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MSSQLSelectForUpdateBasedProxyManager.java
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MSSQLSelectForUpdateBasedProxyManager.java
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/*-
* ========================LICENSE_START=================================
* Bucket4j
* %%
* Copyright (C) 2015 - 2022 Vladimir Bukhtoyarov
* %%
* 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.
* =========================LICENSE_END==================================
*/
package io.github.bucket4j.mssql;
import io.github.bucket4j.BucketExceptions;
import io.github.bucket4j.distributed.jdbc.PrimaryKeyMapper;
import io.github.bucket4j.distributed.jdbc.SQLProxyConfiguration;
import io.github.bucket4j.distributed.proxy.generic.select_for_update.AbstractSelectForUpdateBasedProxyManager;
import io.github.bucket4j.distributed.proxy.generic.select_for_update.LockAndGetResult;
import io.github.bucket4j.distributed.proxy.generic.select_for_update.SelectForUpdateBasedTransaction;
import io.github.bucket4j.distributed.remote.RemoteBucketState;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.MessageFormat;
import java.util.Objects;
import java.util.Optional;
/**
* The extension of Bucket4j library addressed to support "Microsoft SQL Server"
*
* <p>This implementation solves transaction/concurrency related problems via "SELECT WITH(ROWLOCK, UPDLOCK)"
* which can be considered as comparable equivalent of "SELECT FOR UPDATE" from SQL Standard syntax.
*
* @param <K> type of primary key
*/
public class MSSQLSelectForUpdateBasedProxyManager<K> extends AbstractSelectForUpdateBasedProxyManager<K> {
private final DataSource dataSource;
private final PrimaryKeyMapper<K> primaryKeyMapper;
private final String removeSqlQuery;
private final String updateSqlQuery;
private final String insertSqlQuery;
private final String selectSqlQuery;
MSSQLSelectForUpdateBasedProxyManager(Bucket4jMSSQL.MSSQLSelectForUpdateBasedProxyManagerBuilder<K> builder) {
super(builder.getClientSideConfig());
this.dataSource = builder.getDataSource();
this.primaryKeyMapper = builder.getPrimaryKeyMapper();
this.removeSqlQuery = MessageFormat.format("DELETE FROM {0} WHERE {1} = ?", builder.getTableName(), builder.getIdColumnName());
this.updateSqlQuery = MessageFormat.format("UPDATE {0} SET {1}=? WHERE {2}=?", builder.getTableName(), builder.getStateColumnName(), builder.getIdColumnName());
this.insertSqlQuery = MessageFormat.format(
"INSERT INTO {0}({1},{2}) VALUES(?, null)",
builder.getTableName(), builder.getIdColumnName(), builder.getStateColumnName());
this.selectSqlQuery = MessageFormat.format("SELECT {0} as state FROM {1} WITH(ROWLOCK, UPDLOCK) WHERE {2} = ?", builder.getStateColumnName(), builder.getTableName(), builder.getIdColumnName());
}
/**
* @deprecated use {@link Bucket4jMSSQL#selectForUpdateBasedBuilder(DataSource)} instead
*/
@Deprecated
public MSSQLSelectForUpdateBasedProxyManager(SQLProxyConfiguration<K> configuration) {
super(configuration.getClientSideConfig());
this.dataSource = Objects.requireNonNull(configuration.getDataSource());
this.primaryKeyMapper = configuration.getPrimaryKeyMapper();
this.removeSqlQuery = MessageFormat.format("DELETE FROM {0} WHERE {1} = ?", configuration.getTableName(), configuration.getIdName());
this.updateSqlQuery = MessageFormat.format("UPDATE {0} SET {1}=? WHERE {2}=?", configuration.getTableName(), configuration.getStateName(), configuration.getIdName());
this.insertSqlQuery = MessageFormat.format(
"INSERT INTO {0}({1},{2}) VALUES(?, null)",
configuration.getTableName(), configuration.getIdName(), configuration.getStateName());
this.selectSqlQuery = MessageFormat.format("SELECT {0} as state FROM {1} WITH(ROWLOCK, UPDLOCK) WHERE {2} = ?", configuration.getStateName(), configuration.getTableName(), configuration.getIdName());
}
@Override
protected SelectForUpdateBasedTransaction allocateTransaction(K key, Optional<Long> requestTimeoutNanos) {
Connection connection;
try {
connection = dataSource.getConnection();
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
return new SelectForUpdateBasedTransaction() {
@Override
public void begin(Optional<Long> requestTimeoutNanos) {
try {
connection.setAutoCommit(false);
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
}
@Override
public void rollback() {
try {
connection.rollback();
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
}
@Override
public void commit(Optional<Long> requestTimeoutNanos) {
try {
connection.commit();
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
}
@Override
public LockAndGetResult tryLockAndGet(Optional<Long> requestTimeoutNanos) {
try (PreparedStatement selectStatement = connection.prepareStatement(selectSqlQuery)) {
applyTimeout(selectStatement, requestTimeoutNanos);
primaryKeyMapper.set(selectStatement, 1, key);
try (ResultSet rs = selectStatement.executeQuery()) {
if (rs.next()) {
byte[] data = rs.getBytes("state");
return LockAndGetResult.locked(data);
} else {
return LockAndGetResult.notLocked();
}
}
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
}
@Override
public boolean tryInsertEmptyData(Optional<Long> requestTimeoutNanos) {
try (PreparedStatement insertStatement = connection.prepareStatement(insertSqlQuery)) {
applyTimeout(insertStatement, requestTimeoutNanos);
primaryKeyMapper.set(insertStatement, 1, key);
return insertStatement.executeUpdate() > 0;
} catch (SQLException e) {
if (e.getErrorCode() == 1205) {
// https://learn.microsoft.com/en-us/sql/relational-databases/errors-events/mssqlserver-1205-database-engine-error?view=sql-server-ver16
// another transaction won the lock, initial bucket dada will be inserted by other actor
return false;
} else if (e.getErrorCode() == 2627) {
// duplicate key, another parallel transaction has inserted the data
return false;
} else {
throw new BucketExceptions.BucketExecutionException(e);
}
}
}
@Override
public void update(byte[] data, RemoteBucketState newState, Optional<Long> requestTimeoutNanos) {
try {
try (PreparedStatement updateStatement = connection.prepareStatement(updateSqlQuery)) {
applyTimeout(updateStatement, requestTimeoutNanos);
updateStatement.setBytes(1, data);
primaryKeyMapper.set(updateStatement, 2, key);
updateStatement.executeUpdate();
}
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
}
@Override
public void release() {
try {
connection.close();
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
}
};
}
@Override
public void removeProxy(K key) {
try (Connection connection = dataSource.getConnection()) {
try(PreparedStatement removeStatement = connection.prepareStatement(removeSqlQuery)) {
primaryKeyMapper.set(removeStatement, 1, key);
removeStatement.executeUpdate();
}
} catch (SQLException e) {
throw new BucketExceptions.BucketExecutionException(e);
}
}
}