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## com.beasys.commerce.util
Class JDBCSequencer

    java.lang.Object
      com.beasys.commerce.util.JDBCSequencer

All Implemented Interfaces
  Sequencer

Deprecated Use `com.bea.p13n.util.jdbc.Sequencer` and `com.bea.p13n.util.jdbc.SequencerFactory`

    @Deprecated
    public class JDBCSequencer

extends Object
implements Sequencer

The JDBCSequencer class is a portable implementation for generating unique sequence numbers. JDBCSequencer uses a caching strategy where a block of sequence numbers is allocated in memory. When the block of sequence numbers is exhausted, JDBCSequencer obtains a new range of sequence numbers from the database. This approach has the advantage of minimizing the database access but it can create sequence numbers to be skipped if the server is restarted.

This implementation uses the WLCS_SEQUENCER table to maintain the current values of the different sequences. Each sequence is represented by a row in the WLCS_SEQUENCER and a row is automatically inserted for a sequence that does not exists already.

When allocating a new block of sequence numbers, JDBCSequencer uses a retry loop for obtaining an application lock (IS_LOCKED column in WLCS_SEQUENCER) before incrementing the current value of a sequence. Two properties can be defined in the weblogiccommerce.properties file to control the number of retries and the datasource name to use for obtaining a database connection:

- `commerce.jdbcSequencer.maxRetry` default value is 5 (1 second wait each retry)
- `commerce.jdbcSequencer.dataSource.name` default value is "weblogic.jdbc.jts.commercePool"

Note:JDBSequencer must run in WebLogic because it must suspend the current transaction when allocating a new block of sequence numbers.

See Also
  `Sequencer`, `SequencerFactory`

Field Summary
`static long` | `DEFAULT_CACHE_SIZE` Deprecated
`static String` | `DEFAULT_SEQUENCE_NAME` Deprecated
`static String` | `DEFAULT_SEQUENCER_DATASOURCE_NAME` Deprecated
`static String` | `DEFAULT_SEQUENCER_NAME` Deprecated
`static long` | `DEFAULT_STEP_SIZE` Deprecated
`static String` | `SEQUENCE_LOCK_IDENTIFIER` Deprecated
`static String` | `SEQUENCE_NAME_IDENTIFIER` Deprecated
`static String` | `SEQUENCE_VALUE_IDENTIFIER` Deprecated
`static String` | `SEQUENCER_DATASOURCE_NAME_PROPERTY` Deprecated
`static String` | `SEQUENCER_MAX_RETRY_PROPERTY` Deprecated

Constructor Summary
`JDBCSequencer()` Deprecated Default constructor.
`JDBCSequencer(String sequencerName, String sequenceName)` Deprecated Creates a new `JDBCSequencer` with the supplied sequencer name and managed sequence name.
`JDBCSequencer(String sequencerName, String sequenceName, long cacheSize)` Deprecated Creates a new `JDBCSequencer` with the supplied sequencer name, managed sequence name, and cache size.
`JDBCSequencer(String sequencerName, String sequenceName, long cacheSize, long stepSize)` Deprecated Creates a new `JDBCSequencer` with the supplied sequencer name, managed sequence name, cache size, and step size.

Method Summary
`protected void` | `allocateSequenceBlock()` Deprecated Allocates a new block of sequence numbers from the database.
`protected void` | `cleanUpResources()` Deprecated Closes any open DB resources.
`long` | `getCacheSize()` Deprecated Returns the cache size.
`long` | `getCurrent()` Deprecated Gets the current sequence number associated with this sequencer.
`long` | `getCurrent(Connection databaseConnection)` Deprecated JDBCSequencer must allocate the sequence block using a separate transaction because the database updates can be undone if a rollback occurs on the passed connection. Replaced by `getNext()`
`long` | `getIncrementAmount()` Deprecated Replaced by getCacheSize
`long` | `getNext()` Deprecated Gets the next sequence number.
`long` | `getNext(Connection databaseConnection)` Deprecated JDBCSequencer must allocate the sequence block using a separate transaction because the database updates can be undone if a rollback occurs on the passed connection. Replaced by `getNext()`
`String` | `getSequenceName()` Deprecated Returns the name of the sequence that is managed by this sequencer.
`String` | `getSequencerName()` Deprecated Returns the name of this sequencer.
`long` | `getStepSize()` Deprecated Returns the step size.
`void` | `setCacheSize(long cacheSize)` Deprecated Sets the cache size.
`void` | `setIncrementAmount(long incrementAmount)` Deprecated Replaced by setCacheSize
`void` | `setSequenceName(String sequenceName)` Deprecated Sets the name of the sequence that is managed by this sequencer.
`void` | `setSequencerName(String sequencerName)` Deprecated Sets the name of this sequencer.
`void` | `setStepSize(long stepSize)` Deprecated Sets the step size.

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

Field Detail

### DEFAULT_CACHE_SIZE

    public static final long DEFAULT_CACHE_SIZE

  Deprecated
  See Also
    Constants Summary

### DEFAULT_STEP_SIZE

    public static final long DEFAULT_STEP_SIZE

  Deprecated
  See Also
    Constants Summary

### SEQUENCER_DATASOURCE_NAME_PROPERTY

    public static final String SEQUENCER_DATASOURCE_NAME_PROPERTY

  Deprecated
  See Also
    Constants Summary

### SEQUENCER_MAX_RETRY_PROPERTY

    public static final String SEQUENCER_MAX_RETRY_PROPERTY

  Deprecated
  See Also
    Constants Summary

### DEFAULT_SEQUENCER_DATASOURCE_NAME

    public static final String DEFAULT_SEQUENCER_DATASOURCE_NAME

  Deprecated
  See Also
    Constants Summary

### DEFAULT_SEQUENCER_NAME

    public static final String DEFAULT_SEQUENCER_NAME

  Deprecated
  See Also
    Constants Summary

### DEFAULT_SEQUENCE_NAME

    public static final String DEFAULT_SEQUENCE_NAME

  Deprecated
  See Also
    Constants Summary

### SEQUENCE_NAME_IDENTIFIER

    public static final String SEQUENCE_NAME_IDENTIFIER

  Deprecated
  See Also
    Constants Summary

### SEQUENCE_VALUE_IDENTIFIER

    public static final String SEQUENCE_VALUE_IDENTIFIER

  Deprecated
  See Also
    Constants Summary

### SEQUENCE_LOCK_IDENTIFIER

    public static final String SEQUENCE_LOCK_IDENTIFIER

  Deprecated
  See Also
    Constants Summary

Constructor Detail

### JDBCSequencer

    public JDBCSequencer()

  Deprecated
  Default constructor.

### JDBCSequencer

    public JDBCSequencer(String sequencerName,
                         String sequenceName)

  Deprecated
  Creates a new `JDBCSequencer` with the supplied sequencer name and managed sequence name.

  Parameters
    `sequencerName` - The name of the new sequencer.
    `sequenceName` - The name of the managed sequence.

### JDBCSequencer

    public JDBCSequencer(String sequencerName,
                         String sequenceName,
                         long cacheSize)

  Deprecated
  Creates a new `JDBCSequencer` with the supplied sequencer name, managed sequence name, and cache size.

  Parameters
    `sequencerName` - The name of the new sequencer.
    `sequenceName` - The name of the managed sequence.
    `cacheSize` - The cache size.

### JDBCSequencer

    public JDBCSequencer(String sequencerName,
                         String sequenceName,
                         long cacheSize,
                         long stepSize)

  Deprecated
  Creates a new `JDBCSequencer` with the supplied sequencer name, managed sequence name, cache size, and step size.

  Parameters
    `sequencerName` - The name of the new sequencer.
    `sequenceName` - The name of the managed sequence.
    `cacheSize` - The cache size.

Method Detail

### getNext

    public long getNext(Connection databaseConnection)
                 throws SQLException

  Deprecated JDBCSequencer must allocate the sequence block using a separate transaction because the database updates can be undone if a rollback occurs on the passed connection. Replaced by `getNext()`

  Gets the next sequence number using the supplied database connection. The database connection will not be automatically closed upon method return. This class is thread safe.

  Specified by:
    `getNext` in interface `Sequencer`
  Parameters
    `databaseConnection` - The database connection used to generate the next sequence number.
  Throws
    ``SQLException`` - on error.
    `SQLException`

### getNext

    public long getNext()
                 throws SQLException

  Deprecated
  Gets the next sequence number. A new block of sequence numbers is allocated if the cache of numbers is exhausted.

  Returns
    the next sequence number
  Throws
    ``SQLException`` - on error.
    `SQLException`

### getCurrent

    public long getCurrent(Connection databaseConnection)
                    throws SQLException

  Deprecated JDBCSequencer must allocate the sequence block using a separate transaction because the database updates can be undone if a rollback occurs on the passed connection. Replaced by `getNext()`

  Gets the current sequence number associated with this sequencer.

  Specified by:
    `getCurrent` in interface `Sequencer`
  Parameters
    `databaseConnection` - The database connection used to generate the next sequence number.
  Throws
    ``SQLException`` - on error.
    `SQLException`

### getCurrent

    public long getCurrent()
                    throws SQLException

  Deprecated
  Gets the current sequence number associated with this sequencer.

  Throws
    ``SQLException`` - on error.
    `SQLException`

### allocateSequenceBlock

    protected final void allocateSequenceBlock()
                                        throws SQLException

  Deprecated
  Allocates a new block of sequence numbers from the database. If a transaction is in progress, it is suspended during the database updates required for incrementing the current value of the sequence and resumed after.

  Throws
    ``SQLException`` - on error.
    `SQLException`

### cleanUpResources

    protected final void cleanUpResources()

  Deprecated
  Closes any open DB resources.

### getIncrementAmount

    public long getIncrementAmount()

  Deprecated Replaced by getCacheSize

  Returns the increment amount. The increment amount defines how often the sequencer will allocate a block of unique sequence numbers from the database. When the sequencer exhausts its supplied of allocated numbers, it will allocate a new sequence of numbers from the database.

  Specified by:
    `getIncrementAmount` in interface `Sequencer`
  Returns
    The increment amount.
  See Also
    `getCacheSize()`

### setIncrementAmount

    public void setIncrementAmount(long incrementAmount)

  Deprecated Replaced by setCacheSize

  Sets the increment amount. The increment amount defines how often the sequencer will allocate a block of unique sequence numbers from the database. When the sequencer exhausts its supplied of allocated numbers, it will allocate a new sequence of numbers from the database.

  Specified by:
    `setIncrementAmount` in interface `Sequencer`
  Parameters
    `incrementAmount` - The increment amount.
  See Also
    `setCacheSize(long)`

### getCacheSize

    public long getCacheSize()

  Deprecated
  Returns the cache size. The cache size defines how often the sequencer will allocate a block of unique sequence numbers from the database. When the sequencer exhausts its supplied of allocated numbers, it will allocate a new sequence of numbers from the database.

  Specified by:
    `getCacheSize` in interface `Sequencer`
  Returns
    The cache size.

### setCacheSize

    public void setCacheSize(long cacheSize)

  Deprecated
  Sets the cache size. The cache size defines how often the sequencer will allocate a block of unique sequence numbers from the database. When the sequencer exhausts its supplied of allocated numbers, it will allocate a new sequence of numbers from the database.

  Specified by:
    `setCacheSize` in interface `Sequencer`
  Parameters
    `cacheSize` - The cache size.

### getStepSize

    public long getStepSize()

  Deprecated
  Returns the step size. The step size determines the difference between the values returned from successive calls to `getNext()`.

  Specified by:
    `getStepSize` in interface `Sequencer`
  Returns
    The step size.

### setStepSize

    public void setStepSize(long stepSize)

  Deprecated
  Sets the step size. The step size determines the difference between the values returned from successive calls to `getNext()`.

  Specified by:
    `setStepSize` in interface `Sequencer`
  Parameters
    `stepSize` - The step size.

### getSequencerName

    public String getSequencerName()

  Deprecated
  Returns the name of this sequencer.

  Specified by:
    `getSequencerName` in interface `Sequencer`
  Returns
    The sequencer name.

### setSequencerName

    public void setSequencerName(String sequencerName)

  Deprecated
  Sets the name of this sequencer.

  Specified by:
    `setSequencerName` in interface `Sequencer`
  Parameters
    `sequencerName` - The new sequencer name.

### getSequenceName

    public String getSequenceName()

  Deprecated
  Returns the name of the sequence that is managed by this sequencer.

  Specified by:
    `getSequenceName` in interface `Sequencer`
  Returns
    The sequence name.

### setSequenceName

    public void setSequenceName(String sequenceName)

  Deprecated
  Sets the name of the sequence that is managed by this sequencer.

  Specified by:
    `setSequenceName` in interface `Sequencer`
  Parameters
    `sequenceName` - The new sequence name.

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