/*
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Dec 1st 2001, Fermi National Accelerator Laboratory (FNAL) documents and
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about the software to the Fermilab Software Providers.
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may be used to endorse or promote products derived from this software
without specific prior written permission.
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*/
package org.dcache.db;
import com.google.common.collect.ForwardingObject;
import org.slf4j.LoggerFactory;
import javax.sql.DataSource;
import java.io.Closeable;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;
import org.dcache.alarms.AlarmMarkerFactory;
import org.dcache.alarms.PredefinedAlarm;
import org.dcache.util.NetworkUtils;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* A decorator which allows exception thrown by the connection
* factory to be marked as alarms.
*
* @author arossi
*/
public class AlarmEnabledDataSource extends ForwardingObject implements DataSource, Closeable
{
private static final org.slf4j.Logger LOGGER =
LoggerFactory.getLogger(DataSource.class);
private final DataSource delegate;
private final String connectorName;
private final String url;
/**
* @param connectorName alarms will be identified by a combination of
* this name, the connection url and the canonical name of
* this client host.
*/
public AlarmEnabledDataSource(String url,
String connectorName,
DataSource delegate) {
this.connectorName = checkNotNull(connectorName);
this.url = checkNotNull(url);
this.delegate = checkNotNull(delegate);
}
/** Accessor for admin shell. */
public DataSource getDelegate()
{
return delegate();
}
@Override
protected DataSource delegate()
{
return delegate;
}
@Override
public PrintWriter getLogWriter() throws SQLException {
return delegate().getLogWriter();
}
@Override
@SuppressWarnings("unchecked")
public <T> T unwrap(Class<T> iface) throws SQLException {
if (iface.isInstance(delegate())) {
return (T) delegate();
}
return delegate().unwrap(iface);
}
@Override
public void setLogWriter(PrintWriter out) throws SQLException {
delegate().setLogWriter(out);
}
@Override
public boolean isWrapperFor(Class<?> iface) throws SQLException {
if (iface.isInstance(delegate())) {
return true;
}
return delegate().isWrapperFor(iface);
}
@Override
public Connection getConnection() throws SQLException {
try {
return delegate().getConnection();
} catch (SQLException sql) {
LOGGER.error(AlarmMarkerFactory.getMarker(PredefinedAlarm.DB_CONNECTION_FAILURE,
url,
connectorName,
NetworkUtils.getCanonicalHostName()),
"Could not get connection to database", sql);
throw sql;
}
}
@Override
public void setLoginTimeout(int seconds) throws SQLException {
delegate().setLoginTimeout(seconds);
}
@Override
public Connection getConnection(String username, String password)
throws SQLException {
try {
return delegate().getConnection(username, password);
} catch (SQLException sql) {
LOGGER.error(AlarmMarkerFactory.getMarker(PredefinedAlarm.DB_CONNECTION_FAILURE,
url,
connectorName,
NetworkUtils.getCanonicalHostName()),
"Could not get connection to database", sql);
throw sql;
}
}
@Override
public int getLoginTimeout() throws SQLException {
return delegate().getLoginTimeout();
}
@Override
public Logger getParentLogger() throws SQLFeatureNotSupportedException {
return delegate().getParentLogger();
}
@Override
public void close() throws IOException {
if (delegate() instanceof Closeable) {
((Closeable) delegate()).close();
}
}
}