Example usage for org.apache.hadoop.security.token TokenIdentifier readFields

Introduction

In this page you can find the example usage for org.apache.hadoop.security.token TokenIdentifier readFields.

Prototype

void readFields(DataInput in) throws IOException;

Source Link

Document

Deserialize the fields of this object from in.

Usage

From source file:org.apache.giraph.comm.netty.handler.SaslServerHandler.java

License:Apache License

/**
 * Get the token identifier object, or null if it could not be constructed
 * (because the class could not be loaded, for example).
 * Hadoop 2.0.0 (and older Hadoop2 versions? (verify)) need this.
 * Hadoop 2.0.1 and newer have a Token.decodeIdentifier() method and do not
 * need this. Might want to create a munge flag to distinguish 2.0.0 vs newer.
 *
 * @param token the token to decode into a TokenIdentifier
 * @param cls the subclass of TokenIdentifier to decode the token into.
 * @return the token identifier./*www  .j a  v  a  2 s  . c  o  m*/
 * @throws IOException
 */
@SuppressWarnings("unchecked")
private TokenIdentifier decodeIdentifier(Token<? extends TokenIdentifier> token,
        Class<? extends TokenIdentifier> cls) throws IOException {
    TokenIdentifier tokenIdentifier = ReflectionUtils.newInstance(cls, null);
    ByteArrayInputStream buf = new ByteArrayInputStream(token.getIdentifier());
    DataInputStream in = new DataInputStream(buf);
    tokenIdentifier.readFields(in);
    in.close();
    return tokenIdentifier;
}

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