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Locks made transaction termination aware
This commit makes community and forseti locks react on transaction termination by throwing TransactionTerminatedException. Previously when a terminated transaction was waiting to grab the lock this waiting did not end. Feature will allow us to develop kill-transaction functionality for transactions that are basically starved on locks. Feature is currently guarded by a boolean system property 'tx_termination_aware_locks' and off by default.
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34 changes: 34 additions & 0 deletions
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community/kernel/src/main/java/org/neo4j/kernel/impl/api/tx/TxTermination.java
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/* | |||
* Copyright (c) 2002-2016 "Neo Technology," | |||
* Network Engine for Objects in Lund AB [http://neotechnology.com] | |||
* | |||
* This file is part of Neo4j. | |||
* | |||
* Neo4j is free software: you can redistribute it and/or modify | |||
* it under the terms of the GNU General Public License as published by | |||
* the Free Software Foundation, either version 3 of the License, or | |||
* (at your option) any later version. | |||
* | |||
* 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 for more details. | |||
* | |||
* You should have received a copy of the GNU General Public License | |||
* along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
*/ | |||
package org.neo4j.kernel.impl.api.tx; | |||
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public interface TxTermination | |||
{ | |||
TxTermination NONE = new TxTermination() | |||
{ | |||
@Override | |||
public boolean shouldBeTerminated() | |||
{ | |||
return false; | |||
} | |||
}; | |||
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boolean shouldBeTerminated(); | |||
} |
40 changes: 40 additions & 0 deletions
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community/kernel/src/main/java/org/neo4j/kernel/impl/api/tx/TxTerminationImpl.java
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/* | |||
* Copyright (c) 2002-2016 "Neo Technology," | |||
* Network Engine for Objects in Lund AB [http://neotechnology.com] | |||
* | |||
* This file is part of Neo4j. | |||
* | |||
* Neo4j is free software: you can redistribute it and/or modify | |||
* it under the terms of the GNU General Public License as published by | |||
* the Free Software Foundation, either version 3 of the License, or | |||
* (at your option) any later version. | |||
* | |||
* 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 for more details. | |||
* | |||
* You should have received a copy of the GNU General Public License | |||
* along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
*/ | |||
package org.neo4j.kernel.impl.api.tx; | |||
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public class TxTerminationImpl implements TxTermination | |||
{ | |||
private volatile boolean terminated; | |||
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public void markForTermination() | |||
{ | |||
terminated = true; | |||
} | |||
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public boolean shouldBeTerminated() | |||
{ | |||
return terminated; | |||
} | |||
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public void reset() | |||
{ | |||
terminated = false; | |||
} | |||
} |
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