Refactor: Remove need of OutgoingCaptureFile in JSONTimelineDecoder

 * moves ownership of the output file to caller of TimelineDecoder
 * by using ostream the output can be printed to std::cout or any other file stream
 * updated unit test accordingly

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Iaa8994e9997c674c1a026a65fcbd1ab8e3832d3e

3 files changed, 21 insertions, 20 deletions

diff --git a/src/timelineDecoder/JSONTimelineDecoder.cpp b/src/timelineDecoder/JSONTimelineDecoder.cpp
index a0392149ed..c0e81370ed 100644
--- a/src/timelineDecoder/JSONTimelineDecoder.cpp
+++ b/src/timelineDecoder/JSONTimelineDecoder.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright © 2020 Arm Ltd. All rights reserved.
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
@@ -242,12 +242,10 @@ void JSONTimelineDecoder::JSONEntity::SetParent(JSONEntity& parent)
     parent.childEntities.push_back(GetGuid());
 }
 
-void JSONTimelineDecoder::PrintJSON(JSONTimelineDecoder::JSONEntity& rootEntity)
+void JSONTimelineDecoder::PrintJSON(JSONTimelineDecoder::JSONEntity& rootEntity, std::ostream& os)
 {
     std::string jsonString = GetJSONString(rootEntity);
-    std::ofstream ofs{this->outputJSONFile};
-    ofs << jsonString;
-    ofs.close();
+    os << jsonString;
 }
 
 std::string JSONTimelineDecoder::GetJSONString(JSONTimelineDecoder::JSONEntity& rootEntity)
@@ -377,11 +375,6 @@ const JSONTimelineDecoder::Model &JSONTimelineDecoder::GetModel()
     return m_Model;
 }
 
-void JSONTimelineDecoder::SetOutgoingCaptureFile(const std::string& outgoingCaptureFile)
-{
-    this->outputJSONFile = outgoingCaptureFile;
-}
-
 void JSONTimelineDecoder::JSONEntity::SetName(std::string entityName)
 {
     this->name = entityName;
diff --git a/src/timelineDecoder/JSONTimelineDecoder.hpp b/src/timelineDecoder/JSONTimelineDecoder.hpp
index 4d6fcecebd..a6e2579b45 100644
--- a/src/timelineDecoder/JSONTimelineDecoder.hpp
+++ b/src/timelineDecoder/JSONTimelineDecoder.hpp
@@ -1,5 +1,5 @@
 //
-// Copyright © 2020 Arm Ltd. All rights reserved.
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
@@ -49,7 +49,7 @@ public:
         std::map<uint64_t, EventClass> eventClasses;
     };
 
-    void PrintJSON(JSONEntity& entity);
+    void PrintJSON(JSONEntity& entity, std::ostream& os);
     std::string GetJSONString(JSONEntity& rootEntity);
     std::string GetJSONEntityString(JSONEntity& entity, int& counter);
 
@@ -60,13 +60,9 @@ public:
     virtual TimelineStatus CreateRelationship(const Relationship&) override;
 
     const Model& GetModel();
-    void SetOutgoingCaptureFile(const std::string& basicString);
 
 private:
     Model m_Model;
-    fs::path p = armnnUtils::Filesystem::NamedTempFile("output.json");
-
-    std::string outputJSONFile = p.string();
 
     void HandleRetentionLink(const Relationship& relationship);
     void HandleLabelLink(const Relationship& relationship);
diff --git a/src/timelineDecoder/tests/JSONTimelineDecoderTests.cpp b/src/timelineDecoder/tests/JSONTimelineDecoderTests.cpp
index 82414192f2..3961f9bfb5 100644
--- a/src/timelineDecoder/tests/JSONTimelineDecoderTests.cpp
+++ b/src/timelineDecoder/tests/JSONTimelineDecoderTests.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright © 2020 Arm Ltd. All rights reserved.
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
@@ -795,14 +795,23 @@ BOOST_AUTO_TEST_CASE(JSONTimelineDecoderTestJSON)
     BOOST_CHECK(jsonString.find("normalization_2: {")!=std::string::npos);
     BOOST_CHECK(jsonString.find("output_4: {")!=std::string::npos);
 
-    timelineDecoder.PrintJSON(rootEntity);
+    // Create a temporary file to write Json output to
+    fs::path tempFile = armnnUtils::Filesystem::NamedTempFile("JSONTimelineDecoderTestJSON.json");
+    // open temp file
+    std::ofstream ofs{tempFile};
+    // tell the timeline decoder to print into our temp file (you could also use std::cout)
+    timelineDecoder.PrintJSON(rootEntity, ofs);
+    // close temp file
+    ofs.close();
 
+    // Now everything in opposite order
     fs::ifstream inFile;
-    fs::path p{fs::temp_directory_path() / "output.json"};
-    inFile.open(p); //open the input file
+    //reopen the file this time for reading
+    inFile.open(tempFile);
 
     std::stringstream strStream;
     strStream << inFile.rdbuf(); //read the file
+    inFile.close();
     std::string outfileJson = strStream.str();
 
     BOOST_CHECK(outfileJson != "");
@@ -811,5 +820,8 @@ BOOST_AUTO_TEST_CASE(JSONTimelineDecoderTestJSON)
                                 "\t\t\tbackendId :CpuRef,")!=std::string::npos);
     BOOST_CHECK(outfileJson.find("normalization_2: {")!=std::string::npos);
     BOOST_CHECK(outfileJson.find("output_4: {")!=std::string::npos);
+
+    // Remove temporary file
+    fs::remove(tempFile);
 }
 BOOST_AUTO_TEST_SUITE_END()
\ No newline at end of file