fritzprix / yarmi Goto Github PK

to support Android device below N

maven test is failing on Travis CI environment, which is not reproduced on my own machine.

java.lang.NullPointerException
at com.doodream.rmovjs.test.ServiceNoReplyTest.startServer(ServiceNoReplyTest.java:28)
[INFO] Running com.doodream.rmovjs.test.EchoBackTest
[ERROR] Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 0 s <<< FAILURE! - in com.doodream.rmovjs.test.EchoBackTest
[ERROR] com.doodream.rmovjs.test.EchoBackTest Time elapsed: 0 s <<< ERROR!
java.lang.NullPointerException
at com.doodream.rmovjs.test.EchoBackTest.startServer(EchoBackTest.java:35)
[ERROR] com.doodream.rmovjs.test.EchoBackTest Time elapsed: 0 s <<< ERROR!
java.lang.NullPointerException
at com.doodream.rmovjs.test.EchoBackTest.stopServer(EchoBackTest.java:43)

• Replace endpoint field in Request with smaller alternative

json is inefficient for binary data exchange due to

• base64 encoding / decoding overhead
• byte length of base64 encoded byte array is much larger than byte array

Data missed at the end of the stream happens quite often in multi threading situation

• PipedInput/Outputstream is used for delivering the incoming data from the network (socket) to the another read end point.
• each writer & reader is performed at different thread
• read() returns -1 when the writer thread is dead
• reader finishes the read loop

If alternative (spf4j) is used the issue has been resolved.

class serialization performed with Class.getName() -> Class.forName()
in this way, there are some cases out of handle

• return type or any parameter using type parameter in recursive like Response<List>

Gson handles json object whose type is ambiguous in runtime by generating generic key value map.

• method invocation and return should be atomic considering concurrent scenario

provides RMI proxy which delegates multiple service proxy in order to

• support high availability
• optionally provides load balancing feature

W/System.err: Caused by: java.lang.NoSuchMethodError: No virtual method getParameterCount()I in class Ljava/lang/reflect/Constructor; or its super classes (declaration of 'java.lang.reflect.Constructor' appears in /system/framework/core-libart.jar)
W/System.err: at com.doodream.rmovjs.net.tcp.TcpServiceAdapter$3.test(TcpServiceAdapter.java:45)
W/System.err: at com.doodream.rmovjs.net.tcp.TcpServiceAdapter$3.test(TcpServiceAdapter.java:42)

method invoke with null argument was equivalent to invoke with no argument in Java8 (no problem with no-arg method)
method invoke with null argument for no-arg method raise IllegalArgumentException in Java7

originally method invocation has been directly performed by calling RMIClient::invoke method and it was changed to calling call proxy of RMIClient later. however, the invocation has not reflected the change

SimpleServiceDiscovery & SimpleServiceAdvertiser is tested on single host so far, there was no problem. but testing between two host it doesn't work. tried to modify udp related code as below but still doesn't work

creating packet

return new DatagramPacket(infoByteString, infoByteString.length, Inet4Address.getByName("255.255.255.255"), BROADCAST_PORT);

sending it

        DatagramSocket socket = new DatagramSocket();
        socket.setBroadcast(true);
        socket.send(datagramPacket);
        socket.close();

receiver

       DatagramSocket serviceBroadcastSocket = new DatagramSocket(SimpleServiceAdvertiser.BROADCAST_PORT);
       serviceBroadcastSocket.setBroadcast(true);

receiving

        byte[] buffer = new byte[64 * 1024];
        Arrays.fill(buffer, (byte) 0);
        DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
        serviceBroadcastSocket.receive(packet);

and tcpdump shows broadcast packet dest address of 255.255.255.255

Opt #1. socket
Opt #2. byte array

• there should be mod in de-ser interface to support both cases in above

remove libraries widely adopted in developing application to prevent unnecessary dependency conflict.

list

• gson
• guava
• rxjava

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• check service availability with defined policy
• provides service recovery

unique key is generated by code below (com.doodream.rmovjs.model.Endpoint)

final String methodLookupKey = String.format("%x%x%x", rmiMethod.hashCode(), controller.path().hashCode(), paramUnique.hashCode()).toUpperCase();

which was actually generate same keys for methods whose RMIMethod declared / parameter / enclosing controller are same.