From 0d0db26fff5cec36397d81a4f1d15e4efea29f73 Mon Sep 17 00:00:00 2001
From: Michael Denkowski <mdenkows@cs.cmu.edu>
Date: Wed, 25 Sep 2013 18:45:28 -0700
Subject: Threading tests

---
 realtime/realtime.py | 79 +++++++++++++++++++++++++++++++++++-----------------
 realtime/rt/rt.py    |  4 +++
 2 files changed, 58 insertions(+), 25 deletions(-)

diff --git a/realtime/realtime.py b/realtime/realtime.py
index 282d3311..bbec288b 100755
--- a/realtime/realtime.py
+++ b/realtime/realtime.py
@@ -2,9 +2,9 @@
 
 import argparse
 import logging
-import signal
 import sys
 import threading
+import time
 
 import rt
 
@@ -15,6 +15,41 @@ class Parser(argparse.ArgumentParser):
         sys.stderr.write('\n{}\n'.format(message))
         sys.exit(2)
 
+def handle_line(translator, line, output, ctx_name):
+    if '|||' in line:
+        translator.command_line(line, ctx_name)
+    else:
+        hyp = translator.decode(line, ctx_name)
+        output.write('{}\n'.format(hyp))
+        output.flush()
+
+def test1(translator, input, output, ctx_name):
+    inp = open(input)
+    out = open(output, 'w')
+    for line in inp:
+        handle_line(translator, line.strip(), out, ctx_name)
+    out.close()
+
+def debug(translator, input):
+    # Test 1: identical output
+    threads = []
+    for i in range(4):
+        t = threading.Thread(target=test1, args=(translator, input, '{}.out.{}'.format(input, i), str(i)))
+        threads.append(t)
+        t.start()
+        time.sleep(30)
+    for t in threads:
+        t.join()
+    # Test 2: flood (same number of lines)
+    threads = []
+    out = open('{}.out.flood'.format(input), 'w')
+    for line in open(input):
+        t = threading.Thread(target=handle_line, args=(translator, line.strip(), out, None))
+        threads.append(t)
+        t.start()
+    for t in threads:
+        t.join()
+
 def main():
 
     parser = Parser(description='Real-time adaptive translation with cdec.  (See README.md)')
@@ -24,7 +59,7 @@ def main():
     parser.add_argument('-T', '--temp', help='Temp directory (default /tmp)', default='/tmp')
     parser.add_argument('-a', '--cache', help='Grammar cache size (default 5)', default='5')
     parser.add_argument('-v', '--verbose', help='Info to stderr', action='store_true')
-    parser.add_argument('-D', '--debug-test', help='Test thread safety (debug use only)', action='store_true')
+    parser.add_argument('-D', '--debug-test', help='Run debug tests on input file')
     args = parser.parse_args()
 
     if args.verbose:
@@ -32,29 +67,23 @@ def main():
 
     with rt.RealtimeTranslator(args.config, tmpdir=args.temp, cache_size=int(args.cache), norm=args.normalize) as translator:
 
-            # Load state if given
-            if args.state:
-                with open(args.state) as input:
-                    rtd.load_state(input)
-            if not args.debug_test:
-                run(translator)
+        # Debugging
+        if args.debug_test:
+            debug(translator, args.debug_test)
+            return
+
+        # Read lines and commands
+        while True:
+            line = sys.stdin.readline()
+            if not line:
+                break
+            line = line.strip()
+            if '|||' in line:
+                translator.command_line(line)
             else:
-                # TODO: write test
-                run(translator)
-
-def run(translator, input=sys.stdin, output=sys.stdout, ctx_name=None):
-    # Read lines and commands
-    while True:
-        line = input.readline()
-        if not line:
-            break
-        line = line.strip()
-        if '|||' in line:
-            translator.command_line(line, ctx_name)
-        else:
-            hyp = translator.decode(line, ctx_name)
-            output.write('{}\n'.format(hyp))
-            output.flush()
- 
+                hyp = translator.decode(line)
+                sys.stdout.write('{}\n'.format(hyp))
+                sys.stdout.flush()
+     
 if __name__ == '__main__':
     main()
diff --git a/realtime/rt/rt.py b/realtime/rt/rt.py
index 6f1fb70f..f8126283 100644
--- a/realtime/rt/rt.py
+++ b/realtime/rt/rt.py
@@ -101,6 +101,8 @@ class RealtimeTranslator:
         # ctx -> list of (source, target, alignment)
         self.ctx_data = {}
 
+        # Grammar extractor is not threadsafe
+        self.extractor_sem = threading.Semaphore()
         # ctx -> deque of file
         self.grammar_files = {}
         # ctx -> dict of {sentence: file}
@@ -181,8 +183,10 @@ class RealtimeTranslator:
         (fid, grammar_file) = tempfile.mkstemp(dir=self.decoders[ctx_name].tmp, prefix='grammar.')
         os.close(fid)
         with open(grammar_file, 'w') as output:
+            self.extractor_sem.acquire()
             for rule in self.extractor.grammar(sentence, ctx_name):
                 output.write('{}\n'.format(str(rule)))
+            self.extractor_sem.release()
         grammar_files = self.grammar_files[ctx_name]
         if len(grammar_files) == self.cache_size:
             rm_sent = grammar_files.popleft()
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