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* Fixed a documentation error in ChannelBuffer javadoc

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* Clearly specified that FrameDecoder is an implementation of ChannelHandler
This commit is contained in:
Trustin Lee 2011-02-07 19:58:48 +09:00
parent b53742e366
commit 4d6581fe3d
2 changed files with 18 additions and 11 deletions
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27
src/docbook/en-US/module/start.xml
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@ -692,35 +692,41 @@ public class TimeClientHandler extends &SimpleChannelHandler; {
</para>
<programlisting>package org.jboss.netty.example.time;
public class TimeDecoder extends &FrameDecoder; {
public class TimeDecoder extends &FrameDecoder;<co id="example.time4.co1"/> {
@Override
protected Object decode(
&ChannelHandlerContext; ctx, &Channel; channel, &ChannelBuffer; buffer)<co id="example.time4.co1"/> {
&ChannelHandlerContext; ctx, &Channel; channel, &ChannelBuffer; buffer)<co id="example.time4.co2"/> {
if (buffer.readableBytes() &lt; 4) {
return null; <co id="example.time4.co2"/>
return null; <co id="example.time4.co3"/>
}
return buffer.readBytes(4);<co id="example.time4.co3"/>
return buffer.readBytes(4);<co id="example.time4.co4"/>
}
}</programlisting>
<calloutlist>
<callout arearefs="example.time4.co1">
<para>
&FrameDecoder; is an implementation of &ChannelHandler; which
makes it easy to which deals with the fragmentation issue.
</para>
</callout>
<callout arearefs="example.time4.co2">
<para>
&FrameDecoder; calls <methodname>decode</methodname> method with
an internally maintained cumulative buffer whenever new data is
received.
</para>
</callout>
<callout arearefs="example.time4.co2">
<callout arearefs="example.time4.co3">
<para>
If <literal>null</literal> is returned, it means there's not
enough data yet. &FrameDecoder; will call again when there is a
sufficient amount of data.
</para>
</callout>
<callout arearefs="example.time4.co3">
<callout arearefs="example.time4.co4">
<para>
If non-<literal>null</literal> is returned, it means the
<methodname>decode</methodname> method has decoded a message
@ -873,10 +879,11 @@ public void channelConnected(&ChannelHandlerContext; ctx, &ChannelStateEvent; e)
f.addListener(&ChannelFutureListener;.CLOSE);
}</programlisting>
<para>
Now, the only missing piece is the &ChannelHandler; which translates a
<classname>UnixTime</classname> back into a &ChannelBuffer;. It's much
simpler than writing a decoder because there's no need to deal with
packet fragmentation and assembly when encoding a message.
Now, the only missing piece is an encoder, which is an implementation of
&ChannelHandler; that translates a <classname>UnixTime</classname> back
into a &ChannelBuffer;. It's much simpler than writing a decoder because
there's no need to deal with packet fragmentation and assembly when
encoding a message.
</para>
<programlisting>package org.jboss.netty.example.time;

2
src/main/java/org/jboss/netty/buffer/ChannelBuffer.java
View File

@ -48,7 +48,7 @@ import java.nio.charset.UnsupportedCharsetException;
* <pre>
* {@link ChannelBuffer} buffer = ...;
* for (int i = 0; i &lt; buffer.capacity(); i ++</strong>) {
* byte b = array.getByte(i);
* byte b = buffer.getByte(i);
* System.out.println((char) b);
* }
* </pre>