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CloudGraph(tm) is a suite of Service Data Object (SDO) 2.1 services designed for relational and big-table style "cloud" databases, such as HBase and others.
/**
* CloudGraph Community Edition (CE) License
*
* This is a community release of CloudGraph, a dual-license suite of
* Service Data Object (SDO) 2.1 services designed for relational and
* big-table style "cloud" databases, such as HBase and others.
* This particular copy of the software is released under the
* version 2 of the GNU General Public License. CloudGraph was developed by
* TerraMeta Software, Inc.
*
* Copyright (c) 2013, TerraMeta Software, Inc. All rights reserved.
*
* General License information can be found below.
*
* This distribution may include materials developed by third
* parties. For license and attribution notices for these
* materials, please refer to the documentation that accompanies
* this distribution (see the "Licenses for Third-Party Components"
* appendix) or view the online documentation at
* find(Query[] queries) {
if (queries == null)
throw new IllegalArgumentException("expected non-null 'queries' argument");
Connection con = null;
try {
if (log.isDebugEnabled())
log.debug("getting connection");
con = ProviderManager.instance().getConnection();
if (con.getAutoCommit()) {
if (log.isDebugEnabled())
log.debug("turning off connection autocommit for multi graph query");
con.setAutoCommit(false);
}
//TODO: make transaction isolation configurable
RDBMSVendorName vendor = PlasmaConfig.getInstance().getRDBMSProviderVendor(DataAccessProviderName.JDBC);
switch (vendor) {
case ORACLE:
con.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
break;
case MYSQL:
con.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
break;
default:
}
if (log.isDebugEnabled())
log.debug("using transaction isolation level "
+ con.getTransactionIsolation() + " for multi graph query");
} catch (SQLException e2) {
if (con != null)
try {
if (log.isDebugEnabled())
log.debug("closing connection");
con.close();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
throw new DataAccessException(e2);
}
GraphQuery dispatcher = new GraphQuery(con);
List list = new ArrayList();
Timestamp snapshotDate = new Timestamp((new Date()).getTime());
try {
for (int i = 0; i < queries.length; i++)
{
validate(queries[i]);
if (log.isDebugEnabled()) {
log(queries[i]);
}
DataGraph[] results = dispatcher.find(queries[i], snapshotDate);
list.add(results);
}
return list;
}
finally {
if (con != null)
try {
if (log.isDebugEnabled())
log.debug("closing connection");
con.close();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
}
}
public SnapshotMap commit(DataGraph dataGraph, String username) {
if (dataGraph == null)
throw new IllegalArgumentException("expected non-null 'dataGraph' argument");
if (username == null)
throw new IllegalArgumentException("expected non-null 'username' argument");
if (username.trim().length() == 0)
throw new IllegalArgumentException("unexpected zero length 'username' argument");
SnapshotMap snapshotMap = new SnapshotMap(new Timestamp((new Date()).getTime()));
if (log.isDebugEnabled())
log.debug("getting connection");
Connection con = null;
try {
con = ProviderManager.instance().getConnection();
if (con.getAutoCommit()) {
if (log.isDebugEnabled())
log.debug("turning off connection autocommit for graph commit");
con.setAutoCommit(false);
}
//TODO: make transaction isolation configurable
con.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
if (log.isDebugEnabled())
log.debug("using transaction isolation level "
+ con.getTransactionIsolation() + " forgraph commit");
} catch (SQLException e2) {
try {
if (log.isDebugEnabled())
log.debug("closing connection");
con.close();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
throw new DataAccessException(e2);
}
DataGraphDispatcher dispatcher =
new GraphDispatcher(snapshotMap,
username, con);
try {
dispatcher.commit(dataGraph);
con.commit();
return snapshotMap;
}
catch (DataAccessException e) {
if (log.isDebugEnabled())
log.debug(e.getMessage(), e);
try {
con.rollback();
} catch (SQLException e1) {
log.error(e.getMessage(), e1);
}
throw e;
}
catch (Throwable t) {
if (log.isDebugEnabled())
log.debug(t.getMessage(), t);
try {
con.rollback();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
throw new DataAccessException(t);
}
finally {
if (con != null)
try {
if (log.isDebugEnabled())
log.debug("closing connection");
con.close();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
dispatcher.close();
}
}
public SnapshotMap commit(DataGraph[] dataGraphs, String username) {
if (dataGraphs == null)
throw new IllegalArgumentException("expected non-null 'dataGraphs' argument");
if (username == null)
throw new IllegalArgumentException("expected non-null 'username' argument");
if (username.trim().length() == 0)
throw new IllegalArgumentException("unexpected zero length 'username' argument");
SnapshotMap snapshotMap = new SnapshotMap(new Timestamp((new Date()).getTime()));
Connection con = null;
try {
if (log.isDebugEnabled())
log.debug("getting connection");
con = ProviderManager.instance().getConnection();
if (con.getAutoCommit()) {
if (log.isDebugEnabled())
log.debug("turning off connection autocommit for multi graph commit");
con.setAutoCommit(false);
}
//TODO: make transaction isolation configurable
con.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
if (log.isDebugEnabled())
log.debug("using transaction isolation level "
+ con.getTransactionIsolation() + " for multi graph commit");
} catch (SQLException e2) {
if (con != null)
try {
if (log.isDebugEnabled())
log.debug("closing connection");
con.close();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
throw new DataAccessException(e2);
}
DataGraphDispatcher dispatcher =
new GraphDispatcher(snapshotMap,
username, con);
try {
dispatcher.commit(dataGraphs);
con.commit();
return snapshotMap;
}
catch (DataAccessException e) {
try {
con.rollback();
} catch (SQLException e1) {
log.error(e1.getMessage(), e1);
}
throw e;
}
catch (Throwable t) {
try {
con.rollback();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
throw new DataAccessException(t);
}
finally {
if (con != null)
try {
if (log.isDebugEnabled())
log.debug("closing connection");
con.close();
} catch (SQLException e) {
log.error(e.getMessage(), e);
}
dispatcher.close();
}
}
private void validate(Query query)
{
From from = (From)query.getFromClause();
Type type = PlasmaTypeHelper.INSTANCE.getType(
from.getEntity().getNamespaceURI(),
from.getEntity().getName());
log.debug("validating query");
new QueryValidator((Query)query, type);
}
private void log(Query query)
{
String xml = "";
PlasmaQueryDataBinding binding;
try {
binding = new PlasmaQueryDataBinding(
new DefaultValidationEventHandler());
xml = binding.marshal(query);
} catch (JAXBException e) {
} catch (SAXException e) {
}
//log.debug("query: " + xml);
}
@Override
public DataGraph[] find(org.plasma.query.Query query, JobContext context)
throws IOException {
return this.find(query.getModel());
}
@Override
public void commit(DataGraph graph, JobContext context) throws IOException {
String username = "graph-service";
if (context != null)
username = context.getJobName();
this.commit(graph, username);
}
@Override
public void commit(DataGraph[] graphs, JobContext context)
throws IOException {
String username = "graph-service";
if (context != null)
username = context.getJobName();
this.commit(graphs, username);
}
}
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