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17 package org.apache.logging.log4j.core.appender;
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19 import org.apache.logging.log4j.core.Filter;
20 import org.apache.logging.log4j.core.Layout;
21 import org.apache.logging.log4j.core.LogEvent;
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23 import java.util.concurrent.locks.Lock;
24 import java.util.concurrent.locks.ReadWriteLock;
25 import java.util.concurrent.locks.ReentrantReadWriteLock;
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30 public abstract class AbstractOutputStreamAppender extends AbstractAppender {
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41 protected final boolean immediateFlush;
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43 private volatile OutputStreamManager manager;
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45 private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
46 private final Lock readLock = rwLock.readLock();
47 private final Lock writeLock = rwLock.writeLock();
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57 protected AbstractOutputStreamAppender(final String name, final Layout layout, final Filter filter,
58 final boolean handleException, final boolean immediateFlush,
59 final OutputStreamManager manager) {
60 super(name, filter, layout, handleException);
61 if (layout != null) {
62 manager.setHeader(layout.getHeader());
63 manager.setFooter(layout.getFooter());
64 }
65 this.manager = manager;
66 this.immediateFlush = immediateFlush;
67 }
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69 protected OutputStreamManager getManager() {
70 return manager;
71 }
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73 protected void replaceManager(final OutputStreamManager newManager) {
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75 writeLock.lock();
76 try {
77 final OutputStreamManager old = manager;
78 manager = newManager;
79 old.release();
80 } finally {
81 writeLock.unlock();
82 }
83
84 }
85
86 @Override
87 public void start() {
88 if (getLayout() == null) {
89 LOGGER.error("No layout set for the appender named [" + getName() + "].");
90 }
91 if (manager == null) {
92 LOGGER.error("No OutputStreamManager set for the appender named [" + getName() + "].");
93 }
94 super.start();
95 }
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97 @Override
98 public void stop() {
99 super.stop();
100 manager.release();
101 }
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110 public void append(final LogEvent event) {
111 readLock.lock();
112 try {
113 final byte[] bytes = getLayout().toByteArray(event);
114 if (bytes.length > 0) {
115 manager.write(bytes);
116 if (this.immediateFlush || event.isEndOfBatch()) {
117 manager.flush();
118 }
119 }
120 } catch (final AppenderRuntimeException ex) {
121 error("Unable to write to stream " + manager.getName() + " for appender " + getName());
122 throw ex;
123 } finally {
124 readLock.unlock();
125 }
126 }
127 }