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17 package org.apache.logging.log4j.core.appender;
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19 import java.io.Serializable;
20 import java.util.concurrent.locks.Lock;
21 import java.util.concurrent.locks.ReadWriteLock;
22 import java.util.concurrent.locks.ReentrantReadWriteLock;
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24 import org.apache.logging.log4j.core.Filter;
25 import org.apache.logging.log4j.core.Layout;
26 import org.apache.logging.log4j.core.LogEvent;
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33 public abstract class AbstractOutputStreamAppender<M extends OutputStreamManager> extends AbstractAppender {
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35 private static final long serialVersionUID = 1L;
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43 protected final boolean immediateFlush;
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45 private final M manager;
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47 private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
48 private final Lock readLock = rwLock.readLock();
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58 protected AbstractOutputStreamAppender(final String name, final Layout<? extends Serializable> layout,
59 final Filter filter, 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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70 public M getManager() {
71 return manager;
72 }
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74 @Override
75 public void start() {
76 if (getLayout() == null) {
77 LOGGER.error("No layout set for the appender named [" + getName() + "].");
78 }
79 if (manager == null) {
80 LOGGER.error("No OutputStreamManager set for the appender named [" + getName() + "].");
81 }
82 super.start();
83 }
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85 @Override
86 public void stop() {
87 super.stop();
88 manager.release();
89 }
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99 @Override
100 public void append(final LogEvent event) {
101 readLock.lock();
102 try {
103 final byte[] bytes = getLayout().toByteArray(event);
104 if (bytes.length > 0) {
105 manager.write(bytes);
106 if (this.immediateFlush || event.isEndOfBatch()) {
107 manager.flush();
108 }
109 }
110 } catch (final AppenderLoggingException ex) {
111 error("Unable to write to stream " + manager.getName() + " for appender " + getName());
112 throw ex;
113 } finally {
114 readLock.unlock();
115 }
116 }
117 }