private Map<String, ClassFileTransformer> newRegistry(List<MatchableClassFileTransformer> matchableClassFileTransformerList) {
        final Map<String, ClassFileTransformer> registry = new HashMap<String, ClassFileTransformer>(512);
        for (MatchableClassFileTransformer transformer : matchableClassFileTransformerList) {
            try {
                addTransformer(registry, transformer.getMatcher(), transformer);
            } catch (Exception ex) {
                if (logger.isWarnEnabled()) {
                    logger.warn("Failed to add transformer {}", transformer, ex);
                }
            }
        }
        return registry;
    }
@author emeroad
@author netspider
@author hyungil.jeong
@author Minwoo Jung
@author jaehong.kim
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/instrument/transformer/DefaultTransformerRegistry.java