AbstractDelegationTokenSecretManager (Hadoop 0.20.2+737 API)
Date: 2010-10-11

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## org.apache.hadoop.security.token.delegation
Class AbstractDelegationTokenSecretManager<TokenIdent extends AbstractDelegationTokenIdentifier>

    java.lang.Object
      org.apache.hadoop.security.token.SecretManager<TokenIdent>
          org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager<TokenIdent>

Direct Known Subclasses:
  DelegationTokenSecretManager

    public abstract class AbstractDelegationTokenSecretManager<TokenIdent extends AbstractDelegationTokenIdentifier>

extends SecretManager<TokenIdent>

Nested Class Summary
`static class` | `AbstractDelegationTokenSecretManager.DelegationTokenInformation` Class to encapsulate a token's renew date and password.

Nested classes/interfaces inherited from class org.apache.hadoop.security.token.SecretManager
`SecretManager.InvalidToken`

Field Summary
`protected Map<Integer,DelegationKey>` | `allKeys` Access to allKeys is protected by this object lock
`protected int` | `currentId` Access to currentId is protected by this object lock.
`protected Map<TokenIdent,AbstractDelegationTokenSecretManager.DelegationTokenInformation>` | `currentTokens` Cache of currently valid tokens, mapping from DelegationTokenIdentifier to DelegationTokenInformation.
`protected int` | `delegationTokenSequenceNumber` Sequence number to create DelegationTokenIdentifier.
`protected boolean` | `running`

Constructor Summary
`AbstractDelegationTokenSecretManager(long delegationKeyUpdateInterval, long delegationTokenMaxLifetime, long delegationTokenRenewInterval, long delegationTokenRemoverScanInterval)`

Method Summary
`void` | `addKey(DelegationKey key)` Add a previously used master key to cache (when NN restarts), should be called before activate().
`TokenIdent` | `cancelToken(Token<TokenIdent> token, String canceller)` Cancel a token by removing it from cache.
`protected byte[]` | `createPassword(TokenIdent identifier)` Create the password for the given identifier.
`static SecretKey` | `createSecretKey(byte[] key)` Convert the byte[] to a secret key
`DelegationKey[]` | `getAllKeys()`
`boolean` | `isRunning()` is secretMgr running
`protected void` | `logUpdateMasterKey(DelegationKey key)`
`long` | `renewToken(Token<TokenIdent> token, String renewer)` Renew a delegation token.
`byte[]` | `retrievePassword(TokenIdent identifier)` Retrieve the password for the given token identifier.
`void` | `startThreads()` should be called before this object is used
`void` | `stopThreads()`

Methods inherited from class org.apache.hadoop.security.token.SecretManager
`createIdentifier, createPassword, generateSecret`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### currentTokens

    protected final Map<TokenIdent extends AbstractDelegationTokenIdentifier,AbstractDelegationTokenSecretManager.DelegationTokenInformation> currentTokens

  Cache of currently valid tokens, mapping from DelegationTokenIdentifier to DelegationTokenInformation. Protected by this object lock.

### delegationTokenSequenceNumber

    protected int delegationTokenSequenceNumber

  Sequence number to create DelegationTokenIdentifier. Protected by this object lock.

### allKeys

    protected final Map<Integer,DelegationKey> allKeys

  Access to allKeys is protected by this object lock

### currentId

    protected int currentId

  Access to currentId is protected by this object lock.

### running

    protected volatile boolean running

Constructor Detail

### AbstractDelegationTokenSecretManager

    public AbstractDelegationTokenSecretManager(long delegationKeyUpdateInterval,
                                                long delegationTokenMaxLifetime,
                                                long delegationTokenRenewInterval,
                                                long delegationTokenRemoverScanInterval)

Method Detail

### startThreads

    public void startThreads()
                      throws IOException

  should be called before this object is used

  Throws:
    `IOException`

### isRunning

    public boolean isRunning()

  is secretMgr running

  Returns:
    true if secret mgr is running

### addKey

    public void addKey(DelegationKey key)
                throws IOException

  Add a previously used master key to cache (when NN restarts), should be called before activate().

  Throws:
    `IOException`

### getAllKeys

    public DelegationKey[] getAllKeys()

### logUpdateMasterKey

    protected void logUpdateMasterKey(DelegationKey key)
                               throws IOException

  Throws:
    `IOException`

### createPassword

    protected byte[] createPassword(TokenIdent identifier)

  Description copied from class: `SecretManager`
  Create the password for the given identifier. identifier may be modified inside this method.

  Specified by:
    `createPassword` in class `SecretManager<TokenIdent extends AbstractDelegationTokenIdentifier>`
  Parameters:
    `identifier` - the identifier to use
  Returns:
    the new password

### retrievePassword

    public byte[] retrievePassword(TokenIdent identifier)
                            throws SecretManager.InvalidToken

  Description copied from class: `SecretManager`
  Retrieve the password for the given token identifier. Should check the date or registry to make sure the token hasn't expired or been revoked. Returns the relevant password.

  Specified by:
    `retrievePassword` in class `SecretManager<TokenIdent extends AbstractDelegationTokenIdentifier>`
  Parameters:
    `identifier` - the identifier to validate
  Returns:
    the password to use
  Throws:
    `SecretManager.InvalidToken` - the token was invalid

### renewToken

    public long renewToken(Token<TokenIdent> token,
                           String renewer)
                    throws SecretManager.InvalidToken,
                           IOException

  Renew a delegation token.

  Parameters:
    `token` - the token to renew
    `renewer` - the full principal name of the user doing the renewal
  Returns:
    the new expiration time
  Throws:
    `InvalidToken` - if the token is invalid
    `AccessControlException` - if the user can't renew token
    `SecretManager.InvalidToken`
    `IOException`

### cancelToken

    public TokenIdent cancelToken(Token<TokenIdent> token,
                                  String canceller)
                                                                     throws IOException

  Cancel a token by removing it from cache.

  Returns:
    Identifier of the canceled token
  Throws:
    `InvalidToken` - for invalid token
    `AccessControlException` - if the user isn't allowed to cancel
    `IOException`

### createSecretKey

    public static SecretKey createSecretKey(byte[] key)

  Convert the byte[] to a secret key

  Parameters:
    `key` - the byte[] to create the secret key from
  Returns:
    the secret key

### stopThreads

    public void stopThreads()

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