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public class DelegationTokenClient  {

    public TokenDetails generateToken(List<String> renewers, long maxLifeTime);

    public boolean renewToken(bytes[] hmac,  long expiryTimerenewPeriod);

    public boolean expireToken(bytes[] hmac, long expireTimeStamp);

    public boolean invalidateToken(bytes[] hmac);
 
    public List<TokenDetails> describeTokens();

    public void close();

}