1 files changed, 43 insertions, 0 deletions
diff --git a/devtools/server/actors/resources/jstracer-trace.js b/devtools/server/actors/resources/jstracer-trace.js
new file mode 100644
index 0000000000..0a614fd6a9
--- /dev/null
+++ b/devtools/server/actors/resources/jstracer-trace.js
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+class JSTraceWatcher {
+  /**
+   * Start watching for traces for a given target actor.
+   *
+   * @param TargetActor targetActor
+   *        The target actor from which we should observe
+   * @param Object options
+   *        Dictionary object with following attributes:
+   *        - onAvailable: mandatory function
+   *          This will be called for each resource.
+   */
+  async watch(targetActor, { onAvailable }) {
+    this.#onAvailable = onAvailable;
+  }
+
+  #onAvailable;
+
+  /**
+   * Stop watching for traces
+   */
+  destroy() {
+    // The traces are being emitted by the TracerActor via `emitTraces` method,
+    // we start and stop recording and emitting tracer from this actor.
+    // Watching for JSTRACER_TRACE only allows receiving these trace events.
+  }
+
+  /**
+   * Emit a JSTRACER_TRACE resource.
+   *
+   * This is being called by the Tracer Actor.
+   */
+  emitTraces(traces) {
+    this.#onAvailable(traces);
+  }
+}
+
+module.exports = JSTraceWatcher;