From 16faa4c0be3f44307c78d48e969bbddc38734d3b Mon Sep 17 00:00:00 2001
From: rusefi <rusefillc@gmail.com>
Date: Fri, 22 Nov 2019 17:19:44 -0500
Subject: [PATCH] chrome tracing is pretty cool

---
 .../src/com/rusefi/tracing/JsonOutput.java    | 43 +++++++++++++++++++
 .../models/src/com/rusefi/tracing/Phase.java  |  2 +
 2 files changed, 45 insertions(+)
 create mode 100644 java_console/models/src/com/rusefi/tracing/JsonOutput.java

diff --git a/java_console/models/src/com/rusefi/tracing/JsonOutput.java b/java_console/models/src/com/rusefi/tracing/JsonOutput.java
new file mode 100644
index 0000000000..96931b73d7
--- /dev/null
+++ b/java_console/models/src/com/rusefi/tracing/JsonOutput.java
@@ -0,0 +1,43 @@
+package com.rusefi.tracing;
+
+import java.io.*;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * This class helps to write JSON files readable by chrome://tracing/
+ * <p>
+ * See https://github.com/catapult-project/catapult/blob/master/tracing/README.md
+ */
+public class JsonOutput {
+
+    public static void main(String[] args) throws IOException {
+        List<Entry> testEntries = Arrays.asList(
+                new Entry("hello", Phase.B, 0.1),
+                new Entry("hello2", Phase.B, 0.2),
+                new Entry("hello2", Phase.E, 0.3),
+                new Entry("hello", Phase.E, 0.4)
+        );
+
+        writeToStream(testEntries, new FileOutputStream("hello_trace.json"));
+    }
+
+    private static void writeToStream(List<Entry> testEntries, OutputStream outputStream) throws IOException {
+
+        Writer out = new OutputStreamWriter(outputStream);
+        out.write("{\"traceEvents\": [\n");
+
+        boolean isFirst = true;
+        for (Entry e : testEntries) {
+            if (isFirst) {
+                isFirst = false;
+            } else {
+                out.write(",");
+            }
+            out.write(e.toString() + "\r\n");
+        }
+
+        out.write("]}");
+        out.close();
+    }
+}
diff --git a/java_console/models/src/com/rusefi/tracing/Phase.java b/java_console/models/src/com/rusefi/tracing/Phase.java
index fceb035743..c1185d798f 100644
--- a/java_console/models/src/com/rusefi/tracing/Phase.java
+++ b/java_console/models/src/com/rusefi/tracing/Phase.java
@@ -1,7 +1,9 @@
 package com.rusefi.tracing;
 
 public enum Phase {
+    // Begin
     B,
+    // End
     E,
     i,
 }