@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("Cache\n");
        sb.append("builtin defs: ").append(builtinConfigDefinitions.getConfigDefinitions().size()).append("\n");
        sb.append("user defs:    ").append(userConfigDefinitions.getConfigDefinitions().size()).append("\n");
        sb.append("md5sums:      ").append(checksums.size()).append("\n");
        sb.append("md5ToConfig:  ").append(checksumToConfig.size()).append("\n");

        return sb.toString();
    }
Cache that holds configs and config definitions (builtin and user config definitions).

@author vegardh
configserver/src/main/java/com/yahoo/vespa/config/server/ServerCache.java