private void initSystemCredentials() {
   NodeHeartbeatResponseProtoOrBuilder p = viaProto ? proto : builder;
   List<SystemCredentialsForAppsProto> list = p.getSystemCredentialsForAppsList();
   this.systemCredentials = new HashMap<ApplicationId, ByteBuffer>();
   for (SystemCredentialsForAppsProto c : list) {
     ApplicationId appId = convertFromProtoFormat(c.getAppId());
     ByteBuffer byteBuffer = ProtoUtils.convertFromProtoFormat(c.getCredentialsForApp());
     this.systemCredentials.put(appId, byteBuffer);
   }
 }
 private ExecutionType convertFromProtoFormat(ExecutionTypeProto executionType) {
   return ProtoUtils.convertFromProtoFormat(executionType);
 }
 private ContainerType convertFromProtoFormat(ContainerTypeProto containerType) {
   return ProtoUtils.convertFromProtoFormat(containerType);
 }