org.jboss.netty.handler.codec.frame
类 LengthFieldPrepender
java.lang.Object
org.jboss.netty.handler.codec.oneone.OneToOneEncoder
org.jboss.netty.handler.codec.frame.LengthFieldPrepender
- 所有已实现的接口：
- ChannelDownstreamHandler, ChannelHandler
@ChannelHandler.Sharable
public class LengthFieldPrepender
- extends OneToOneEncoder
An encoder that prepends the length of the message. The length value is
prepended as a binary form. It is encoded in either big endian or little
endian depending on the default ByteOrder of the current
ChannelBufferFactory.
For example, LengthFieldPrepender(2) will encode the
following 12-bytes string:
+----------------+
| "HELLO, WORLD" |
+----------------+
into the following:
+--------+----------------+
+ 0x000C | "HELLO, WORLD" |
+--------+----------------+
If you turned on the lengthIncludesLengthFieldLength flag in the
constructor, the encoded data would look like the following
(12 (original data) + 2 (prepended data) = 14 (0xE)):
+--------+----------------+
+ 0x000E | "HELLO, WORLD" |
+--------+----------------+
| 从类 java.lang.Object 继承的方法 |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
LengthFieldPrepender
public LengthFieldPrepender(int lengthFieldLength)
- Creates a new instance.
- 参数：
lengthFieldLength - the length of the prepended length field.
Only 1, 2, 3, 4, and 8 are allowed.
- 抛出：
java.lang.IllegalArgumentException - if lengthFieldLength is not 1, 2, 3, 4, or 8
LengthFieldPrepender
public LengthFieldPrepender(int lengthFieldLength,
boolean lengthIncludesLengthFieldLength)
- Creates a new instance.
- 参数：
lengthFieldLength - the length of the prepended length field.
Only 1, 2, 3, 4, and 8 are allowed.lengthIncludesLengthFieldLength - if true, the length of the prepended
length field is added to the value of the
prepended length field.
- 抛出：
java.lang.IllegalArgumentException - if lengthFieldLength is not 1, 2, 3, 4, or 8