/**
* Create an appender for a given JNode console.
*
* @param layout the appender's initial log message layout.
* @param toErr if <code>true</code> output to System.err, otherwise output to System.out.
*/
public JNodeSystemAppender(Layout layout, boolean toErr) {
super();
this.layout = layout;
this.immediateFlush = true;
this.writer = new SystemStreamWriter(toErr);
super.setWriter(this.writer);
}
@Override
public synchronized void setWriter(Writer writer) {
if (writer != this.writer) {
throw new IllegalArgumentException("cannot change the writer");
}
super.setWriter(writer);
}
/** Prepares the appender for use. */
public void activateOptions() {
if (follow) {
if (target.equals(SYSTEM_ERR)) {
setWriter(createWriter(new SystemErrStream()));
} else {
setWriter(createWriter(new SystemOutStream()));
}
} else {
if (target.equals(SYSTEM_ERR)) {
setWriter(createWriter(unwrap(System.err)));
} else {
setWriter(createWriter(unwrap(System.out)));
}
}
super.activateOptions();
}
/** The WriterAppender requires a layout. Hence, this method returns <code>true</code>. */
public boolean requiresLayout() {
return appender.requiresLayout();
}
/**
* Sets the Writer where the log output will go. The specified Writer must be opened by the user
* and be writable.
*
* <p>The <code>java.io.Writer</code> will be closed when the appender instance is closed.
*
* <p><b>WARNING:</b> Logging to an unopened Writer will fail.
*
* <p>
*
* @param writer An already opened Writer.
*/
public synchronized void setWriter(Writer writer) {
appender.setWriter(writer);
}
/** Returns the layout of this appender. The value may be null. */
public Layout getLayout() {
return appender.getLayout();
}
/**
* Set the threshold level. All log events with lower level than the threshold level are ignored
* by the appender.
*
* <p>In configuration files this option is specified by setting the value of the <b>Threshold</b>
* option to a level string, such as "DEBUG", "INFO" and so on.
*
* @since 0.8.3
*/
public void setThreshold(Priority threshold) {
appender.setThreshold(threshold);
}
/**
* Clear the filters chain.
*
* @since 0.9.0
*/
public void clearFilters() {
appender.clearFilters();
}
/**
* Set the layout for this appender. Note that some appenders have their own (fixed) layouts or do
* not use one. For example, the {@link org.apache.log4j.net.SocketAppender} ignores the layout
* set here.
*/
public void setLayout(Layout layout) {
appender.setLayout(layout);
}
/** Set the name of this Appender. */
public void setName(String name) {
super.setName(name);
appender.setName(name);
}
/**
* Set the {@link ErrorHandler} for this Appender.
*
* @since 0.9.0
*/
public synchronized void setErrorHandler(ErrorHandler eh) {
appender.setErrorHandler(eh);
}
/**
* Check whether the message level is below the appender's threshold. If there is no threshold
* set, then the return value is always <code>true</code>.
*/
public boolean isAsSevereAsThreshold(Priority priority) {
return appender.isAsSevereAsThreshold(priority);
}
/**
* Returns this appenders threshold level. See the {@link #setThreshold} method for the meaning of
* this option.
*
* @since 1.1
*/
public Priority getThreshold() {
return appender.getThreshold();
}
@Override
public void activateOptions() {
appender.activateOptions();
super.activateOptions();
}
/**
* If the <b>ImmediateFlush</b> option is set to <code>true</code>, the appender will flush at the
* end of each write. This is the default behavior. If the option is set to <code>false</code>,
* then the underlying stream can defer writing to physical medium to a later time.
*
* <p>Avoiding the flush operation at the end of each append results in a performance gain of 10
* to 20 percent. However, there is safety tradeoff involved in skipping flushing. Indeed, when
* flushing is skipped, then it is likely that the last few log events will not be recorded on
* disk when the application exits. This is a high price to pay even for a 20% performance gain.
*/
public void setImmediateFlush(boolean value) {
appender.setImmediateFlush(value);
}
/**
* Add a filter to end of the filter list.
*
* @since 0.9.0
*/
public void addFilter(Filter newFilter) {
appender.addFilter(newFilter);
}
/** Returns value of the <b>ImmediateFlush</b> option. */
public boolean getImmediateFlush() {
return appender.getImmediateFlush();
}
/**
* Return the currently set {@link ErrorHandler} for this Appender.
*
* @since 0.9.0
*/
public ErrorHandler getErrorHandler() {
return appender.getErrorHandler();
}
/**
* Close this appender instance. The underlying stream or writer is also closed.
*
* <p>Closed appenders cannot be reused.
*
* @see #setWriter
* @since 0.8.4
*/
public synchronized void close() {
super.close();
appender.close();
}
@Override
public void activateOptions() {
super.setWriter(writer);
}
public String getEncoding() {
return appender.getEncoding();
}
public TelemetryEventAppender() {
// Hardcoding pattern because should not be under host application control
super.setLayout(new PatternLayout(PATTERN));
}
public void setEncoding(String value) {
appender.setEncoding(value);
}
/** {@inheritDoc} */
protected final void closeWriter() {
if (follow) {
super.closeWriter();
}
}
/**
* Returns the head Filter.
*
* @since 1.1
*/
public Filter getFilter() {
return appender.getFilter();
}
