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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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39 @Plugin(name = "Rewrite", category = "Core", elementType = "appender", printObject = true)
40 public final class RewriteAppender extends AbstractAppender {
41
42 private static final long serialVersionUID = 1L;
43
44 private final Configuration config;
45 private final ConcurrentMap<String, AppenderControl> appenders = new ConcurrentHashMap<String, AppenderControl>();
46 private final RewritePolicy rewritePolicy;
47 private final AppenderRef[] appenderRefs;
48
49 private RewriteAppender(final String name, final Filter filter, final boolean ignoreExceptions,
50 final AppenderRef[] appenderRefs, final RewritePolicy rewritePolicy,
51 final Configuration config) {
52 super(name, filter, null, ignoreExceptions);
53 this.config = config;
54 this.rewritePolicy = rewritePolicy;
55 this.appenderRefs = appenderRefs;
56 }
57
58 @Override
59 public void start() {
60 for (final AppenderRef ref : appenderRefs) {
61 final String name = ref.getRef();
62 final Appender appender = config.getAppender(name);
63 if (appender != null) {
64 final Filter filter = appender instanceof AbstractAppender ?
65 ((AbstractAppender) appender).getFilter() : null;
66 appenders.put(name, new AppenderControl(appender, ref.getLevel(), filter));
67 } else {
68 LOGGER.error("Appender " + ref + " cannot be located. Reference ignored");
69 }
70 }
71 super.start();
72 }
73
74 @Override
75 public void stop() {
76 super.stop();
77 }
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83 @Override
84 public void append(LogEvent event) {
85 if (rewritePolicy != null) {
86 event = rewritePolicy.rewrite(event);
87 }
88 for (final AppenderControl control : appenders.values()) {
89 control.callAppender(event);
90 }
91 }
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104 @PluginFactory
105 public static RewriteAppender createAppender(
106 @PluginAttribute("name") final String name,
107 @PluginAttribute("ignoreExceptions") final String ignore,
108 @PluginElement("AppenderRef") final AppenderRef[] appenderRefs,
109 @PluginConfiguration final Configuration config,
110 @PluginElement("RewritePolicy") final RewritePolicy rewritePolicy,
111 @PluginElement("Filter") final Filter filter) {
112
113 final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
114 if (name == null) {
115 LOGGER.error("No name provided for RewriteAppender");
116 return null;
117 }
118 if (appenderRefs == null) {
119 LOGGER.error("No appender references defined for RewriteAppender");
120 return null;
121 }
122 return new RewriteAppender(name, filter, ignoreExceptions, appenderRefs, rewritePolicy, config);
123 }
124 }