Add status bar widget

Author: mustard-mh

components/ide/jetbrains/backend-plugin/src/main/kotlin/io/gitpod/jetbrains/remote/GitpodSystemMetricsFactory.kt

@@ -0,0 +1,24 @@
+// Copyright (c) 2025 Gitpod GmbH. All rights reserved.
+// Licensed under the GNU Affero General Public License (AGPL).
+// See License.AGPL.txt in the project root for license information.
+
+package io.gitpod.jetbrains.remote
+
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.wm.StatusBarWidget
+import com.intellij.openapi.wm.StatusBarWidgetFactory
+
+class GitpodSystemMetricsFactory : StatusBarWidgetFactory {
+    override fun getId(): String = "GitpodSystemMetricsWidget"
+
+    override fun getDisplayName(): String = "Gitpod System Metrics"
+
+    override fun isAvailable(project: Project): Boolean = true
+
+    override fun createWidget(project: Project): StatusBarWidget =
+        GitpodSystemMetricsWidget(project)
+
+    override fun disposeWidget(widget: StatusBarWidget) {
+        widget.dispose()
+    }
+}

components/ide/jetbrains/backend-plugin/src/main/kotlin/io/gitpod/jetbrains/remote/GitpodSystemMetricsWidget.kt

@@ -0,0 +1,58 @@
+// Copyright (c) 2025 Gitpod GmbH. All rights reserved.
+// Licensed under the GNU Affero General Public License (AGPL).
+// See License.AGPL.txt in the project root for license information.
+
+package io.gitpod.jetbrains.remote
+
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.wm.StatusBar
+import com.intellij.openapi.wm.StatusBarWidget
+import com.intellij.openapi.wm.impl.status.MemoryUsagePanel
+import java.awt.event.ActionListener
+import java.lang.management.ManagementFactory
+import javax.swing.Timer
+
+class GitpodSystemMetricsWidget(private val project: Project) : StatusBarWidget {
+    private var updateTimer: Timer? = null
+    private val memoryPanel = MemoryUsagePanel()
+
+    init {
+        startUpdates()
+    }
+
+    private fun startUpdates() {
+        updateTimer = Timer(1000, ActionListener {
+            if (project.isDisposed) {
+                stopUpdates()
+                return@ActionListener
+            }
+            updateMetrics()
+        }).apply { start() }
+    }
+
+    private fun stopUpdates() {
+        updateTimer?.stop()
+        updateTimer = null
+    }
+
+    private fun updateMetrics() {
+        val memoryBean = ManagementFactory.getMemoryMXBean()
+        val usedMemory = memoryBean.heapMemoryUsage.used / (1024 * 1024)
+        val maxMemory = memoryBean.heapMemoryUsage.max / (1024 * 1024)
+        val cpuLoad = ManagementFactory.getOperatingSystemMXBean().systemLoadAverage
+
+        val metrics = "Mem: ${usedMemory}M/${maxMemory}M | CPU: %.1f%%".format(cpuLoad * 100)
+        memoryPanel.text = metrics
+        memoryPanel.parent?.repaint()
+    }
+
+    override fun install(statusBar: StatusBar) {
+        statusBar.addWidget(memoryPanel)
+    }
+
+    override fun dispose() {
+        stopUpdates()
+    }
+
+    override fun ID(): String = "GitpodSystemMetricsWidget"
+}

components/ide/jetbrains/backend-plugin/src/main/resources/META-INF/plugin.xml

@@ -61,6 +61,7 @@
                             client="controller" preload="true"/>
         <gateway.customization.performance id="gitpodMetricsControl" order="before cpuControl"
                                            implementation="io.gitpod.jetbrains.remote.GitpodMetricControlProvider"/>
+        <statusBarWidgetFactory implementation="io.gitpod.jetbrains.remote.GitpodSystemMetricsFactory"/>
     </extensions>
 
     <actions>