feedback

sdk/clientcore/core/src/main/java/io/clientcore/core/http/models/PagedIterable.java

@@ -3,7 +3,7 @@
 
 package io.clientcore.core.http.models;
 
-import io.clientcore.core.util.ClientLogger;
+import io.clientcore.core.instrumentation.logging.ClientLogger;
 
 import java.util.Iterator;
 import java.util.NoSuchElementException;

sdk/clientcore/core/src/main/java/io/clientcore/core/implementation/instrumentation/fallback/FallbackContextPropagator.java

@@ -51,23 +51,28 @@ public <C> InstrumentationContext extract(InstrumentationContext context, C carr
         return context == null ? FallbackSpanContext.INVALID : context;
     }
 
+    /**
+     * Validates the traceparent header according to <a href="https://www.w3.org/TR/trace-context/#traceparent-header-field-values">W3C Trace Context</a>
+     *
+     * @param traceparent the traceparent header value
+     * @return true if the traceparent header is valid, false otherwise
+     */
     private static boolean isValidTraceparent(String traceparent) {
         if (traceparent == null || traceparent.length() != 55) {
             return false;
         }
 
-        // version
-        for (int i = 0; i < 2; i++) {
-            if (traceparent.charAt(i) != '0') {
-                return false;
-            }
-        }
-
-        if (traceparent.charAt(2) != '-') {
+        // valid traceparent format: <version>-<trace-id>-<span-id>-<trace-flags>
+        // version - only 00 is supported
+        if (traceparent.charAt(0) != '0'
+            || traceparent.charAt(1) != '0'
+            || traceparent.charAt(2) != '-'
+            || traceparent.charAt(35) != '-'
+            || traceparent.charAt(52) != '-') {
             return false;
         }
 
-        // trace-id
+        // trace-id - 32 lower case hex characters, all 0 is invalid
         boolean isAllZero = true;
         for (int i = 3; i < 35; i++) {
             char c = traceparent.charAt(i);
@@ -82,11 +87,7 @@ private static boolean isValidTraceparent(String traceparent) {
             return false;
         }
 
-        if (traceparent.charAt(35) != '-') {
-            return false;
-        }
-
-        // span-id
+        // span-id - 16 lower case hex characters, all 0 is invalid
         isAllZero = true;
         for (int i = 36; i < 52; i++) {
             char c = traceparent.charAt(i);
@@ -102,11 +103,7 @@ private static boolean isValidTraceparent(String traceparent) {
             return false;
         }
 
-        if (traceparent.charAt(52) != '-') {
-            return false;
-        }
-
-        // trace-flags
+        // trace-flags - 2 lower case hex characters
         for (int i = 53; i < 55; i++) {
             char c = traceparent.charAt(i);
             if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {

sdk/clientcore/core/src/main/java/io/clientcore/core/implementation/instrumentation/fallback/FallbackSpanContext.java

@@ -12,7 +12,8 @@
 import static io.clientcore.core.implementation.instrumentation.fallback.RandomIdUtils.generateTraceId;
 
 final class FallbackSpanContext implements InstrumentationContext {
-    static final FallbackSpanContext INVALID = new FallbackSpanContext();
+    static final FallbackSpanContext INVALID
+        = new FallbackSpanContext(INVALID_TRACE_ID, INVALID_SPAN_ID, "00", false, Span.noop());
     private final String traceId;
     private final String spanId;
     private final String traceFlags;
@@ -59,14 +60,6 @@ public String getTraceFlags() {
         return traceFlags;
     }
 
-    private FallbackSpanContext() {
-        this.traceId = INVALID_TRACE_ID;
-        this.spanId = INVALID_SPAN_ID;
-        this.traceFlags = "00";
-        this.isValid = false;
-        this.span = Span.noop();
-    }
-
     FallbackSpanContext(String traceId, String spanId, String traceFlags, boolean isValid, Span span) {
         this.traceId = traceId;
         this.spanId = spanId;

sdk/clientcore/core/src/main/java/io/clientcore/core/implementation/instrumentation/fallback/RandomIdUtils.java

@@ -23,7 +23,6 @@ class RandomIdUtils {
     private static final int TRACE_ID_HEX_LENGTH = 32;
     private static final int SPAN_ID_HEX_LENGTH = 16;
     private static final char[] ENCODING = buildEncodingArray();
-    private static final String ALPHABET = "0123456789abcdef";
 
     public static String generateSpanId() {
         long id;
@@ -80,10 +79,11 @@ private static void byteToBase16(byte value, char[] dest, int destOffset) {
     }
 
     private static char[] buildEncodingArray() {
+        String alphabet = "0123456789abcdef";
         char[] encoding = new char[512];
         for (int i = 0; i < 256; ++i) {
-            encoding[i] = ALPHABET.charAt(i >>> 4);
-            encoding[i | 0x100] = ALPHABET.charAt(i & 0xF);
+            encoding[i] = alphabet.charAt(i >>> 4);
+            encoding[i | 0x100] = alphabet.charAt(i & 0xF);
         }
         return encoding;
     }

sdk/clientcore/core/src/main/java/io/clientcore/core/implementation/instrumentation/otel/OTelInitializer.java

@@ -184,7 +184,7 @@ public static void runtimeError(ClientLogger logger, Throwable t) {
      * @return true if OTel is initialized successfully, false otherwise
      */
     public static boolean isInitialized() {
-        return INSTANCE == null || INSTANCE.initialized;
+        return INSTANCE.initialized;
     }
 
 }