net.javacrumbs.shedlock.provider.r2dbc.R2dbcLockProvider Maven / Gradle / Ivy
/*
* Copyright 2009 the original author or authors.
*
* 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 net.javacrumbs.shedlock.provider.r2dbc;
import io.r2dbc.spi.ConnectionFactory;
import net.javacrumbs.shedlock.support.StorageBasedLockProvider;
import net.javacrumbs.shedlock.support.annotation.NonNull;
/**
* Lock provided by plain R2DBC SPI. It uses a table that contains lock_name and
* locked_until.
*
*
* - Attempts to insert a new lock record. Since lock name is a primary key,
* it fails if the record already exists. As an optimization, we keep in-memory
* track of created lock records.
*
- If the insert succeeds (1 inserted row) we have the lock.
*
- If the insert failed due to duplicate key or we have skipped the
* insertion, we will try to update lock record using UPDATE tableName SET
* lock_until = :lockUntil WHERE name = :lockName AND lock_until <= :now
*
- If the update succeeded (1 updated row), we have the lock. If the update
* failed (0 updated rows) somebody else holds the lock
*
- When unlocking, lock_until is set to now.
*
*/
public class R2dbcLockProvider extends StorageBasedLockProvider {
public R2dbcLockProvider(@NonNull ConnectionFactory connectionFactory) {
this(connectionFactory, "shedlock");
}
public R2dbcLockProvider(@NonNull ConnectionFactory connectionFactory, @NonNull String tableName) {
super(new R2dbcStorageAccessor(connectionFactory, tableName));
}
}