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17 package org.apache.logging.log4j.core.appender.rewrite;
18
19 import org.apache.logging.log4j.core.Appender;
20 import org.apache.logging.log4j.core.Filter;
21 import org.apache.logging.log4j.core.LogEvent;
22 import org.apache.logging.log4j.core.appender.AbstractAppender;
23 import org.apache.logging.log4j.core.config.AppenderControl;
24 import org.apache.logging.log4j.core.config.AppenderRef;
25 import org.apache.logging.log4j.core.config.Configuration;
26 import org.apache.logging.log4j.core.config.plugins.Plugin;
27 import org.apache.logging.log4j.core.config.plugins.PluginAttr;
28 import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
29 import org.apache.logging.log4j.core.config.plugins.PluginElement;
30 import org.apache.logging.log4j.core.config.plugins.PluginFactory;
31
32 import java.io.Serializable;
33 import java.util.Map;
34 import java.util.concurrent.ConcurrentHashMap;
35 import java.util.concurrent.ConcurrentMap;
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39
40 @Plugin(name = "Rewrite", category = "Core", elementType = "appender", printObject = true)
41 public final class RewriteAppender<T extends Serializable> extends AbstractAppender<T> {
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 handleException,
48 final AppenderRef[] appenderRefs, final RewritePolicy rewritePolicy,
49 final Configuration config) {
50 super(name, filter, null, handleException);
51 this.config = config;
52 this.rewritePolicy = rewritePolicy;
53 this.appenderRefs = appenderRefs;
54 }
55
56 @Override
57 @SuppressWarnings("unchecked")
58 public void start() {
59 final Map<String, Appender<?>> map = config.getAppenders();
60 for (final AppenderRef ref : appenderRefs) {
61 final String name = ref.getRef();
62 final Appender appender = map.get(name);
63 if (appender != null) {
64 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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103 @PluginFactory
104 public static <S extends Serializable> RewriteAppender<S> createAppender(@PluginAttr("name") final String name,
105 @PluginAttr("suppressExceptions") final String suppress,
106 @PluginElement("appender-ref") final AppenderRef[] appenderRefs,
107 @PluginConfiguration final Configuration config,
108 @PluginElement("rewritePolicy") final RewritePolicy rewritePolicy,
109 @PluginElement("filter") final Filter filter) {
110
111 final boolean handleExceptions = suppress == null ? true : Boolean.valueOf(suppress);
112
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<S>(name, filter, handleExceptions, appenderRefs, rewritePolicy, config);
122 }
123 }