Package org.neo4j.graphdb

Examples of org.neo4j.graphdb.Lock

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   * @param initialValue the initial value of the given generator
   * @return the next value in a sequence
   */
  public int nextValue(IdSourceKey idSourceKey, int increment, int initialValue) {
    Transaction tx = neo4jDb.beginTx();
    Lock lock = null;
    try {
      Node sequence = getSequence( idSourceKey );

      if ( sequence == null ) {
        // sequence nodes are expected to have been created up-front
        if ( idSourceKey.getMetadata().getType() == IdSourceType.SEQUENCE ) {
          throw new HibernateException( "Sequence missing: " + idSourceKey.getMetadata().getName() );
        }
        // table sequence nodes (think of them as rows in a generator table) are created upon first usage
        else {
          addTableSequence( idSourceKey.getMetadata(), (String) idSourceKey.getColumnValues()[0], initialValue );
          sequence = getSequence( idSourceKey );
        }
      }

      lock = tx.acquireWriteLock( sequence );
      int nextValue = updateSequenceValue( idSourceKey, sequence, increment );
      tx.success();
      lock.release();
      return nextValue;
    }
    finally {
      tx.close();
    }
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    throw log.cannotGenerateSequence( sequenceName( rowKey ) );
  }

  private int sequence(RowKey rowKey, int increment, final int initialValue) {
    Transaction tx = neo4jDb.beginTx();
    Lock lock = null;
    try {
      Node sequence = getOrCreateSequence( rowKey, initialValue );
      lock = tx.acquireWriteLock( sequence );
      int nextValue = updateSequenceValue( sequenceName( rowKey ), sequence, increment );
      tx.success();
      lock.release();
      return nextValue;
    }
    finally {
      tx.close();
    }
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    return sequence( rowKey, increment );
  }

  private int sequence(RowKey rowKey, int increment) {
    Transaction tx = neo4jDb.beginTx();
    Lock lock = null;
    try {
      Node sequence = getSequence( rowKey );
      lock = tx.acquireWriteLock( sequence );
      int nextValue = updateSequenceValue( sequence, increment );
      tx.success();
      lock.release();
      return nextValue;
    }
    finally {
      tx.close();
    }
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    return factory;
  }

  private int updateSequence(Node sequence, int increment) {
    Transaction tx = neo4jDb.beginTx();
    Lock lock = null;
    try {
      lock = tx.acquireWriteLock( sequence );
      int nextValue = updateSequenceValue( sequence, increment );
      tx.success();
      lock.release();
      return nextValue;
    }
    finally {
      tx.finish();
    }
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   * @param increment the difference between to consecutive values in the sequence
   * @return the next value in a sequence
   */
  public int nextValue(IdSourceKey idSourceKey, int increment) {
    Transaction tx = neo4jDb.beginTx();
    Lock lock = null;
    try {
      Node sequence = getSequence( idSourceKey );
      lock = tx.acquireWriteLock( sequence );
      int nextValue = updateSequenceValue( idSourceKey, sequence, increment );
      tx.success();
      lock.release();
      return nextValue;
    }
    finally {
      tx.close();
    }
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Related Classes of org.neo4j.graphdb.Lock

  • org.hibernate.ogm.datastore.neo4j.dialect.impl.Neo4jSequenceGenerator
  • org.hibernate.ogm.datastore.neo4j.impl.Neo4jSequenceGenerator
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