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