Load java function in Lua

Question

Simple QUESTION : Are there ways to run or load java functions inside Lua?

I am trying to create a phone application that transfers files between server and client using Lua. The server uses Java while client uses Lua.

this is a lua function that receives file

function UDPClientModule.receiveFile()
    local data, status
    local chunks = {}
    while true do
        data, status = udp:receive()
        print("status: ", status)
        if data ~= nil then
            table.insert(chunks, data)
            --the filename is the last chunk to be received
            if string.match(data, ".jpg") then
                -- but strangely returns true 
                break
            end
        end
        socket.sleep(0.5)
    end
    --combineAndOpenImage(t)
end

No problems so far. However, the chunks sent by the server are encapsulated in a class like this:

public class FileChunk {
    private List<Data> dataList; 
    //functions below
}
public class Data{
    private byte[] fileData;
    // functions and adding file headers below
} // then UDPServer.java sends bytes of FileChunk

Because of this, packets received by the lua function are strange which also results in string.match(data, ".jpg") returning true. So I want to run java files (eg. UDPClient.java) in order to receive and decipher the chunks, instead of lua.

I don't want to change the server nor migrate the client language to java. I haven't found any resources about this so I need help.

Don't rely on the filename is the last chunk to be received. Use other methods to detect the last chunk. — Egor Skriptunoff
– Egor Skriptunoff, Commented Mar 29, 2016 at 14:36
@EgorSkriptunoff Noted. But the issue is that I cannot decode the chunks using Lua. I may want to run a java helper file instead. — Obito
– Obito, Commented Mar 29, 2016 at 14:53
@warspyking LuaJ is used to run Lua scripts inside Java files. But how about running Java functions inside Lua files? — Obito
– Obito, Commented Mar 29, 2016 at 14:56
To decode the chunks using Lua, you have to know incoming data format. It is enough to write decoder in any programming language. — Egor Skriptunoff
– Egor Skriptunoff, Commented Mar 29, 2016 at 15:00
@EgorSkriptunoff I know the format of the chunks. But I do not know to decode chunks created by java to Lua and I don't have the resources to follow. — Obito
– Obito, Commented Mar 29, 2016 at 15:15

RyanSquared · Accepted Answer · 2016-04-05 15:38:01Z

1

You would need to create a wrapper library, such as the ones in C. I do not know how, but I hope this provides you a sense of direction.

answered Apr 5, 2016 at 15:38

RyanSquared

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