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17 package org.apache.logging.log4j.core.appender;
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19 import java.util.concurrent.locks.Lock;
20 import java.util.concurrent.locks.ReadWriteLock;
21 import java.util.concurrent.locks.ReentrantReadWriteLock;
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23 import org.apache.logging.log4j.core.Filter;
24 import org.apache.logging.log4j.core.LogEvent;
25 import org.apache.logging.log4j.core.StringLayout;
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33 public abstract class AbstractWriterAppender<M extends WriterManager> extends AbstractAppender {
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43 protected final boolean immediateFlush;
44 private final M manager;
45 private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
46 private final Lock readLock = readWriteLock.readLock();
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58 protected AbstractWriterAppender(final String name, final StringLayout layout, final Filter filter,
59 final boolean ignoreExceptions, final boolean immediateFlush, final M manager) {
60 super(name, filter, layout, ignoreExceptions);
61 this.manager = manager;
62 this.immediateFlush = immediateFlush;
63 }
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74 @Override
75 public void append(final LogEvent event) {
76 readLock.lock();
77 try {
78 final String str = getStringLayout().toSerializable(event);
79 if (str.length() > 0) {
80 manager.write(str);
81 if (this.immediateFlush || event.isEndOfBatch()) {
82 manager.flush();
83 }
84 }
85 } catch (final AppenderLoggingException ex) {
86 error("Unable to write " + manager.getName() + " for appender " + getName() + ": " + ex);
87 throw ex;
88 } finally {
89 readLock.unlock();
90 }
91 }
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98 public M getManager() {
99 return manager;
100 }
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102 public StringLayout getStringLayout() {
103 return (StringLayout) getLayout();
104 }
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106 @Override
107 public void start() {
108 if (getLayout() == null) {
109 LOGGER.error("No layout set for the appender named [{}].", getName());
110 }
111 if (manager == null) {
112 LOGGER.error("No OutputStreamManager set for the appender named [{}].", getName());
113 }
114 super.start();
115 }
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117 @Override
118 public void stop() {
119 super.stop();
120 manager.release();
121 }
122 }