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StreamGobbler
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ch.ethz.ssh2</FONT>
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Class StreamGobbler</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="extended by ">java.io.InputStream
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>ch.ethz.ssh2.StreamGobbler</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.io.Closeable</DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>StreamGobbler</B><DT>extends java.io.InputStream</DL>
</PRE>
<P>
A <code>StreamGobbler</code> is an InputStream that uses an internal worker
thread to constantly consume input from another InputStream. It uses a buffer
to store the consumed data. The buffer size is automatically adjusted, if needed.
<p>
This class is sometimes very convenient - if you wrap a session's STDOUT and STDERR
InputStreams with instances of this class, then you don't have to bother about
the shared window of STDOUT and STDERR in the low level SSH-2 protocol,
since all arriving data will be immediatelly consumed by the worker threads.
Also, as a side effect, the streams will be buffered (e.g., single byte
read() operations are faster).
<p>
Other SSH for Java libraries include this functionality by default in
their STDOUT and STDERR InputStream implementations, however, please be aware
that this approach has also a downside:
<p>
If you do not call the StreamGobbler's <code>read()</code> method often enough
and the peer is constantly sending huge amounts of data, then you will sooner or later
encounter a low memory situation due to the aggregated data (well, it also depends on the Java heap size).
Joe Average will like this class anyway - a paranoid programmer would never use such an approach.
<p>
The term "StreamGobbler" was taken from an article called "When Runtime.exec() won't",
see http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html.
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<TD><CODE><B><A HREF="../../../ch/ethz/ssh2/StreamGobbler.html#StreamGobbler(java.io.InputStream)">StreamGobbler</A></B>(java.io.InputStream is)</CODE>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../ch/ethz/ssh2/StreamGobbler.html#available()">available</A></B>()</CODE>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../ch/ethz/ssh2/StreamGobbler.html#close()">close</A></B>()</CODE>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../ch/ethz/ssh2/StreamGobbler.html#read()">read</A></B>()</CODE>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../ch/ethz/ssh2/StreamGobbler.html#read(byte[])">read</A></B>(byte[] b)</CODE>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../ch/ethz/ssh2/StreamGobbler.html#read(byte[], int, int)">read</A></B>(byte[] b,
int off,
int len)</CODE>
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<TD><CODE>mark, markSupported, reset, skip</CODE></TD>
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<A NAME="StreamGobbler(java.io.InputStream)"><!-- --></A><H3>
StreamGobbler</H3>
<PRE>
public <B>StreamGobbler</B>(java.io.InputStream is)</PRE>
<DL>
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<A NAME="read()"><!-- --></A><H3>
read</H3>
<PRE>
public int <B>read</B>()
throws java.io.IOException</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>read</CODE> in class <CODE>java.io.InputStream</CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="available()"><!-- --></A><H3>
available</H3>
<PRE>
public int <B>available</B>()
throws java.io.IOException</PRE>
<DL>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>available</CODE> in class <CODE>java.io.InputStream</CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="read(byte[])"><!-- --></A><H3>
read</H3>
<PRE>
public int <B>read</B>(byte[] b)
throws java.io.IOException</PRE>
<DL>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>read</CODE> in class <CODE>java.io.InputStream</CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
throws java.io.IOException</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>close</CODE> in interface <CODE>java.io.Closeable</CODE><DT><B>Overrides:</B><DD><CODE>close</CODE> in class <CODE>java.io.InputStream</CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="read(byte[], int, int)"><!-- --></A><H3>
read</H3>
<PRE>
public int <B>read</B>(byte[] b,
int off,
int len)
throws java.io.IOException</PRE>
<DL>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>read</CODE> in class <CODE>java.io.InputStream</CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
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