Class ProtobufDecoder
java.lang.Object
org.jboss.netty.handler.codec.oneone.OneToOneDecoder
org.jboss.netty.handler.codec.protobuf.ProtobufDecoder
- All Implemented Interfaces:
ChannelHandler
,ChannelUpstreamHandler
Decodes a received
ChannelBuffer
into a
Google Protocol Buffers
Message
and MessageLite
. Please note that this decoder must
be used with a proper FrameDecoder
such as ProtobufVarint32FrameDecoder
or LengthFieldBasedFrameDecoder
if you are using a stream-based
transport such as TCP/IP. A typical setup for TCP/IP would be:
and then you can use aChannelPipeline
pipeline = ...; // Decoders pipeline.addLast("frameDecoder", newLengthFieldBasedFrameDecoder
(1048576, 0, 4, 0, 4)); pipeline.addLast("protobufDecoder", newProtobufDecoder
(MyMessage.getDefaultInstance())); // Encoder pipeline.addLast("frameEncoder", newLengthFieldPrepender
(4)); pipeline.addLast("protobufEncoder", newProtobufEncoder
());
MyMessage
instead of a ChannelBuffer
as a message:
void messageReceived(ChannelHandlerContext
ctx,MessageEvent
e) { MyMessage req = (MyMessage) e.getMessage(); MyMessage res = MyMessage.newBuilder().setText( "Did you say '" + req.getText() + "'?").build(); ch.write(res); }
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Nested Class Summary
Nested classes/interfaces inherited from interface org.jboss.netty.channel.ChannelHandler
ChannelHandler.Sharable
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final com.google.protobuf.ExtensionRegistry
private static final boolean
private final com.google.protobuf.MessageLite
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Constructor Summary
ConstructorsConstructorDescriptionProtobufDecoder
(com.google.protobuf.MessageLite prototype) Creates a new instance.ProtobufDecoder
(com.google.protobuf.MessageLite prototype, com.google.protobuf.ExtensionRegistry extensionRegistry) -
Method Summary
Modifier and TypeMethodDescriptionprotected Object
decode
(ChannelHandlerContext ctx, Channel channel, Object msg) Transforms the specified received message into another message and return the transformed message.Methods inherited from class org.jboss.netty.handler.codec.oneone.OneToOneDecoder
handleUpstream
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Field Details
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HAS_PARSER
private static final boolean HAS_PARSER -
prototype
private final com.google.protobuf.MessageLite prototype -
extensionRegistry
private final com.google.protobuf.ExtensionRegistry extensionRegistry
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Constructor Details
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ProtobufDecoder
public ProtobufDecoder(com.google.protobuf.MessageLite prototype) Creates a new instance. -
ProtobufDecoder
public ProtobufDecoder(com.google.protobuf.MessageLite prototype, com.google.protobuf.ExtensionRegistry extensionRegistry)
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Method Details
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decode
Description copied from class:OneToOneDecoder
Transforms the specified received message into another message and return the transformed message. Returnnull
if the received message is supposed to be discarded.- Specified by:
decode
in classOneToOneDecoder
- Throws:
Exception
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