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/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj;
import java.util.TimerTask;
import com.mysql.cj.Query.CancelStatus;
import com.mysql.cj.conf.HostInfo;
import com.mysql.cj.conf.PropertyKey;
import com.mysql.cj.exceptions.OperationCancelledException;
import com.mysql.cj.protocol.a.NativeMessageBuilder;
import com.mysql.cj.util.StringUtils;
//TODO should not be protocol-specific
/**
* Thread used to implement query timeouts...Eventually we could be more
* efficient and have one thread with timers, but this is a straightforward
* and simple way to implement a feature that isn't used all that often.
*/
public class CancelQueryTaskImpl extends TimerTask implements CancelQueryTask {
Query queryToCancel;
Throwable caughtWhileCancelling = null;
boolean queryTimeoutKillsConnection = false;
public CancelQueryTaskImpl(Query cancellee) {
this.queryToCancel = cancellee;
NativeSession session = (NativeSession) cancellee.getSession();
this.queryTimeoutKillsConnection = session.getPropertySet().getBooleanProperty(PropertyKey.queryTimeoutKillsConnection).getValue();
}
@Override
public boolean cancel() {
boolean res = super.cancel();
this.queryToCancel = null;
return res;
}
@Override
public void run() {
Thread cancelThread = new Thread() {
@Override
public void run() {
Query localQueryToCancel = CancelQueryTaskImpl.this.queryToCancel;
if (localQueryToCancel == null) {
return;
}
NativeSession session = (NativeSession) localQueryToCancel.getSession();
if (session == null) {
return;
}
try {
if (CancelQueryTaskImpl.this.queryTimeoutKillsConnection) {
localQueryToCancel.setCancelStatus(CancelStatus.CANCELED_BY_TIMEOUT);
session.invokeCleanupListeners(new OperationCancelledException(Messages.getString("Statement.ConnectionKilledDueToTimeout")));
} else {
synchronized (localQueryToCancel.getCancelTimeoutMutex()) {
long origConnId = session.getThreadId();
HostInfo hostInfo = session.getHostInfo();
String database = hostInfo.getDatabase();
String user = StringUtils.isNullOrEmpty(hostInfo.getUser()) ? "" : hostInfo.getUser();
String password = StringUtils.isNullOrEmpty(hostInfo.getPassword()) ? "" : hostInfo.getPassword();
NativeSession newSession = new NativeSession(hostInfo, session.getPropertySet());
newSession.connect(hostInfo, user, password, database, 30000, new TransactionEventHandler() {
@Override
public void transactionCompleted() {
}
public void transactionBegun() {
}
});
newSession.sendCommand(new NativeMessageBuilder().buildComQuery(newSession.getSharedSendPacket(), "KILL QUERY " + origConnId),
false, 0);
localQueryToCancel.setCancelStatus(CancelStatus.CANCELED_BY_TIMEOUT);
}
}
// } catch (NullPointerException npe) {
// Case when connection closed while starting to cancel.
// We can't easily synchronise this, because then one thread can't cancel() a running query.
// Ignore, we shouldn't re-throw this, because the connection's already closed, so the statement has been timed out.
} catch (Throwable t) {
CancelQueryTaskImpl.this.caughtWhileCancelling = t;
} finally {
setQueryToCancel(null);
}
}
};
cancelThread.start();
}
public Throwable getCaughtWhileCancelling() {
return this.caughtWhileCancelling;
}
public void setCaughtWhileCancelling(Throwable caughtWhileCancelling) {
this.caughtWhileCancelling = caughtWhileCancelling;
}
public Query getQueryToCancel() {
return this.queryToCancel;
}
public void setQueryToCancel(Query queryToCancel) {
this.queryToCancel = queryToCancel;
}
}
