private object CallJavaMethod(
bool isStatic,
object classNameOrJvmObjectReference,
string methodName,
object[] args)
{
object returnValue = null;
ISocketWrapper socket = null;
try
{
// dotnet-interactive does not have a dedicated thread to process
// code submissions and each code submission can be processed in different
// threads. DotnetHandler uses the CLR thread id to ensure that the same
// JVM thread is used to handle the request, which means that code submitted
// through dotnet-interactive may be executed in different JVM threads. To
// mitigate this, when running in the REPL, submit requests to the DotnetHandler
// using the same thread id. This mitigation has some limitations in multithreaded
// scenarios. If a JVM method is blocking and needs a JVM method call issued by a
// separate thread to unblock it, then this scenario is not supported.
//
// ie, `StreamingQuery.AwaitTermination()` is a blocking call and requires
// `StreamingQuery.Stop()` to be called to unblock it. However, the `Stop`
// call will never run because DotnetHandler will assign the method call to
// run on the same thread that `AwaitTermination` is running on.
Thread thread = _isRunningRepl ? null : Thread.CurrentThread;
int threadId = thread == null ? ThreadIdForRepl : thread.ManagedThreadId;
MemoryStream payloadMemoryStream = s_payloadMemoryStream ??= new MemoryStream();
payloadMemoryStream.Position = 0;
PayloadHelper.BuildPayload(
payloadMemoryStream,
isStatic,
_processId,
threadId,
classNameOrJvmObjectReference,
methodName,
args);
socket = GetConnection();
Stream outputStream = socket.OutputStream;
outputStream.Write(
payloadMemoryStream.GetBuffer(),
0,
(int)payloadMemoryStream.Position);
outputStream.Flush();
if (thread != null)
{
_jvmThreadPoolGC.TryAddThread(thread);
}
Stream inputStream = socket.InputStream;
int isMethodCallFailed = SerDe.ReadInt32(inputStream);
if (isMethodCallFailed != 0)
{
string jvmFullStackTrace = SerDe.ReadString(inputStream);
string errorMessage = BuildErrorMessage(
isStatic,
classNameOrJvmObjectReference,
methodName,
args);
_logger.LogError(errorMessage);
_logger.LogError(jvmFullStackTrace);
throw new Exception(errorMessage, new JvmException(jvmFullStackTrace));
}
char typeAsChar = Convert.ToChar(inputStream.ReadByte());
switch (typeAsChar) // TODO: Add support for other types.
{
case 'n':
break;
case 'j':
returnValue = new JvmObjectReference(SerDe.ReadString(inputStream), this);
break;
case 'c':
returnValue = SerDe.ReadString(inputStream);
break;
case 'i':
returnValue = SerDe.ReadInt32(inputStream);
break;
case 'g':
returnValue = SerDe.ReadInt64(inputStream);
break;
case 'd':
returnValue = SerDe.ReadDouble(inputStream);
break;
case 'b':
returnValue = Convert.ToBoolean(inputStream.ReadByte());
break;
case 'l':
returnValue = ReadCollection(inputStream);
break;
default:
// Convert typeAsChar to UInt32 because the char may be non-printable.
throw new NotSupportedException(
string.Format(
"Identifier for type 0x{0:X} not supported",
Convert.ToUInt32(typeAsChar)));
}
_sockets.Enqueue(socket);
}
catch (Exception e)
{
_logger.LogException(e);
if (e.InnerException is JvmException)
{
// DotnetBackendHandler caught JVM exception and passed back to dotnet.
// We can reuse this connection.
_sockets.Enqueue(socket);
}
else
{
// In rare cases we may hit the Netty connection thread deadlock.
// If max backend threads is 10 and we are currently using 10 active
// connections (0 in the _sockets queue). When we hit this exception,
// the socket?.Dispose() will not requeue this socket and we will release
// the semaphore. Then in the next thread (assuming the other 9 connections
// are still busy), a new connection will be made to the backend and this
// connection may be scheduled on the blocked Netty thread.
socket?.Dispose();
}
throw;
}
finally
{
_socketSemaphore.Release();
}
return(returnValue);
}
private object CallJavaMethod(
bool isStatic,
object classNameOrJvmObjectReference,
string methodName,
object[] args)
{
object returnValue = null;
ISocketWrapper socket = null;
try
{
Thread thread = Thread.CurrentThread;
MemoryStream payloadMemoryStream = s_payloadMemoryStream ??= new MemoryStream();
payloadMemoryStream.Position = 0;
PayloadHelper.BuildPayload(
payloadMemoryStream,
isStatic,
thread.ManagedThreadId,
classNameOrJvmObjectReference,
methodName,
args);
socket = GetConnection();
Stream outputStream = socket.OutputStream;
outputStream.Write(
payloadMemoryStream.GetBuffer(),
0,
(int)payloadMemoryStream.Position);
outputStream.Flush();
_jvmThreadPoolGC.TryAddThread(thread);
Stream inputStream = socket.InputStream;
int isMethodCallFailed = SerDe.ReadInt32(inputStream);
if (isMethodCallFailed != 0)
{
string jvmFullStackTrace = SerDe.ReadString(inputStream);
string errorMessage = BuildErrorMessage(
isStatic,
classNameOrJvmObjectReference,
methodName,
args);
_logger.LogError(errorMessage);
_logger.LogError(jvmFullStackTrace);
throw new Exception(errorMessage, new JvmException(jvmFullStackTrace));
}
char typeAsChar = Convert.ToChar(inputStream.ReadByte());
switch (typeAsChar) // TODO: Add support for other types.
{
case 'n':
break;
case 'j':
returnValue = new JvmObjectReference(SerDe.ReadString(inputStream), this);
break;
case 'c':
returnValue = SerDe.ReadString(inputStream);
break;
case 'i':
returnValue = SerDe.ReadInt32(inputStream);
break;
case 'g':
returnValue = SerDe.ReadInt64(inputStream);
break;
case 'd':
returnValue = SerDe.ReadDouble(inputStream);
break;
case 'b':
returnValue = Convert.ToBoolean(inputStream.ReadByte());
break;
case 'l':
returnValue = ReadCollection(inputStream);
break;
default:
// Convert typeAsChar to UInt32 because the char may be non-printable.
throw new NotSupportedException(
string.Format(
"Identifier for type 0x{0:X} not supported",
Convert.ToUInt32(typeAsChar)));
}
_sockets.Enqueue(socket);
}
catch (Exception e)
{
_logger.LogException(e);
if (e.InnerException is JvmException)
{
// DotnetBackendHandler caught JVM exception and passed back to dotnet.
// We can reuse this connection.
_sockets.Enqueue(socket);
}
else
{
// In rare cases we may hit the Netty connection thread deadlock.
// If max backend threads is 10 and we are currently using 10 active
// connections (0 in the _sockets queue). When we hit this exception,
// the socket?.Dispose() will not requeue this socket and we will release
// the semaphore. Then in the next thread (assuming the other 9 connections
// are still busy), a new connection will be made to the backend and this
// connection may be scheduled on the blocked Netty thread.
socket?.Dispose();
}
throw;
}
finally
{
_socketSemaphore.Release();
}
return(returnValue);
}