ICE-1593 Handling thread interrupts in Java

- Added Ice.BackgroundIO property to perform all IO in a non-user
  thread. This makes Ice for Java interrupt safe. This is implemented
  by the QueueRequestHanbler.
- EndpointHostResolver now uses an executor instead of a thread.
- Added java/demo/Ice/interrupt and java/test/Ice/interrupt.
- Made several changes that must be ported to C++ & C#.
  - InvocationTimeout exceptions can hang forever.
  - Connection establishment is always asynchronous.
  - RequestHandler.requestTimeout and asyncRequestTimeout have been
    renamed to requestCancel and asyncRequestCancel.

1 files changed, 8 insertions, 0 deletions

diff --git a/cpp/src/Ice/Exception.cpp b/cpp/src/Ice/Exception.cpp
index af4e44e6087..a8bb8c6f81a 100644
--- a/cpp/src/Ice/Exception.cpp
+++ b/cpp/src/Ice/Exception.cpp
@@ -459,6 +459,14 @@ Ice::DNSException::ice_print(ostream& out) const
 }
 
 void
+Ice::OperationInterruptedException::ice_print(ostream& out) const
+{
+    Exception::ice_print(out);
+    out << ":\noperation interrupted";
+}
+
+
+void
 Ice::TimeoutException::ice_print(ostream& out) const
 {
     Exception::ice_print(out);