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rewrite distributed lock & fixed doc
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93 changes: 93 additions & 0 deletions
93
paimon-core/src/main/java/org/apache/paimon/jdbc/AbstractDistributedLockDialect.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 org.apache.paimon.jdbc; | ||
|
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| import java.sql.DatabaseMetaData; | ||
| import java.sql.PreparedStatement; | ||
| import java.sql.ResultSet; | ||
| import java.sql.SQLException; | ||
|
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| /** Jdbc distributed lock interface. */ | ||
| public abstract class AbstractDistributedLockDialect implements JdbcDistributedLockDialect { | ||
|
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| @Override | ||
| public void createTable(JdbcClientPool connections) throws SQLException, InterruptedException { | ||
| connections.run( | ||
| conn -> { | ||
| DatabaseMetaData dbMeta = conn.getMetaData(); | ||
| ResultSet tableExists = | ||
| dbMeta.getTables( | ||
| null, null, JdbcUtils.DISTRIBUTED_LOCKS_TABLE_NAME, null); | ||
| if (tableExists.next()) { | ||
| return true; | ||
| } | ||
| return conn.prepareStatement(getCreateTableSql()).execute(); | ||
| }); | ||
| } | ||
|
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| public abstract String getCreateTableSql(); | ||
|
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| @Override | ||
| public boolean lockAcquire(JdbcClientPool connections, String lockId, long timeoutMillSeconds) | ||
| throws SQLException, InterruptedException { | ||
| return connections.run( | ||
| connection -> { | ||
| try (PreparedStatement preparedStatement = | ||
| connection.prepareStatement(getLockAcquireSql())) { | ||
| preparedStatement.setString(1, lockId); | ||
| preparedStatement.setLong(2, timeoutMillSeconds / 1000); | ||
| return preparedStatement.executeUpdate() > 0; | ||
| } catch (SQLException ex) { | ||
| return false; | ||
| } | ||
| }); | ||
| } | ||
|
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| public abstract String getLockAcquireSql(); | ||
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| @Override | ||
| public boolean releaseLock(JdbcClientPool connections, String lockId) | ||
| throws SQLException, InterruptedException { | ||
| return connections.run( | ||
| connection -> { | ||
| try (PreparedStatement preparedStatement = | ||
| connection.prepareStatement(getReleaseLockSql())) { | ||
| preparedStatement.setString(1, lockId); | ||
| return preparedStatement.executeUpdate() > 0; | ||
| } | ||
| }); | ||
| } | ||
|
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| public abstract String getReleaseLockSql(); | ||
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| @Override | ||
| public int tryReleaseTimedOutLock(JdbcClientPool connections, String lockId) | ||
| throws SQLException, InterruptedException { | ||
| return connections.run( | ||
| connection -> { | ||
| try (PreparedStatement preparedStatement = | ||
| connection.prepareStatement(getTryReleaseTimedOutLock())) { | ||
| preparedStatement.setString(1, lockId); | ||
| return preparedStatement.executeUpdate(); | ||
| } | ||
| }); | ||
| } | ||
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| public abstract String getTryReleaseTimedOutLock(); | ||
| } |
42 changes: 42 additions & 0 deletions
42
paimon-core/src/main/java/org/apache/paimon/jdbc/DistributedLockDialectFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
|
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| package org.apache.paimon.jdbc; | ||
|
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| class DistributedLockDialectFactory { | ||
| static JdbcDistributedLockDialect create(String protocol) { | ||
| JdbcProtocol type = JdbcProtocol.valueOf(protocol.toUpperCase()); | ||
| switch (type) { | ||
| case SQLITE: | ||
| return new SqlLiteDistributedLockDialect(); | ||
| case MYSQL: | ||
| return new MysqlDistributedLockDialect(); | ||
| default: | ||
| throw new UnsupportedOperationException( | ||
| String.format("Distributed locks based on %s are not supported", protocol)); | ||
| } | ||
| } | ||
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| /** Supported jdbc protocol. */ | ||
| enum JdbcProtocol { | ||
| SQLITE, | ||
| // for mysql. | ||
| MARIADB, | ||
| MYSQL; | ||
| } | ||
| } |
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