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TransactionallyStagedJobConfiguration.java
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TransactionallyStagedJobConfiguration.java
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/*
* Copyright (C) Gustav Karlsson
*
* <p>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
*
* <p>http://www.apache.org/licenses/LICENSE-2.0
*
* <p>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 com.github.kagkarlsson.examples.boot.config;
import com.github.kagkarlsson.examples.boot.ExampleContext;
import com.github.kagkarlsson.scheduler.task.ExecutionContext;
import com.github.kagkarlsson.scheduler.task.Task;
import com.github.kagkarlsson.scheduler.task.TaskInstance;
import com.github.kagkarlsson.scheduler.task.TaskWithoutDataDescriptor;
import com.github.kagkarlsson.scheduler.task.helper.Tasks;
import java.time.Instant;
import java.util.Random;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.TransactionStatus;
import utils.EventLogger;
@Configuration
public class TransactionallyStagedJobConfiguration {
public static final TaskWithoutDataDescriptor TRANSACTIONALLY_STAGED_TASK =
new TaskWithoutDataDescriptor("transactionally-staged-task");
private static int ID = 1;
/** Start the example */
public static void start(ExampleContext ctx) {
ctx.log(
"Scheduling a one-time task in a transaction. If the transaction rolls back, the insert of the task also "
+ "rolls back, i.e. it will never run.");
ctx.tx.executeWithoutResult(
(TransactionStatus status) -> {
// Since it is scheduled in a transaction, the scheduler will not run it until the tx
// commits
// If the tx rolls back, the insert of the new job will also roll back, i.e. not run.
ctx.schedulerClient.schedule(
TRANSACTIONALLY_STAGED_TASK.instance(String.valueOf(ID++)), Instant.now());
// Do additional database-operations here
if (new Random().nextBoolean()) {
throw new RuntimeException(
"Simulated failure happening after task was scheduled. Scheduled task will never run.");
}
});
}
/** Bean definition */
@Bean
public Task<Void> transactionallyStagedTask() {
return Tasks.oneTime(TRANSACTIONALLY_STAGED_TASK)
.execute(
(TaskInstance<Void> taskInstance, ExecutionContext executionContext) -> {
EventLogger.logTask(
TRANSACTIONALLY_STAGED_TASK,
"Ran. Will only run if transactions it was scheduled commits. ");
});
}
}