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17 package org.apache.logging.log4j.core.appender.db.jpa;
18
19 import java.lang.reflect.Constructor;
20
21 import org.apache.logging.log4j.core.Filter;
22 import org.apache.logging.log4j.core.LogEvent;
23 import org.apache.logging.log4j.core.appender.AbstractAppender;
24 import org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender;
25 import org.apache.logging.log4j.core.config.plugins.Plugin;
26 import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
27 import org.apache.logging.log4j.core.config.plugins.PluginElement;
28 import org.apache.logging.log4j.core.config.plugins.PluginFactory;
29 import org.apache.logging.log4j.core.util.Booleans;
30 import org.apache.logging.log4j.core.util.Loader;
31 import org.apache.logging.log4j.util.Strings;
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40 @Plugin(name = "JPA", category = "Core", elementType = "appender", printObject = true)
41 public final class JpaAppender extends AbstractDatabaseAppender<JpaDatabaseManager> {
42 private final String description;
43
44 private JpaAppender(final String name, final Filter filter, final boolean ignoreExceptions,
45 final JpaDatabaseManager manager) {
46 super(name, filter, ignoreExceptions, manager);
47 this.description = this.getName() + "{ manager=" + this.getManager() + " }";
48 }
49
50 @Override
51 public String toString() {
52 return this.description;
53 }
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69 @PluginFactory
70 public static JpaAppender createAppender(
71 @PluginAttribute("name") final String name,
72 @PluginAttribute("ignoreExceptions") final String ignore,
73 @PluginElement("Filter") final Filter filter,
74 @PluginAttribute("bufferSize") final String bufferSize,
75 @PluginAttribute("entityClassName") final String entityClassName,
76 @PluginAttribute("persistenceUnitName") final String persistenceUnitName) {
77 if (Strings.isEmpty(entityClassName) || Strings.isEmpty(persistenceUnitName)) {
78 LOGGER.error("Attributes entityClassName and persistenceUnitName are required for JPA Appender.");
79 return null;
80 }
81
82 final int bufferSizeInt = AbstractAppender.parseInt(bufferSize, 0);
83 final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
84
85 try {
86 @SuppressWarnings("unchecked")
87 final Class<? extends AbstractLogEventWrapperEntity> entityClass =
88 (Class<? extends AbstractLogEventWrapperEntity>) Loader.loadClass(entityClassName);
89
90 if (!AbstractLogEventWrapperEntity.class.isAssignableFrom(entityClass)) {
91 LOGGER.error("Entity class [{}] does not extend AbstractLogEventWrapperEntity.", entityClassName);
92 return null;
93 }
94
95 try {
96 entityClass.getConstructor();
97 } catch (final NoSuchMethodException e) {
98 LOGGER.error("Entity class [{}] does not have a no-arg constructor. The JPA provider will reject it.",
99 entityClassName);
100 return null;
101 }
102
103 final Constructor<? extends AbstractLogEventWrapperEntity> entityConstructor =
104 entityClass.getConstructor(LogEvent.class);
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106 final String managerName = "jpaManager{ description=" + name + ", bufferSize=" + bufferSizeInt
107 + ", persistenceUnitName=" + persistenceUnitName + ", entityClass=" + entityClass.getName() + '}';
108
109 final JpaDatabaseManager manager = JpaDatabaseManager.getJPADatabaseManager(
110 managerName, bufferSizeInt, entityClass, entityConstructor, persistenceUnitName
111 );
112 if (manager == null) {
113 return null;
114 }
115
116 return new JpaAppender(name, filter, ignoreExceptions, manager);
117 } catch (final ClassNotFoundException e) {
118 LOGGER.error("Could not load entity class [{}].", entityClassName, e);
119 return null;
120 } catch (final NoSuchMethodException e) {
121 LOGGER.error("Entity class [{}] does not have a constructor with a single argument of type LogEvent.",
122 entityClassName);
123 return null;
124 }
125 }
126 }