spring-batch MapStepRegistry 源码
spring-batch MapStepRegistry 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/support/MapStepRegistry.java
/*
* Copyright 2012-2022 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.configuration.support;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.DuplicateJobException;
import org.springframework.batch.core.configuration.StepRegistry;
import org.springframework.batch.core.launch.NoSuchJobException;
import org.springframework.batch.core.step.NoSuchStepException;
import org.springframework.util.Assert;
/**
* Simple map-based implementation of {@link StepRegistry}. Access to the map is
* synchronized and guarded by an internal lock.
*
* @author Sebastien Gerard
* @author Stephane Nicoll
*/
public class MapStepRegistry implements StepRegistry {
private final ConcurrentMap<String, Map<String, Step>> map = new ConcurrentHashMap<>();
@Override
public void register(String jobName, Collection<Step> steps) throws DuplicateJobException {
Assert.notNull(jobName, "The job name cannot be null.");
Assert.notNull(steps, "The job steps cannot be null.");
final Map<String, Step> jobSteps = new HashMap<>();
for (Step step : steps) {
jobSteps.put(step.getName(), step);
}
final Object previousValue = map.putIfAbsent(jobName, jobSteps);
if (previousValue != null) {
throw new DuplicateJobException(
"A job configuration with this name [" + jobName + "] was already registered");
}
}
@Override
public void unregisterStepsFromJob(String jobName) {
Assert.notNull(jobName, "Job configuration must have a name.");
map.remove(jobName);
}
@Override
public Step getStep(String jobName, String stepName) throws NoSuchJobException {
Assert.notNull(jobName, "The job name cannot be null.");
Assert.notNull(stepName, "The step name cannot be null.");
if (!map.containsKey(jobName)) {
throw new NoSuchJobException("No job configuration with the name [" + jobName + "] was registered");
}
else {
final Map<String, Step> jobSteps = map.get(jobName);
if (jobSteps.containsKey(stepName)) {
return jobSteps.get(stepName);
}
else {
throw new NoSuchStepException(
"The step called [" + stepName + "] does not exist in the job [" + jobName + "]");
}
}
}
}
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