| 1 | /* |
| 2 | * Copyright 2006-2007 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.springframework.batch.core.repository.dao; |
| 18 | |
| 19 | import java.util.ArrayList; |
| 20 | import java.util.Collections; |
| 21 | import java.util.Comparator; |
| 22 | import java.util.HashSet; |
| 23 | import java.util.List; |
| 24 | import java.util.Map; |
| 25 | import java.util.Set; |
| 26 | |
| 27 | import java.util.concurrent.ConcurrentHashMap; |
| 28 | import java.util.concurrent.ConcurrentMap; |
| 29 | |
| 30 | import java.util.concurrent.atomic.AtomicLong; |
| 31 | |
| 32 | import org.springframework.batch.core.JobExecution; |
| 33 | import org.springframework.batch.core.JobInstance; |
| 34 | import org.springframework.batch.support.SerializationUtils; |
| 35 | import org.springframework.dao.OptimisticLockingFailureException; |
| 36 | import org.springframework.util.Assert; |
| 37 | |
| 38 | /** |
| 39 | * In-memory implementation of {@link JobExecutionDao}. |
| 40 | */ |
| 41 | public class MapJobExecutionDao implements JobExecutionDao { |
| 42 | |
| 43 | // JDK6 Make this into a ConcurrentSkipListMap: adds and removes tend to be very near the front or back |
| 44 | private final ConcurrentMap<Long, JobExecution> executionsById = new ConcurrentHashMap<Long, JobExecution>(); |
| 45 | |
| 46 | private final AtomicLong currentId = new AtomicLong(0L); |
| 47 | |
| 48 | public void clear() { |
| 49 | executionsById.clear(); |
| 50 | } |
| 51 | |
| 52 | private static JobExecution copy(JobExecution original) { |
| 53 | JobExecution copy = (JobExecution) SerializationUtils.deserialize(SerializationUtils.serialize(original)); |
| 54 | return copy; |
| 55 | } |
| 56 | |
| 57 | public void saveJobExecution(JobExecution jobExecution) { |
| 58 | Assert.isTrue(jobExecution.getId() == null); |
| 59 | Long newId = currentId.getAndIncrement(); |
| 60 | jobExecution.setId(newId); |
| 61 | jobExecution.incrementVersion(); |
| 62 | executionsById.put(newId, copy(jobExecution)); |
| 63 | } |
| 64 | |
| 65 | public List<JobExecution> findJobExecutions(JobInstance jobInstance) { |
| 66 | List<JobExecution> executions = new ArrayList<JobExecution>(); |
| 67 | for (JobExecution exec : executionsById.values()) { |
| 68 | if (exec.getJobInstance().equals(jobInstance)) { |
| 69 | executions.add(copy(exec)); |
| 70 | } |
| 71 | } |
| 72 | Collections.sort(executions, new Comparator<JobExecution>() { |
| 73 | |
| 74 | public int compare(JobExecution e1, JobExecution e2) { |
| 75 | long result = (e1.getId() - e2.getId()); |
| 76 | if (result > 0) { |
| 77 | return -1; |
| 78 | } |
| 79 | else if (result < 0) { |
| 80 | return 1; |
| 81 | } |
| 82 | else { |
| 83 | return 0; |
| 84 | } |
| 85 | } |
| 86 | }); |
| 87 | return executions; |
| 88 | } |
| 89 | |
| 90 | public void updateJobExecution(JobExecution jobExecution) { |
| 91 | Long id = jobExecution.getId(); |
| 92 | Assert.notNull(id, "JobExecution is expected to have an id (should be saved already)"); |
| 93 | JobExecution persistedExecution = executionsById.get(id); |
| 94 | Assert.notNull(persistedExecution, "JobExecution must already be saved"); |
| 95 | |
| 96 | synchronized (jobExecution) { |
| 97 | if (!persistedExecution.getVersion().equals(jobExecution.getVersion())) { |
| 98 | throw new OptimisticLockingFailureException("Attempt to update step execution id=" + id |
| 99 | + " with wrong version (" + jobExecution.getVersion() + "), where current version is " |
| 100 | + persistedExecution.getVersion()); |
| 101 | } |
| 102 | jobExecution.incrementVersion(); |
| 103 | executionsById.put(id, copy(jobExecution)); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | public JobExecution getLastJobExecution(JobInstance jobInstance) { |
| 108 | JobExecution lastExec = null; |
| 109 | for (JobExecution exec : executionsById.values()) { |
| 110 | if (!exec.getJobInstance().equals(jobInstance)) { |
| 111 | continue; |
| 112 | } |
| 113 | if (lastExec == null) { |
| 114 | lastExec = exec; |
| 115 | } |
| 116 | if (lastExec.getCreateTime().before(exec.getCreateTime())) { |
| 117 | lastExec = exec; |
| 118 | } |
| 119 | } |
| 120 | return copy(lastExec); |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * (non-Javadoc) |
| 125 | * |
| 126 | * @seeorg.springframework.batch.core.repository.dao.JobExecutionDao# |
| 127 | * findRunningJobExecutions(java.lang.String) |
| 128 | */ |
| 129 | public Set<JobExecution> findRunningJobExecutions(String jobName) { |
| 130 | Set<JobExecution> result = new HashSet<JobExecution>(); |
| 131 | for (JobExecution exec : executionsById.values()) { |
| 132 | if (!exec.getJobInstance().getJobName().equals(jobName) || !exec.isRunning()) { |
| 133 | continue; |
| 134 | } |
| 135 | result.add(copy(exec)); |
| 136 | } |
| 137 | return result; |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * (non-Javadoc) |
| 142 | * |
| 143 | * @see |
| 144 | * org.springframework.batch.core.repository.dao.JobExecutionDao#getJobExecution |
| 145 | * (java.lang.Long) |
| 146 | */ |
| 147 | public JobExecution getJobExecution(Long executionId) { |
| 148 | return copy(executionsById.get(executionId)); |
| 149 | } |
| 150 | |
| 151 | public void synchronizeStatus(JobExecution jobExecution) { |
| 152 | JobExecution saved = getJobExecution(jobExecution.getId()); |
| 153 | if (saved.getVersion().intValue() != jobExecution.getVersion().intValue()) { |
| 154 | jobExecution.upgradeStatus(saved.getStatus()); |
| 155 | jobExecution.setVersion(saved.getVersion()); |
| 156 | } |
| 157 | } |
| 158 | } |