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IDEMPIERE-120 Refactor Query timeout Implementation - move most postgresql specific code to DB_PostgreSQL 

IDEMPIERE-121 Add API to support the locking of PO for update
(transplanted from e99036fafdbdc294ebb0b847d675e0aac42c1843)
This commit is contained in:
Heng Sin Low 2012-01-21 10:31:34 +08:00
parent 430f7e8e72
commit 0c15934a46
4 changed files with 153 additions and 60 deletions
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22
org.adempiere.base/src/org/compiere/db/AdempiereDatabase.java
View File

@ -25,6 +25,7 @@ import java.sql.Timestamp;
import javax.sql.DataSource;
import org.compiere.dbPort.Convert;
import org.compiere.model.PO;
//import org.compiere.util.CPreparedStatement;
@ -36,6 +37,10 @@ import org.compiere.dbPort.Convert;
*/
public interface AdempiereDatabase
{
/** default lock timeout, 60 seconds **/
static final int LOCK_TIME_OUT = 60;
/**
* Get Database Name
* @return database short name
@ -317,5 +322,22 @@ public interface AdempiereDatabase
*/
public String addPagingSQL(String sql, int start, int end);
/**
* set statement/query timeout for connection
* @param conn
* @param timeout
* @return original timeout setting
* @throws SQLException
*/
public int setStatementTimeout(Connection conn, int timeout) throws SQLException;
/**
* Lock PO for update
* @param po
* @param timeout
* @return true if lock is granted
*/
public boolean forUpdate(PO po, int timeout);
} // AdempiereDatabase

63
org.adempiere.base/src/org/compiere/util/DB.java
View File

@ -1012,50 +1012,17 @@ public final class DB
CPreparedStatement cs = ProxyFactory.newCPreparedStatement(ResultSet.TYPE_FORWARD_ONLY,
ResultSet.CONCUR_UPDATABLE, sql, trxName); // converted in call
boolean autoCommit = false;
int currentTimeout = 0;
int currentTimeout = -1;
try
{
setParameters(cs, params);
autoCommit = cs.getConnection().getAutoCommit();
//set timeout
if (timeOut > 0)
{
if (DB.isPostgreSQL())
{
try
{
Connection conn = cs.getConnection();
if (autoCommit)
{
conn.setAutoCommit(false);
}
else
{
ResultSet rs = null;
try
{
rs = conn.createStatement().executeQuery("select current_setting('statement_timeout')");
if (rs.next())
currentTimeout = rs.getInt(1);
}
finally
{
DB.close(rs);
}
}
Statement timeoutStatement = conn.createStatement();
timeoutStatement.execute("SET LOCAL statement_timeout TO " + ( timeOut * 1000 ));
if (log.isLoggable(Level.FINEST))
{
log.finest("Set statement timeout to " + timeOut);
}
} catch (SQLException e) {}
}
currentTimeout = DB.getDatabase().setStatementTimeout(cs.getConnection(), timeOut);
else
{
cs.setQueryTimeout(timeOut);
}
}
no = cs.executeUpdate();
// No Transaction - Commit
@ -1082,31 +1049,7 @@ public final class DB
{
try
{
if (autoCommit)
{
cs.getConnection().setAutoCommit(true);
}
else
{
if (currentTimeout > 0)
{
Statement timeoutStatement = cs.getConnection().createStatement();
timeoutStatement.execute("SET LOCAL statement_timeout TO " + ( currentTimeout * 1000 ));
if (log.isLoggable(Level.FINEST))
{
log.finest("Reset statement timeout to " + currentTimeout);
}
}
else
{
Statement timeoutStatement = cs.getConnection().createStatement();
timeoutStatement.execute("SET LOCAL statement_timeout TO Default");
if (log.isLoggable(Level.FINEST))
{
log.finest("Reset statement timeout to default");
}
}
}
DB.getDatabase().setStatementTimeout(cs.getConnection(), currentTimeout);
}
catch (SQLException e) {}
}

52
org.compiere.db.oracle.provider/src/org/compiere/db/DB_Oracle.java
View File

@ -24,6 +24,7 @@ import java.sql.DatabaseMetaData;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
@ -40,6 +41,7 @@ import org.adempiere.exceptions.DBException;
import org.compiere.Adempiere;
import org.compiere.dbPort.Convert;
import org.compiere.dbPort.Convert_Oracle;
import org.compiere.model.PO;
import org.compiere.util.CLogger;
import org.compiere.util.DB;
import org.compiere.util.DisplayType;
@ -1206,4 +1208,54 @@ public class DB_Oracle implements AdempiereDatabase
catch (Exception e) {}
return b;
}
@Override
public int setStatementTimeout(Connection conn, int timeout) throws SQLException {
//not supported by oracle
return -1;
}
@Override
public boolean forUpdate(PO po, int timeout) {
//only can lock for update if using trx
if (po.get_TrxName() == null)
return false;
String[] keyColumns = po.get_KeyColumns();
if (keyColumns != null && keyColumns.length > 0 && !po.is_new()) {
StringBuffer sqlBuffer = new StringBuffer(" SELECT ");
sqlBuffer.append(keyColumns[0])
.append(" FROM ")
.append(po.get_TableName())
.append(" WHERE ");
for(int i = 0; i < keyColumns.length; i++) {
if (i > 0)
sqlBuffer.append(" AND ");
sqlBuffer.append(keyColumns[i]).append(" = ? ");
}
sqlBuffer.append(" FOR UPDATE ");
sqlBuffer.append(" WAIT ").append((timeout > 0 ? timeout : LOCK_TIME_OUT));
PreparedStatement stmt = null;
ResultSet rs = null;
try {
stmt = DB.prepareStatement(sqlBuffer.toString(),
ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE, po.get_TrxName());
for(int i = 0; i < keyColumns.length; i++) {
stmt.setObject(i+1, po.get_Value(keyColumns[i]));
}
rs = stmt.executeQuery();
if (rs.next()) {
return true;
} else {
return false;
}
} catch (Exception e) {
log.log(Level.INFO, e.getLocalizedMessage(), e);
} finally {
DB.close(rs, stmt);
}
}
return false;
}
} // DB_Oracle

76
org.compiere.db.postgresql.provider/src/org/compiere/db/DB_PostgreSQL.java
View File

@ -23,6 +23,7 @@ import java.math.BigDecimal;
import java.net.URL;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
@ -39,6 +40,7 @@ import org.adempiere.db.postgresql.PostgreSQLBundleActivator;
import org.adempiere.exceptions.DBException;
import org.compiere.dbPort.Convert;
import org.compiere.dbPort.Convert_PostgreSQL;
import org.compiere.model.PO;
import org.compiere.util.CCache;
import org.compiere.util.CLogger;
import org.compiere.util.DB;
@ -928,4 +930,78 @@ public class DB_PostgreSQL implements AdempiereDatabase
catch (Exception e) {}
return b;
}
@Override
public int setStatementTimeout(Connection conn, int timeOut) throws SQLException {
int currentTimeout = 0;
boolean autoCommit = conn.getAutoCommit();
ResultSet rs = null;
try
{
rs = conn.createStatement().executeQuery("select current_setting('statement_timeout')");
if (rs.next())
currentTimeout = rs.getInt(1) / 1000;
}
finally
{
DB.close(rs);
}
Statement timeoutStatement = conn.createStatement();
String sql = "SET " + (autoCommit ? "SESSION" : "LOCAL") + " statement_timeout TO " + ( timeOut > 0 ? Integer.toString(timeOut * 1000) : " DEFAULT ");
timeoutStatement.execute(sql);
if (log.isLoggable(Level.FINEST))
{
log.finest("Set statement timeout to " + timeOut);
}
return currentTimeout;
}
@Override
public boolean forUpdate(PO po, int timeout) {
//only can lock for update if using trx
if (po.get_TrxName() == null)
return false;
String[] keyColumns = po.get_KeyColumns();
if (keyColumns != null && keyColumns.length > 0 && !po.is_new()) {
StringBuffer sqlBuffer = new StringBuffer(" SELECT ");
sqlBuffer.append(keyColumns[0])
.append(" FROM ")
.append(po.get_TableName())
.append(" WHERE ");
for(int i = 0; i < keyColumns.length; i++) {
if (i > 0)
sqlBuffer.append(" AND ");
sqlBuffer.append(keyColumns[i]).append(" = ? ");
}
sqlBuffer.append(" FOR UPDATE ");
PreparedStatement stmt = null;
ResultSet rs = null;
int currentTimeout = -1;
try {
stmt = DB.prepareStatement(sqlBuffer.toString(),
ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE, po.get_TrxName());
for(int i = 0; i < keyColumns.length; i++) {
stmt.setObject(i+1, po.get_Value(keyColumns[i]));
}
currentTimeout = setStatementTimeout(stmt.getConnection(), (timeout > 0 ? timeout : LOCK_TIME_OUT));
rs = stmt.executeQuery();
if (rs.next()) {
return true;
} else {
return false;
}
} catch (Exception e) {
log.log(Level.INFO, e.getLocalizedMessage(), e);
} finally {
try {
setStatementTimeout(stmt.getConnection(), currentTimeout);
} catch (SQLException e) {}
DB.close(rs, stmt);
}
}
return false;
}
} // DB_PostgreSQL