/
DemoMsgClientHandler.java
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/
DemoMsgClientHandler.java
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package org.demo.nettyprotobuf.client;
import com.google.protobuf.ByteString;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import org.demo.nettyprotobuf.proto.DemoMessages;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class DemoMsgClientHandler extends SimpleChannelInboundHandler<DemoMessages.DemoResponse> {
private Channel channel;
private DemoMessages.DemoResponse resp;
private final BlockingQueue<DemoMessages.DemoResponse> resps = new LinkedBlockingQueue<DemoMessages.DemoResponse>();
public DemoMessages.DemoResponse sendRequest(DemoMessages.Type type) {
DemoMessages.DemoRequest req = null;
// send File request
if (DemoMessages.Type.FILE == type) {
InputStream inputStream = null;
try {
inputStream = getClass().getResourceAsStream("/components.png");
DemoMessages.FileMsg fileMsg = DemoMessages.FileMsg.newBuilder()
.setFileBytes(ByteString.readFrom(inputStream))
.setFilename("components.png")
.build();
req = DemoMessages.DemoRequest.newBuilder()
.setType(DemoMessages.Type.FILE)
.setFile(fileMsg)
.build();
// Send request
channel.writeAndFlush(req);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
} else {
// send message request.
req = DemoMessages.DemoRequest.newBuilder()
.setType(DemoMessages.Type.MSG)
.setRequestMsg("From Client").build();
}
// Send request
channel.writeAndFlush(req);
// Now wait for response from server
boolean interrupted = false;
for (; ; ) {
try {
resp = resps.take();
break;
} catch (InterruptedException ignore) {
interrupted = true;
}
}
if (interrupted) {
Thread.currentThread().interrupt();
}
return resp;
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) {
channel = ctx.channel();
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, DemoMessages.DemoResponse msg)
throws Exception {
resps.add(msg);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}