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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.util.Map;
33 import java.util.concurrent.ConcurrentHashMap;
34 import java.util.concurrent.ConcurrentMap;
35
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38
39 @Plugin(name = "Rewrite", type = "Core", elementType = "appender", printObject = true)
40 public final class RewriteAppender extends AbstractAppender {
41 private final Configuration config;
42 private final ConcurrentMap<String, AppenderControl> appenders = new ConcurrentHashMap<String, AppenderControl>();
43 private final RewritePolicy rewritePolicy;
44 private final AppenderRef[] appenderRefs;
45
46 private RewriteAppender(final String name, final Filter filter, final boolean handleException,
47 final AppenderRef[] appenderRefs, final RewritePolicy rewritePolicy,
48 final Configuration config) {
49 super(name, filter, null, handleException);
50 this.config = config;
51 this.rewritePolicy = rewritePolicy;
52 this.appenderRefs = appenderRefs;
53 }
54
55 @Override
56 public void start() {
57 final Map<String, Appender<?>> map = config.getAppenders();
58 for (final AppenderRef ref : appenderRefs) {
59 final String name = ref.getRef();
60 final Appender appender = map.get(name);
61 if (appender != null) {
62 appenders.put(name, new AppenderControl(appender, ref.getLevel(), null));
63 } else {
64 LOGGER.error("Appender " + ref + " cannot be located. Reference ignored");
65 }
66 }
67 super.start();
68 }
69
70 @Override
71 public void stop() {
72 super.stop();
73 }
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79 public void append(LogEvent event) {
80 if (rewritePolicy != null) {
81 event = rewritePolicy.rewrite(event);
82 }
83 for (final AppenderControl control : appenders.values()) {
84 control.callAppender(event);
85 }
86 }
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98 @PluginFactory
99 public static RewriteAppender createAppender(@PluginAttr("name") final String name,
100 @PluginAttr("suppressExceptions") final String suppress,
101 @PluginElement("appender-ref") final AppenderRef[] appenderRefs,
102 @PluginConfiguration final Configuration config,
103 @PluginElement("rewritePolicy") final RewritePolicy rewritePolicy,
104 @PluginElement("filter") final Filter filter) {
105
106 final boolean handleExceptions = suppress == null ? true : Boolean.valueOf(suppress);
107
108 if (name == null) {
109 LOGGER.error("No name provided for RewriteAppender");
110 return null;
111 }
112 if (appenderRefs == null) {
113 LOGGER.error("No appender references defined for RewriteAppender");
114 return null;
115 }
116 return new RewriteAppender(name, filter, handleExceptions, appenderRefs, rewritePolicy, config);
117 }
118 }