Add an AutoTrace example

examples/autotrace/README.md

@@ -0,0 +1,9 @@
+# AutoTrace Example
+This example shows how to use AutoTrace to automatically instrument MATLAB code. The instrumented code in *autotrace_example.m* fits a line through a cluster of data points. Notice that it does not include any instrumentation code. 
+The function *run_example.m* first configures a tracer provider. This step only needs to be done once in a MATLAB session. Then it creates an AutoTrace object and runs it. The AutoTrace object gets cleaned up at the end. 
+
+## Running the Example
+1. Start an instance of [OpenTelemetry Collector](https://github.com/open-telemetry/opentelemetry-collector).
+2. Start MATLAB. 
+3. Ensure the installation directory of OpenTelemetry-matlab is on the MATLAB path.
+4. Run `run_example`.

examples/autotrace/autotrace_example.m

@@ -0,0 +1,25 @@
+function yf = autotrace_example
+% This example shows some simple MATLAB code that fits a line through a 
+% cluster of data points. It does not include any instrumentation code.
+
+% Copyright 2024 The MathWorks, Inc.
+
+[x, y] = generate_data();
+yf = best_fit_line(x,y);
+end
+
+function [x, y] = generate_data
+% generate some random data
+a = 1.5;
+b = 0.8;
+sigma = 5;
+x = 1:100;
+y = a * x + b + sigma * randn(1, 100);
+end
+
+function yf = best_fit_line(x, y)
+% fit a line through points defined by inputs x and y
+coefs = polyfit(x, y, 1);
+yf = polyval(coefs , x);
+end
+

examples/autotrace/run_example.m

@@ -0,0 +1,16 @@
+function yf = run_example
+% Use AutoTrace to automatically instrument an example to produce a trace.
+
+% Copyright 2024 The MathWorks, Inc.
+
+% configure tracer provider
+resource = dictionary("service.name", "OpenTelemetry-Matlab_examples");
+tp = opentelemetry.sdk.trace.TracerProvider(Resource=resource);
+setTracerProvider(tp);
+
+% create AutoTrace object
+at = opentelemetry.autoinstrument.AutoTrace(@autotrace_example, ...
+    TracerName="autotrace_example");
+
+% run the example
+yf = beginTrace(at);

examples/context_propagation/matlab/mymagic.m

@@ -41,8 +41,7 @@
 function initTracer
 % set up global TracerProvider
 resource = dictionary("service.name", "OpenTelemetry-Matlab_examples");
-tp = opentelemetry.sdk.trace.TracerProvider(...
-    opentelemetry.sdk.trace.SimpleSpanProcessor, Resource=resource);
+tp = opentelemetry.sdk.trace.TracerProvider(Resource=resource);
 setTracerProvider(tp);
 
 % set up global propagator

examples/logs/logs_example.m

@@ -44,8 +44,7 @@
 function initLogger
 % set up global LoggerProvider
 resource = dictionary("service.name", "OpenTelemetry-Matlab_examples");
-lp = opentelemetry.sdk.logs.LoggerProvider(...
-    opentelemetry.sdk.logs.SimpleLogRecordProcessor, Resource=resource);
+lp = opentelemetry.sdk.logs.LoggerProvider(Resource=resource);
 setLoggerProvider(lp);
 end
 

examples/metrics/metrics_example.m

@@ -34,8 +34,7 @@ function metrics_example(iterations)
 
 function initMetrics
 % set up global MeterProvider
-exp = opentelemetry.exporters.otlp.defaultMetricExporter();
-reader = opentelemetry.sdk.metrics.PeriodicExportingMetricReader(exp, ...
+reader = opentelemetry.sdk.metrics.PeriodicExportingMetricReader(...
     "Interval", seconds(5), "Timeout", seconds(2.5));  % exports every 5 seconds
 % Use custom histogram bins
 v = opentelemetry.sdk.metrics.View(InstrumentType="histogram", HistogramBinEdges=0:10:100);

examples/parallel/parfor_example.m

@@ -50,8 +50,7 @@
 function initTracer
 % set up global TracerProvider
 resource = dictionary("service.name", "OpenTelemetry-Matlab_examples");
-tp = opentelemetry.sdk.trace.TracerProvider(...
-    opentelemetry.sdk.trace.SimpleSpanProcessor, Resource=resource);
+tp = opentelemetry.sdk.trace.TracerProvider(Resource=resource);
 setTracerProvider(tp);
 
 % set up global propagator

examples/trace/trace_example.m

@@ -42,8 +42,7 @@
 function initTracer
 % set up global TracerProvider
 resource = dictionary("service.name", "OpenTelemetry-Matlab_examples");
-tp = opentelemetry.sdk.trace.TracerProvider(...
-    opentelemetry.sdk.trace.SimpleSpanProcessor, Resource=resource);
+tp = opentelemetry.sdk.trace.TracerProvider(Resource=resource);
 setTracerProvider(tp);
 end
 

examples/webread/matlab/webread_example.m

@@ -27,8 +27,7 @@
 function initTracer
 % set up global TracerProvider
 resource = dictionary("service.name", "OpenTelemetry-Matlab_examples");
-tp = opentelemetry.sdk.trace.TracerProvider(...
-    opentelemetry.sdk.trace.SimpleSpanProcessor, Resource=resource);
+tp = opentelemetry.sdk.trace.TracerProvider(Resource=resource);
 setTracerProvider(tp);
 
 % set up global propagator

test/texamples.m

@@ -370,5 +370,63 @@ function testParallel(testCase)
             verifyLessThanOrEqual(testCase, str2double(worker2.resourceSpans.scopeSpans.spans.endTimeUnixNano), ...
                 str2double(toplevel.resourceSpans.scopeSpans.spans.endTimeUnixNano));
         end
+
+        function testAutoTrace(testCase)
+            % testAutoTrace: AutoTrace example in examples/autotrace folder
+
+            % add the example folder to the path
+            examplefolder = fullfile(fileparts(mfilename('fullpath')), "..", "examples", "autotrace");
+            testCase.applyFixture(matlab.unittest.fixtures.PathFixture(examplefolder));
+
+            % run the example
+            run_example;
+
+            % perform test comparisons
+            results = readJsonResults(testCase);
+            verifyNumElements(testCase, results, 3);
+
+            % check generate_data span
+            gendata = results{1};
+            verifyEqual(testCase, gendata.resourceSpans.scopeSpans.scope.name, 'autotrace_example');
+            verifyEqual(testCase, gendata.resourceSpans.scopeSpans.spans.name, 'generate_data');
+            verifyEqual(testCase, gendata.resourceSpans.scopeSpans.spans.kind, 1);
+            service_name_idx = find(string({gendata.resourceSpans.resource.attributes.key}) == "service.name");
+            verifyNotEmpty(testCase, service_name_idx);
+            verifyEqual(testCase, gendata.resourceSpans.resource.attributes(service_name_idx).value.stringValue, ...
+                'OpenTelemetry-Matlab_examples');
+
+            % check best_fit_line span
+            bestfitline = results{2};
+            verifyEqual(testCase, bestfitline.resourceSpans.scopeSpans.scope.name, 'autotrace_example');
+            verifyEqual(testCase, bestfitline.resourceSpans.scopeSpans.spans.name, 'best_fit_line');
+            verifyEqual(testCase, bestfitline.resourceSpans.scopeSpans.spans.kind, 1);
+
+            % check top level function span
+            toplevel = results{3};
+            verifyEqual(testCase, toplevel.resourceSpans.scopeSpans.scope.name, 'autotrace_example');
+            verifyEqual(testCase, toplevel.resourceSpans.scopeSpans.spans.name, 'autotrace_example');
+            verifyEqual(testCase, toplevel.resourceSpans.scopeSpans.spans.kind, 1);
+
+            % check parent child relationships
+            verifyEqual(testCase, gendata.resourceSpans.scopeSpans.spans.parentSpanId, ...
+                toplevel.resourceSpans.scopeSpans.spans.spanId);
+            verifyEqual(testCase, bestfitline.resourceSpans.scopeSpans.spans.parentSpanId, ...
+                toplevel.resourceSpans.scopeSpans.spans.spanId);
+            verifyEmpty(testCase, toplevel.resourceSpans.scopeSpans.spans.parentSpanId);
+
+            % check all spans belong to the same trace
+            verifyEqual(testCase, gendata.resourceSpans.scopeSpans.spans.traceId, ...
+                toplevel.resourceSpans.scopeSpans.spans.traceId);
+            verifyEqual(testCase, bestfitline.resourceSpans.scopeSpans.spans.traceId, ...
+                toplevel.resourceSpans.scopeSpans.spans.traceId);
+
+            % check for expected timing
+            verifyLessThanOrEqual(testCase, str2double(toplevel.resourceSpans.scopeSpans.spans.startTimeUnixNano), ...
+                str2double(gendata.resourceSpans.scopeSpans.spans.startTimeUnixNano));
+            verifyLessThanOrEqual(testCase, str2double(gendata.resourceSpans.scopeSpans.spans.endTimeUnixNano), ...
+                str2double(bestfitline.resourceSpans.scopeSpans.spans.startTimeUnixNano));
+            verifyLessThanOrEqual(testCase, str2double(bestfitline.resourceSpans.scopeSpans.spans.endTimeUnixNano), ...
+                str2double(toplevel.resourceSpans.scopeSpans.spans.endTimeUnixNano));
+        end
     end
 end