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17 package org.apache.logging.log4j.core.appender.rewrite;
18
19 import java.util.concurrent.ConcurrentHashMap;
20 import java.util.concurrent.ConcurrentMap;
21
22 import org.apache.logging.log4j.core.Appender;
23 import org.apache.logging.log4j.core.Filter;
24 import org.apache.logging.log4j.core.LogEvent;
25 import org.apache.logging.log4j.core.appender.AbstractAppender;
26 import org.apache.logging.log4j.core.config.AppenderControl;
27 import org.apache.logging.log4j.core.config.AppenderRef;
28 import org.apache.logging.log4j.core.config.Configuration;
29 import org.apache.logging.log4j.core.config.plugins.Plugin;
30 import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
31 import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
32 import org.apache.logging.log4j.core.config.plugins.PluginElement;
33 import org.apache.logging.log4j.core.config.plugins.PluginFactory;
34 import org.apache.logging.log4j.core.util.Booleans;
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38
39 @Plugin(name = "Rewrite", category = "Core", elementType = "appender", printObject = true)
40 public final class RewriteAppender extends AbstractAppender {
41
42 private final Configuration config;
43 private final ConcurrentMap<String, AppenderControl> appenders = new ConcurrentHashMap<>();
44 private final RewritePolicy rewritePolicy;
45 private final AppenderRef[] appenderRefs;
46
47 private RewriteAppender(final String name, final Filter filter, final boolean ignoreExceptions,
48 final AppenderRef[] appenderRefs, final RewritePolicy rewritePolicy,
49 final Configuration config) {
50 super(name, filter, null, ignoreExceptions);
51 this.config = config;
52 this.rewritePolicy = rewritePolicy;
53 this.appenderRefs = appenderRefs;
54 }
55
56 @Override
57 public void start() {
58 for (final AppenderRef ref : appenderRefs) {
59 final String name = ref.getRef();
60 final Appender appender = config.getAppender(name);
61 if (appender != null) {
62 final Filter filter = appender instanceof AbstractAppender ?
63 ((AbstractAppender) appender).getFilter() : null;
64 appenders.put(name, new AppenderControl(appender, ref.getLevel(), filter));
65 } else {
66 LOGGER.error("Appender " + ref + " cannot be located. Reference ignored");
67 }
68 }
69 super.start();
70 }
71
72 @Override
73 public void stop() {
74 super.stop();
75 }
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81 @Override
82 public void append(LogEvent event) {
83 if (rewritePolicy != null) {
84 event = rewritePolicy.rewrite(event);
85 }
86 for (final AppenderControl control : appenders.values()) {
87 control.callAppender(event);
88 }
89 }
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102 @PluginFactory
103 public static RewriteAppender createAppender(
104 @PluginAttribute("name") final String name,
105 @PluginAttribute("ignoreExceptions") final String ignore,
106 @PluginElement("AppenderRef") final AppenderRef[] appenderRefs,
107 @PluginConfiguration final Configuration config,
108 @PluginElement("RewritePolicy") final RewritePolicy rewritePolicy,
109 @PluginElement("Filter") final Filter filter) {
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111 final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
112 if (name == null) {
113 LOGGER.error("No name provided for RewriteAppender");
114 return null;
115 }
116 if (appenderRefs == null) {
117 LOGGER.error("No appender references defined for RewriteAppender");
118 return null;
119 }
120 return new RewriteAppender(name, filter, ignoreExceptions, appenderRefs, rewritePolicy, config);
121 }
122 }