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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
43 private final String description;
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45 private JpaAppender(final String name, final Filter filter, final boolean ignoreExceptions,
46 final JpaDatabaseManager manager) {
47 super(name, filter, ignoreExceptions, manager);
48 this.description = this.getName() + "{ manager=" + this.getManager() + " }";
49 }
50
51 @Override
52 public String toString() {
53 return this.description;
54 }
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70 @PluginFactory
71 public static JpaAppender createAppender(
72 @PluginAttribute("name") final String name,
73 @PluginAttribute("ignoreExceptions") final String ignore,
74 @PluginElement("Filter") final Filter filter,
75 @PluginAttribute("bufferSize") final String bufferSize,
76 @PluginAttribute("entityClassName") final String entityClassName,
77 @PluginAttribute("persistenceUnitName") final String persistenceUnitName) {
78 if (Strings.isEmpty(entityClassName) || Strings.isEmpty(persistenceUnitName)) {
79 LOGGER.error("Attributes entityClassName and persistenceUnitName are required for JPA Appender.");
80 return null;
81 }
82
83 final int bufferSizeInt = AbstractAppender.parseInt(bufferSize, 0);
84 final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
85
86 try {
87 final Class<? extends AbstractLogEventWrapperEntity> entityClass =
88 Loader.loadClass(entityClassName).asSubclass(AbstractLogEventWrapperEntity.class);
89
90 try {
91 entityClass.getConstructor();
92 } catch (final NoSuchMethodException e) {
93 LOGGER.error("Entity class [{}] does not have a no-arg constructor. The JPA provider will reject it.",
94 entityClassName);
95 return null;
96 }
97
98 final Constructor<? extends AbstractLogEventWrapperEntity> entityConstructor =
99 entityClass.getConstructor(LogEvent.class);
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101 final String managerName = "jpaManager{ description=" + name + ", bufferSize=" + bufferSizeInt
102 + ", persistenceUnitName=" + persistenceUnitName + ", entityClass=" + entityClass.getName() + '}';
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104 final JpaDatabaseManager manager = JpaDatabaseManager.getJPADatabaseManager(
105 managerName, bufferSizeInt, entityClass, entityConstructor, persistenceUnitName
106 );
107 if (manager == null) {
108 return null;
109 }
110
111 return new JpaAppender(name, filter, ignoreExceptions, manager);
112 } catch (final ClassNotFoundException e) {
113 LOGGER.error("Could not load entity class [{}].", entityClassName, e);
114 return null;
115 } catch (final NoSuchMethodException e) {
116 LOGGER.error("Entity class [{}] does not have a constructor with a single argument of type LogEvent.",
117 entityClassName);
118 return null;
119 } catch (final ClassCastException e) {
120 LOGGER.error("Entity class [{}] does not extend AbstractLogEventWrapperEntity.", entityClassName);
121 return null;
122 }
123 }
124 }