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1
24 package org.riotfamily.revolt;
25
26 import java.util.Collection  ;
27 import java.util.HashMap ;
28 import java.util.Iterator ;
29 import java.util.Map ;
30
31 import javax.sql.DataSource ;
32
33 import org.apache.commons.logging.Log;
34 import org.apache.commons.logging.LogFactory;
35 import org.riotfamily.revolt.support.DatabaseUtils;
36 import org.riotfamily.revolt.support.LogTable;
37 import org.springframework.beans.factory.BeanFactoryUtils;
38 import org.springframework.context.ApplicationContext;
39 import org.springframework.context.ApplicationContextAware;
40 import org.springframework.util.StringUtils;
41
42
45 public class Evolver implements ApplicationContextAware {
46
47 private static final Log log = LogFactory.getLog(Evolver.class);
48
49 private boolean enabled = true;
50
51 private boolean automatic;
52
53 private HashMap scripts = new HashMap ();
54
55 private HashMap logTables = new HashMap ();
56
57
60 public void setAutomatic(boolean automatic) {
61 this.automatic = automatic;
62 }
63
64
68 public void setEnabled(boolean enabled) {
69 this.enabled = enabled;
70 }
71
72 public void setApplicationContext(ApplicationContext applicationContext) {
73 Collection evolutions = BeanFactoryUtils.beansOfTypeIncludingAncestors(
74 applicationContext, EvolutionHistory.class).values();
75
76 if (enabled) {
77 Iterator it = evolutions.iterator();
78
79 while (it.hasNext()) {
80 EvolutionHistory history = (EvolutionHistory) it.next();
81 history.init(getLogTable(history));
82 getScript(history).append(history.getScript());
83 }
84
85 if (automatic) {
86 executeScripts();
87 }
88
89 String instructions = getInstructions();
90 if (StringUtils.hasLength(instructions)) {
91 throw new EvolutionInstructions(instructions);
92 }
93
94 while (it.hasNext()) {
95 EvolutionHistory history = (EvolutionHistory) it.next();
96 history.validate();
97 }
98 }
99 }
100
101 private LogTable getLogTable(EvolutionHistory history) {
102 DataSource dataSource = history.getDataSource();
103 LogTable logTable = (LogTable) logTables.get(dataSource);
104 if (logTable == null) {
105 logTable = new LogTable(dataSource, history.getDialect());
106 logTables.put(history.getDataSource(), logTable);
107 if (!logTable.exists()) {
108 log.info("Revolt log-table does not exist.");
109 getScript(history).append(logTable.getCreateTableScript());
110 }
111 }
112 return logTable;
113 }
114
115 private Script getScript(EvolutionHistory history) {
116 DataSource dataSource = history.getDataSource();
117 Script script = (Script) scripts.get(dataSource);
118 if (script == null) {
119 script = new Script();
120 scripts.put(dataSource, script);
121 }
122 return script;
123 }
124
125 private void executeScripts() {
126 Iterator it = scripts.entrySet().iterator();
127 while (it.hasNext()) {
128 Map.Entry entry = (Map.Entry ) it.next();
129 DataSource dataSource = (DataSource ) entry.getKey();
130 Script script = (Script) entry.getValue();
131 if (!script.isManualExecutionOnly()) {
132 script.execute(dataSource);
133 }
134 }
135 }
136
137 private String getInstructions() {
138 StringBuffer sb = new StringBuffer ();
139 Iterator it = scripts.entrySet().iterator();
140 while (it.hasNext()) {
141 Map.Entry entry = (Map.Entry ) it.next();
142 DataSource dataSource = (DataSource ) entry.getKey();
143 Script script = (Script) entry.getValue();
144 if (!automatic || script.isManualExecutionOnly()) {
145 String sql = script.getSql();
146 if (StringUtils.hasLength(sql)) {
147 sb.append("\n\n-------------------------------------------------------------------------\n\n");
148 sb.append("The database ").append(DatabaseUtils.getUrl(dataSource));
149 sb.append(" is not up-to-date.\nPlease execute the"
150 + " following SQL commands to evolve the schema:\n\n");
151
152 sb.append(sql);
153 sb.append("\n\n-------------------------------------------------------------------------\n\n");
154 }
155 }
156 }
157 return sb.toString();
158 }
159
160 }
161
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