io.trino.plugin.deltalake.DeltaLakeTransactionManager Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.trino.plugin.deltalake;
import com.google.errorprone.annotations.concurrent.GuardedBy;
import com.google.inject.Inject;
import io.trino.spi.classloader.ThreadContextClassLoader;
import io.trino.spi.connector.ConnectorTransactionHandle;
import io.trino.spi.security.ConnectorIdentity;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class DeltaLakeTransactionManager
{
private final DeltaLakeMetadataFactory metadataFactory;
private final Map transactions = new ConcurrentHashMap<>();
@Inject
public DeltaLakeTransactionManager(DeltaLakeMetadataFactory metadataFactory)
{
this.metadataFactory = requireNonNull(metadataFactory, "metadataFactory is null");
}
public void begin(ConnectorTransactionHandle transaction)
{
MemoizedMetadata previousValue = transactions.putIfAbsent(transaction, new MemoizedMetadata());
checkState(previousValue == null);
}
public DeltaLakeMetadata get(ConnectorTransactionHandle transaction, ConnectorIdentity identity)
{
return transactions.get(transaction).get(identity);
}
public void commit(ConnectorTransactionHandle transaction)
{
MemoizedMetadata deltaLakeMetadata = transactions.remove(transaction);
checkArgument(deltaLakeMetadata != null, "no such transaction: %s", transaction);
}
public void rollback(ConnectorTransactionHandle transaction)
{
MemoizedMetadata transactionalMetadata = transactions.remove(transaction);
checkArgument(transactionalMetadata != null, "no such transaction: %s", transaction);
transactionalMetadata.optionalGet().ifPresent(metadata -> {
try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(getClass().getClassLoader())) {
metadata.rollback();
}
});
}
private class MemoizedMetadata
{
@GuardedBy("this")
private DeltaLakeMetadata metadata;
public synchronized Optional optionalGet()
{
return Optional.ofNullable(metadata);
}
public synchronized DeltaLakeMetadata get(ConnectorIdentity identity)
{
if (metadata == null) {
try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(getClass().getClassLoader())) {
metadata = metadataFactory.create(identity);
}
}
return metadata;
}
}
}