/devtools/build/lib/skyframe/serialization/CodecScanner.java new file mode 100644 index 0000000000..7536c6df1b --- /dev/null +++ b/src/main/java/com/google/devtools/build/lib/skyframe/serialization/CodecScanner.java @@ -0,0 +1,42 @@ +// Copyright 2018 The Bazel Authors. All rights reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package com.google.devtools.build.lib.skyframe.serialization; + +import com.google.common.reflect.ClassPath; +import com.google.common.reflect.ClassPath.ClassInfo; +import java.io.IOException; +import java.util.stream.Stream; + +/** Scans the classpath to find codec instances. */ +public class CodecScanner { + + /** + * Returns a stream of likely codec implementations. + * + *

Caller should do additional checks as this method only performs string matching. + * + * @param packagePrefix emits only classes in packages having this prefix + */ + public static Stream> scanCodecs(String packagePrefix) throws IOException { + return ClassPath.from(ClassLoader.getSystemClassLoader()) + .getResources() + .stream() + .filter(r -> r instanceof ClassInfo) + .map(r -> (ClassInfo) r) + .filter(c -> c.getPackageName().startsWith(packagePrefix)) + .filter(c -> c.getSimpleName().endsWith("Codec")) + .map(c -> c.load()); + } +} -- cgit v1.2.3