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24 package org.riotfamily.revolt;
25
26 import java.util.ArrayList  ;
27 import java.util.Iterator ;
28 import java.util.List ;
29
30 import javax.sql.DataSource ;
31
32 import org.apache.commons.logging.Log;
33 import org.apache.commons.logging.LogFactory;
34 import org.riotfamily.revolt.definition.Database;
35 import org.riotfamily.revolt.support.DatabaseUtils;
36 import org.riotfamily.revolt.support.DialectResolver;
37 import org.riotfamily.revolt.support.LogTable;
38 import org.riotfamily.revolt.support.ScriptBuilder;
39 import org.springframework.beans.factory.BeanNameAware;
40
41
45 public class EvolutionHistory implements BeanNameAware {
46
47 private static final Log log = LogFactory.getLog(EvolutionHistory.class);
48
49 private String moduleName;
50
51 private List changeSets;
52
53 private DataSource dataSource;
54
55 private Dialect dialect;
56
57 private LogTable logTable;
58
59 private ArrayList appliedIds;
60
61 private boolean newModule;
62
63 public EvolutionHistory(DataSource dataSource) {
64 this.dataSource = dataSource;
65 this.dialect = new DialectResolver().getDialect(dataSource);
66 }
67
68 public DataSource getDataSource() {
69 return this.dataSource;
70 }
71
72 public Dialect getDialect() {
73 return this.dialect;
74 }
75
76 public void setBeanName(String name) {
77 this.moduleName = name;
78 }
79
80 public String getModuleName() {
81 return this.moduleName;
82 }
83
84 public void setChangeSets(ChangeSet[] changeSets) {
85 this.changeSets = new ArrayList ();
86 for (int i = 0; i < changeSets.length; i++) {
87 ChangeSet changeSet = changeSets[i];
88 changeSet.setHistory(this);
89 changeSet.setSequenceNumber(i);
90 this.changeSets.add(changeSet);
91 }
92 }
93
94 public void validate() {
95 DatabaseUtils.validate(dataSource, evolveModel());
96 }
97
98 private Database evolveModel() {
99 Database model = new Database();
100 Iterator it = changeSets.iterator();
101 while (it.hasNext()) {
102 ChangeSet changeSet = (ChangeSet) it.next();
103 changeSet.alterModel(model);
104 }
105 return model;
106 }
107
108
111 public void init(LogTable logTable) {
112 this.logTable = logTable;
113 appliedIds = new ArrayList ();
114 appliedIds.addAll(logTable.getAppliedChangeSetIds(moduleName));
115 }
116
117
120 public Script getScript() {
121 if (appliedIds.isEmpty()) {
122 log.info("The log-table contains no entries for module '"
123 + moduleName + "'. Checking if schema is up-to-date ...");
124
125 newModule = true;
126 return getEvolvedSetupScript();
127 }
128 else {
129 return getMigrationScript();
130 }
131 }
132
133 private Script getEvolvedSetupScript() {
134 Script script = new Script();
135 Database model = evolveModel();
136 try {
137 DatabaseUtils.validate(dataSource, model);
138 log.info("Schema looks okay. Marking all changes as applied.");
139 }
140 catch (DatabaseOutOfSyncException e) {
141 log.info(e.getMessage());
142 log.info("Generating setup script ...");
143 ScriptBuilder builder = new ScriptBuilder(model, dialect);
144 script.append(builder.buildScript());
145 }
146 Iterator it = changeSets.iterator();
147 while (it.hasNext()) {
148 ChangeSet changeSet = (ChangeSet) it.next();
149 script.append(markAsApplied(changeSet));
150 }
151 return script;
152 }
153
154 private Script getMigrationScript() {
155 Script script = new Script();
156 Iterator it = changeSets.iterator();
157 while (it.hasNext()) {
158 ChangeSet changeSet = (ChangeSet) it.next();
159 if (!isApplied(changeSet)) {
160 script.append(changeSet.getScript(dialect));
161 script.append(markAsApplied(changeSet));
162 }
163 }
164 return script;
165 }
166
167
171 public boolean isNewModule() {
172 return newModule;
173 }
174
175
180 private boolean isApplied(ChangeSet changeSet) {
181 if (appliedIds.size() > changeSet.getSequenceNumber()) {
182 String appliedId = (String ) appliedIds.get(
183 changeSet.getSequenceNumber());
184
185 if (appliedId.equals(changeSet.getId())) {
186 return true;
187 }
188 throw new DatabaseOutOfSyncException("ChangeSet number "
189 + changeSet.getSequenceNumber() + " should be ["
190 + changeSet.getId() + "] but is [" + appliedId + "]");
191 }
192 return false;
193 }
194
195
201 private Script markAsApplied(ChangeSet changeSet) {
202 if (changeSet.getSequenceNumber() != appliedIds.size()) {
203 throw new DatabaseOutOfSyncException("ChangeSet ["
204 + changeSet.getId() + "] is number "
205 + changeSet.getSequenceNumber() + " but there are already "
206 + appliedIds.size() + " ChangeSets applied!");
207 }
208 appliedIds.add(changeSet.getId());
209 return logTable.getInsertScript(changeSet);
210 }
211
212 }
213
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