1 files changed, 76 insertions, 0 deletions
diff --git a/devtools/server/actors/process.js b/devtools/server/actors/process.js
new file mode 100644
index 0000000000..2ed2da64c0
--- /dev/null
+++ b/devtools/server/actors/process.js
@@ -0,0 +1,76 @@
+/* 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";
+
+loader.lazyGetter(this, "ppmm", () => {
+  return Cc["@mozilla.org/parentprocessmessagemanager;1"].getService();
+});
+
+class ProcessActorList {
+  constructor() {
+    this._actors = new Map();
+    this._onListChanged = null;
+    this._mustNotify = false;
+    this._hasObserver = false;
+  }
+
+  getList() {
+    const processes = [];
+    for (let i = 0; i < ppmm.childCount; i++) {
+      const mm = ppmm.getChildAt(i);
+      processes.push({
+        // An ID of zero is always used for the parent. It would be nice to fix
+        // this so that the pid is also used for the parent, see bug 1587443.
+        id: mm.isInProcess ? 0 : mm.osPid,
+        parent: mm.isInProcess,
+        // TODO: exposes process message manager on frameloaders in order to compute this
+        tabCount: undefined,
+      });
+    }
+    this._mustNotify = true;
+    this._checkListening();
+
+    return processes;
+  }
+
+  get onListChanged() {
+    return this._onListChanged;
+  }
+
+  set onListChanged(onListChanged) {
+    if (typeof onListChanged !== "function" && onListChanged !== null) {
+      throw new Error("onListChanged must be either a function or null.");
+    }
+    if (onListChanged === this._onListChanged) {
+      return;
+    }
+
+    this._onListChanged = onListChanged;
+    this._checkListening();
+  }
+
+  _checkListening() {
+    if (this._onListChanged !== null && this._mustNotify) {
+      if (!this._hasObserver) {
+        Services.obs.addObserver(this, "ipc:content-created");
+        Services.obs.addObserver(this, "ipc:content-shutdown");
+        this._hasObserver = true;
+      }
+    } else if (this._hasObserver) {
+      Services.obs.removeObserver(this, "ipc:content-created");
+      Services.obs.removeObserver(this, "ipc:content-shutdown");
+      this._hasObserver = false;
+    }
+  }
+
+  observe() {
+    if (this._mustNotify) {
+      this._onListChanged();
+      this._mustNotify = false;
+    }
+  }
+}
+
+exports.ProcessActorList = ProcessActorList;