spring-batch RunIdIncrementer 源码
spring-batch RunIdIncrementer 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/RunIdIncrementer.java
/*
* Copyright 2006-2020 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
*
* https://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.springframework.batch.core.launch.support;
import org.springframework.batch.core.JobParameter;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.JobParametersBuilder;
import org.springframework.batch.core.JobParametersIncrementer;
import org.springframework.lang.Nullable;
/**
* This incrementer increments a "run.id" parameter of type {@link Long} from the given
* job parameters. If the parameter does not exist, it will be initialized to 1. The
* parameter name can be configured using {@link #setKey(String)}.
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
*/
public class RunIdIncrementer implements JobParametersIncrementer {
private static String RUN_ID_KEY = "run.id";
private String key = RUN_ID_KEY;
/**
* The name of the run id in the job parameters. Defaults to "run.id".
* @param key the key to set
*/
public void setKey(String key) {
this.key = key;
}
/**
* Increment the run.id parameter (starting with 1).
* @param parameters the previous job parameters
* @return the next job parameters with an incremented (or initialized) run.id
* @throws IllegalArgumentException if the previous value of run.id is invalid
*/
@Override
public JobParameters getNext(@Nullable JobParameters parameters) {
JobParameters params = (parameters == null) ? new JobParameters() : parameters;
JobParameter runIdParameter = params.getParameters().get(this.key);
long id = 1;
if (runIdParameter != null) {
try {
id = Long.parseLong(runIdParameter.getValue().toString()) + 1;
}
catch (NumberFormatException exception) {
throw new IllegalArgumentException("Invalid value for parameter " + this.key, exception);
}
}
return new JobParametersBuilder(params).addLong(this.key, id).toJobParameters();
}
}
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