/*
* Copyright 2006-2014 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 org.springframework.batch.core.repository.dao;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.batch.core.Entity;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.StepExecution;
import org.springframework.dao.OptimisticLockingFailureException;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.SerializationUtils;
/**
* In-memory implementation of {@link StepExecutionDao}.
*/
public class MapStepExecutionDao implements StepExecutionDao {
private Map<Long, Map<Long, StepExecution>> executionsByJobExecutionId = new ConcurrentHashMap<Long, Map<Long,StepExecution>>();
private Map<Long, StepExecution> executionsByStepExecutionId = new ConcurrentHashMap<Long, StepExecution>();
private AtomicLong currentId = new AtomicLong();
public void clear() {
executionsByJobExecutionId.clear();
executionsByStepExecutionId.clear();
}
private static StepExecution copy(StepExecution original) {
return (StepExecution) SerializationUtils.deserialize(SerializationUtils.serialize(original));
}
private static void copy(final StepExecution sourceExecution, final StepExecution targetExecution) {
// Cheaper than full serialization is a reflective field copy, which is
// fine for volatile storage
ReflectionUtils.doWithFields(StepExecution.class, new ReflectionUtils.FieldCallback() {
@Override
public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
field.setAccessible(true);
field.set(targetExecution, field.get(sourceExecution));
}
}, ReflectionUtils.COPYABLE_FIELDS);
}
@Override
public void saveStepExecution(StepExecution stepExecution) {
Assert.isTrue(stepExecution.getId() == null, "stepExecution id was not null");
Assert.isTrue(stepExecution.getVersion() == null, "stepExecution version was not null");
Assert.notNull(stepExecution.getJobExecutionId(), "JobExecution must be saved already.");
Map<Long, StepExecution> executions = executionsByJobExecutionId.get(stepExecution.getJobExecutionId());
if (executions == null) {
executions = new ConcurrentHashMap<Long, StepExecution>();
executionsByJobExecutionId.put(stepExecution.getJobExecutionId(), executions);
}
stepExecution.setId(currentId.incrementAndGet());
stepExecution.incrementVersion();
StepExecution copy = copy(stepExecution);
executions.put(stepExecution.getId(), copy);
executionsByStepExecutionId.put(stepExecution.getId(), copy);
}
@Override
public void updateStepExecution(StepExecution stepExecution) {
Assert.notNull(stepExecution.getJobExecutionId(), "jobExecution id is null");
Map<Long, StepExecution> executions = executionsByJobExecutionId.get(stepExecution.getJobExecutionId());
Assert.notNull(executions, "step executions for given job execution are expected to be already saved");
final StepExecution persistedExecution = executionsByStepExecutionId.get(stepExecution.getId());
Assert.notNull(persistedExecution, "step execution is expected to be already saved");
synchronized (stepExecution) {
if (!persistedExecution.getVersion().equals(stepExecution.getVersion())) {
throw new OptimisticLockingFailureException("Attempt to update step execution id="
+ stepExecution.getId() + " with wrong version (" + stepExecution.getVersion()
+ "), where current version is " + persistedExecution.getVersion());
}
stepExecution.incrementVersion();
StepExecution copy = new StepExecution(stepExecution.getStepName(), stepExecution.getJobExecution());
copy(stepExecution, copy);
executions.put(stepExecution.getId(), copy);
executionsByStepExecutionId.put(stepExecution.getId(), copy);
}
}
@Override
public StepExecution getStepExecution(JobExecution jobExecution, Long stepExecutionId) {
return executionsByStepExecutionId.get(stepExecutionId);
}
@Override
public void addStepExecutions(JobExecution jobExecution) {
Map<Long, StepExecution> executions = executionsByJobExecutionId.get(jobExecution.getId());
if (executions == null || executions.isEmpty()) {
return;
}
List<StepExecution> result = new ArrayList<StepExecution>(executions.values());
Collections.sort(result, new Comparator<Entity>() {
@Override
public int compare(Entity o1, Entity o2) {
return Long.signum(o2.getId() - o1.getId());
}
});
List<StepExecution> copy = new ArrayList<StepExecution>(result.size());
for (StepExecution exec : result) {
copy.add(copy(exec));
}
jobExecution.addStepExecutions(copy);
}
@Override
public void saveStepExecutions(Collection<StepExecution> stepExecutions) {
Assert.notNull(stepExecutions,"Attempt to save an null collect of step executions");
for (StepExecution stepExecution: stepExecutions) {
saveStepExecution(stepExecution);
}
}
}