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17 package org.apache.logging.log4j.core.appender.rewrite;
18
19 import java.util.Map;
20 import java.util.concurrent.ConcurrentHashMap;
21 import java.util.concurrent.ConcurrentMap;
22
23 import org.apache.logging.log4j.core.Appender;
24 import org.apache.logging.log4j.core.Filter;
25 import org.apache.logging.log4j.core.LogEvent;
26 import org.apache.logging.log4j.core.appender.AbstractAppender;
27 import org.apache.logging.log4j.core.config.AppenderControl;
28 import org.apache.logging.log4j.core.config.AppenderRef;
29 import org.apache.logging.log4j.core.config.Configuration;
30 import org.apache.logging.log4j.core.config.plugins.Plugin;
31 import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
32 import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
33 import org.apache.logging.log4j.core.config.plugins.PluginElement;
34 import org.apache.logging.log4j.core.config.plugins.PluginFactory;
35 import org.apache.logging.log4j.core.helpers.Booleans;
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39
40 @Plugin(name = "Rewrite", category = "Core", elementType = "appender", printObject = true)
41 public final class RewriteAppender extends AbstractAppender {
42 private final Configuration config;
43 private final ConcurrentMap<String, AppenderControl> appenders = new ConcurrentHashMap<String, AppenderControl>();
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 final Map<String, Appender> map = config.getAppenders();
59 for (final AppenderRef ref : appenderRefs) {
60 final String name = ref.getRef();
61 final Appender appender = map.get(name);
62 if (appender != null) {
63 final Filter filter = appender instanceof AbstractAppender ?
64 ((AbstractAppender) appender).getFilter() : null;
65 appenders.put(name, new AppenderControl(appender, ref.getLevel(), filter));
66 } else {
67 LOGGER.error("Appender " + ref + " cannot be located. Reference ignored");
68 }
69 }
70 super.start();
71 }
72
73 @Override
74 public void stop() {
75 super.stop();
76 }
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82 @Override
83 public void append(LogEvent event) {
84 if (rewritePolicy != null) {
85 event = rewritePolicy.rewrite(event);
86 }
87 for (final AppenderControl control : appenders.values()) {
88 control.callAppender(event);
89 }
90 }
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103 @PluginFactory
104 public static RewriteAppender createAppender(
105 @PluginAttribute("name") final String name,
106 @PluginAttribute("ignoreExceptions") final String ignore,
107 @PluginElement("AppenderRef") final AppenderRef[] appenderRefs,
108 @PluginConfiguration final Configuration config,
109 @PluginElement("RewritePolicy") final RewritePolicy rewritePolicy,
110 @PluginElement("Filter") final Filter filter) {
111
112 final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
113 if (name == null) {
114 LOGGER.error("No name provided for RewriteAppender");
115 return null;
116 }
117 if (appenderRefs == null) {
118 LOGGER.error("No appender references defined for RewriteAppender");
119 return null;
120 }
121 return new RewriteAppender(name, filter, ignoreExceptions, appenderRefs, rewritePolicy, config);
122 }
123 }