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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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35 private static final long serialVersionUID = 1L;
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45 protected final boolean immediateFlush;
46 private final M manager;
47 private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
48 private final Lock readLock = readWriteLock.readLock();
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60 protected AbstractWriterAppender(final String name, final StringLayout layout, final Filter filter,
61 final boolean ignoreExceptions, final boolean immediateFlush, final M manager) {
62 super(name, filter, layout, ignoreExceptions);
63 this.manager = manager;
64 this.immediateFlush = immediateFlush;
65 }
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76 @Override
77 public void append(final LogEvent event) {
78 readLock.lock();
79 try {
80 final String str = getStringLayout().toSerializable(event);
81 if (str.length() > 0) {
82 manager.write(str);
83 if (this.immediateFlush || event.isEndOfBatch()) {
84 manager.flush();
85 }
86 }
87 } catch (final AppenderLoggingException ex) {
88 error("Unable to write " + manager.getName() + " for appender " + getName() + ": " + ex);
89 throw ex;
90 } finally {
91 readLock.unlock();
92 }
93 }
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100 public M getManager() {
101 return manager;
102 }
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104 public StringLayout getStringLayout() {
105 return (StringLayout) getLayout();
106 }
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108 @Override
109 public void start() {
110 if (getLayout() == null) {
111 LOGGER.error("No layout set for the appender named [{}].", getName());
112 }
113 if (manager == null) {
114 LOGGER.error("No OutputStreamManager set for the appender named [{}].", getName());
115 }
116 super.start();
117 }
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119 @Override
120 public void stop() {
121 super.stop();
122 manager.release();
123 }
124 }