/**
* Method to reserve a block of identities. Note : Only allocates a single id always.
*
* @param size The block size
* @return The reserved block
*/
public ValueGenerationBlock reserveBlock(long size) {
// search an Id in the database
PreparedStatement ps = null;
ResultSet rs = null;
RDBMSStoreManager rdbmsMgr = (RDBMSStoreManager) storeMgr;
SQLController sqlControl = rdbmsMgr.getSQLController();
try {
String stmt = getStatement();
ps = sqlControl.getStatementForUpdate(connection, stmt, false);
rs = sqlControl.executeStatementQuery(null, connection, stmt, ps);
if (!rs.next()) {
return new ValueGenerationBlock(new Object[] {Long.valueOf(1)});
}
return new ValueGenerationBlock(new Object[] {Long.valueOf(rs.getLong(1) + 1)});
} catch (SQLException e) {
// TODO adds a message correspondent to the exception.
// we need to work to create user friendly messages
throw new ValueGenerationException(e.getMessage());
} finally {
try {
if (rs != null) {
rs.close();
}
if (ps != null) {
sqlControl.closeStatement(connection, ps);
}
} catch (SQLException e) {
// no recoverable error
}
}
}
public void executeClear(ObjectProvider ownerOP) {
String clearStmt = getClearStmt();
try {
ExecutionContext ec = ownerOP.getExecutionContext();
ManagedConnection mconn = storeMgr.getConnection(ec);
SQLController sqlControl = storeMgr.getSQLController();
try {
PreparedStatement ps = sqlControl.getStatementForUpdate(mconn, clearStmt, false);
try {
int jdbcPosition = 1;
jdbcPosition =
BackingStoreHelper.populateOwnerInStatement(ownerOP, ec, ps, jdbcPosition, this);
if (getRelationDiscriminatorMapping() != null) {
BackingStoreHelper.populateRelationDiscriminatorInStatement(ec, ps, jdbcPosition, this);
}
sqlControl.executeStatementUpdate(ec, mconn, clearStmt, ps, true);
} finally {
sqlControl.closeStatement(mconn, ps);
}
} finally {
mconn.release();
}
} catch (SQLException e) {
throw new NucleusDataStoreException(Localiser.msg("056013", clearStmt), e);
}
}
/**
* Clear the association from owner to all elements. Provides cascade-delete when the elements
* being deleted are PC types.
*
* @param ownerOP ObjectProvider for the container.
*/
public void clear(ObjectProvider ownerOP) {
Collection dependentElements = null;
CollectionMetaData collmd = ownerMemberMetaData.getCollection();
boolean dependent = collmd.isDependentElement();
if (ownerMemberMetaData.isCascadeRemoveOrphans()) {
dependent = true;
}
if (dependent && !collmd.isEmbeddedElement() && !collmd.isSerializedElement()) {
// Retain the dependent elements that need deleting after clearing
dependentElements = new HashSet();
Iterator iter = iterator(ownerOP);
while (iter.hasNext()) {
dependentElements.add(iter.next());
}
}
String clearStmt = getClearStmt();
try {
ExecutionContext ec = ownerOP.getExecutionContext();
ManagedConnection mconn = storeMgr.getConnection(ec);
SQLController sqlControl = storeMgr.getSQLController();
try {
PreparedStatement ps = sqlControl.getStatementForUpdate(mconn, clearStmt, false);
try {
int jdbcPosition = 1;
jdbcPosition =
BackingStoreHelper.populateOwnerInStatement(ownerOP, ec, ps, jdbcPosition, this);
if (relationDiscriminatorMapping != null) {
BackingStoreHelper.populateRelationDiscriminatorInStatement(ec, ps, jdbcPosition, this);
}
sqlControl.executeStatementUpdate(ec, mconn, clearStmt, ps, true);
} finally {
sqlControl.closeStatement(mconn, ps);
}
} finally {
mconn.release();
}
} catch (SQLException e) {
throw new NucleusDataStoreException(Localiser.msg("056013", clearStmt), e);
}
// Cascade-delete
if (dependentElements != null && dependentElements.size() > 0) {
Iterator iter = dependentElements.iterator();
while (iter.hasNext()) {
Object obj = iter.next();
if (ownerOP.getExecutionContext().getApiAdapter().isDeleted(obj)) {
// Element is tagged for deletion so will be deleted at flush(), and we dont need it
// immediately
} else {
ownerOP.getExecutionContext().deleteObjectInternal(obj);
}
}
}
}
