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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
import org.hibernate.boot.model.FunctionContributions;
import org.hibernate.boot.model.TypeContributions;
import org.hibernate.community.dialect.identity.GaussDBIdentityColumnSupport;
import org.hibernate.community.dialect.lock.internal.GaussDBLockingSupport;
import org.hibernate.community.dialect.sequence.GaussDBSequenceSupport;
import org.hibernate.dialect.BooleanDecoder;
import org.hibernate.dialect.Dialect;
Expand All @@ -29,6 +30,7 @@
import org.hibernate.dialect.TimeZoneSupport;
import org.hibernate.dialect.aggregate.AggregateSupport;
import org.hibernate.dialect.identity.IdentityColumnSupport;
import org.hibernate.dialect.lock.spi.LockingSupport;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.LimitLimitHandler;
import org.hibernate.dialect.sequence.SequenceSupport;
Expand Down Expand Up @@ -148,6 +150,7 @@
* <a href="https://support.huaweicloud.com/function-gaussdb/index.html">GaussDB documentation</a>.
*
* @author liubao
* @author chen zhida
*
* Notes: Original code of this class is based on PostgreSQLDialect.
*/
Expand Down Expand Up @@ -1121,6 +1124,11 @@ public String getReadLockString(String aliases, int timeout) {
return withTimeout(" for share of " + aliases, timeout );
}

@Override
public LockingSupport getLockingSupport() {
return GaussDBLockingSupport.LOCKING_SUPPORT;
}

@Override
public String getForUpdateNowaitString() {
return supportsNoWait()
Expand Down
Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
/*
* SPDX-License-Identifier: Apache-2.0
* Copyright Red Hat Inc. and Hibernate Authors
*/
package org.hibernate.community.dialect.lock.internal;

import jakarta.persistence.Timeout;
import org.hibernate.dialect.RowLockStrategy;
import org.hibernate.dialect.lock.spi.ConnectionLockTimeoutStrategy;
import org.hibernate.dialect.lock.spi.LockTimeoutType;
import org.hibernate.dialect.lock.spi.LockingSupport;
import org.hibernate.dialect.lock.spi.OuterJoinLockingType;


import static org.hibernate.Timeouts.NO_WAIT_MILLI;
import static org.hibernate.Timeouts.SKIP_LOCKED_MILLI;
import static org.hibernate.Timeouts.WAIT_FOREVER_MILLI;
import static org.hibernate.dialect.lock.spi.LockTimeoutType.QUERY;

/**
* @author chen zhida
*
* Notes: Original code of this class is based on PostgreSQLLockingSupport.
*/
public class GaussDBLockingSupport implements LockingSupport, LockingSupport.Metadata, ConnectionLockTimeoutStrategy {
public static final LockingSupport LOCKING_SUPPORT = new GaussDBLockingSupport();
private final boolean supportsNoWait;
private final boolean supportsSkipLocked;

public GaussDBLockingSupport() {
this( true, true );
}

public GaussDBLockingSupport(boolean supportsNoWait, boolean supportsSkipLocked) {
this.supportsNoWait = supportsNoWait;
this.supportsSkipLocked = supportsSkipLocked;
}

@Override
public Metadata getMetadata() {
return this;
}

@Override
public RowLockStrategy getWriteRowLockStrategy() {
return RowLockStrategy.TABLE;
}

@Override
public LockTimeoutType getLockTimeoutType(Timeout timeout) {
return switch ( timeout.milliseconds() ) {
case NO_WAIT_MILLI -> supportsNoWait ? QUERY : LockTimeoutType.NONE;
case SKIP_LOCKED_MILLI -> supportsSkipLocked ? QUERY : LockTimeoutType.NONE;
case WAIT_FOREVER_MILLI -> LockTimeoutType.NONE;
// we can apply a timeout via the connection
default -> LockTimeoutType.CONNECTION;
};
}

@Override
public OuterJoinLockingType getOuterJoinLockingType() {
return OuterJoinLockingType.UNSUPPORTED;
}

@Override
public ConnectionLockTimeoutStrategy getConnectionLockTimeoutStrategy() {
return this;
}

@Override
public Level getSupportedLevel() {
return Level.NONE;
}
}