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17 package org.apache.logging.log4j.core.appender.db;
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19 import java.util.concurrent.locks.Lock;
20 import java.util.concurrent.locks.ReadWriteLock;
21 import java.util.concurrent.locks.ReentrantReadWriteLock;
22
23 import org.apache.logging.log4j.LoggingException;
24 import org.apache.logging.log4j.core.Filter;
25 import org.apache.logging.log4j.core.Layout;
26 import org.apache.logging.log4j.core.LogEvent;
27 import org.apache.logging.log4j.core.appender.AbstractAppender;
28 import org.apache.logging.log4j.core.appender.AppenderLoggingException;
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38 public abstract class AbstractDatabaseAppender<T extends AbstractDatabaseManager> extends AbstractAppender {
39 private static final long serialVersionUID = 1L;
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41 private final ReadWriteLock lock = new ReentrantReadWriteLock();
42 private final Lock readLock = lock.readLock();
43 private final Lock writeLock = lock.writeLock();
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45 private T manager;
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56 protected AbstractDatabaseAppender(final String name, final Filter filter, final boolean ignoreExceptions,
57 final T manager) {
58 super(name, filter, null, ignoreExceptions);
59 this.manager = manager;
60 }
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68 @Override
69 public final Layout<LogEvent> getLayout() {
70 return null;
71 }
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78 public final T getManager() {
79 return this.manager;
80 }
81
82 @Override
83 public final void start() {
84 if (this.getManager() == null) {
85 LOGGER.error("No AbstractDatabaseManager set for the appender named [{}].", this.getName());
86 }
87 super.start();
88 if (this.getManager() != null) {
89 this.getManager().startup();
90 }
91 }
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93 @Override
94 public final void stop() {
95 super.stop();
96 if (this.getManager() != null) {
97 this.getManager().release();
98 }
99 }
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101 @Override
102 public final void append(final LogEvent event) {
103 this.readLock.lock();
104 try {
105 this.getManager().write(event);
106 } catch (final LoggingException e) {
107 LOGGER.error("Unable to write to database [{}] for appender [{}].", this.getManager().getName(),
108 this.getName(), e);
109 throw e;
110 } catch (final Exception e) {
111 LOGGER.error("Unable to write to database [{}] for appender [{}].", this.getManager().getName(),
112 this.getName(), e);
113 throw new AppenderLoggingException("Unable to write to database in appender: " + e.getMessage(), e);
114 } finally {
115 this.readLock.unlock();
116 }
117 }
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126 protected final void replaceManager(final T manager) {
127 this.writeLock.lock();
128 try {
129 final T old = this.getManager();
130 if (!manager.isRunning()) {
131 manager.startup();
132 }
133 this.manager = manager;
134 old.release();
135 } finally {
136 this.writeLock.unlock();
137 }
138 }
139 }