Support condensed-data directly in JMC

application/org.openjdk.jmc.feature.flightrecorder/feature.xml

@@ -191,4 +191,29 @@
          install-size="0"
          version="0.0.0"
          unpack="false"/>
+   <plugin
+         id="org.openjdk.jmc.flightrecorder.writer"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+   <plugin
+         id="org.openjdk.jmc.flightrecorder.cjfr"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+   <plugin
+         id="me.bechberger.condensed.data"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+   <plugin
+         id="me.bechberger.util.femtojson"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+
 </feature>

application/org.openjdk.jmc.flightrecorder.cjfr/META-INF/MANIFEST.MF

@@ -0,0 +1,21 @@
+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-RequiredExecutionEnvironment: JavaSE-21
+Bundle-Name: Condensed Flight Recording Plug-in
+Bundle-SymbolicName: org.openjdk.jmc.flightrecorder.cjfr;singleton:=true
+Bundle-Version: 10.0.0.qualifier
+Bundle-Vendor: Johannes Bechberger
+Require-Bundle: org.eclipse.ui,
+ org.eclipse.core.runtime,
+ org.openjdk.jmc.flightrecorder,
+ org.openjdk.jmc.flightrecorder.ui,
+ org.openjdk.jmc.flightrecorder.writer,
+ me.bechberger.condensed.data
+Import-Package: org.eclipse.jface.dialogs,
+ org.openjdk.jmc.flightrecorder,
+ org.openjdk.jmc.flightrecorder.internal,
+ org.openjdk.jmc.flightrecorder.ui,
+ me.bechberger.condensed,
+ me.bechberger.jfr
+Bundle-ActivationPolicy: lazy
+Automatic-Module-Name: org.openjdk.jmc.flightrecorder.cjfr

application/org.openjdk.jmc.flightrecorder.cjfr/build.properties

@@ -0,0 +1,5 @@
+source.. = src/main/java/
+output.. = target/classes/
+bin.includes = META-INF/,\
+               plugin.xml,\
+               .

application/org.openjdk.jmc.flightrecorder.cjfr/plugin.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?eclipse version="3.4"?>
+<plugin>
+   <extension
+         point="org.eclipse.ui.editors">
+      <editor
+            class="org.openjdk.jmc.flightrecorder.cjfr.CjfrEditor"
+            extensions="cjfr"
+            icon="platform:/plugin/org.openjdk.jmc.flightrecorder.ui/icons/jfr.png"
+            id="org.openjdk.jmc.flightrecorder.cjfr.CjfrEditor"
+            name="Condensed Flight Recording">
+      </editor>
+   </extension>
+</plugin>

application/org.openjdk.jmc.flightrecorder.cjfr/pom.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+   Copyright (c) 2026, Johannes Bechberger and/or its affiliates. All rights reserved.
+
+   DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+
+   The contents of this file are subject to the terms of either the Universal Permissive License
+   v 1.0 as shown at https://oss.oracle.com/licenses/upl
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.openjdk.jmc</groupId>
+		<artifactId>missioncontrol.application</artifactId>
+		<version>${revision}${changelist}</version>
+	</parent>
+	<artifactId>org.openjdk.jmc.flightrecorder.cjfr</artifactId>
+	<packaging>eclipse-plugin</packaging>
+	<properties>
+		<jmc.config.path>${project.basedir}/../../configuration</jmc.config.path>
+	</properties>
+</project>

application/org.openjdk.jmc.flightrecorder.cjfr/src/main/java/org/openjdk/jmc/flightrecorder/cjfr/CjfrEditor.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2026, Johannes Bechberger and/or its affiliates. All rights reserved.
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The contents of this file are subject to the terms of either the Universal Permissive License
+ * v 1.0 as shown at https://oss.oracle.com/licenses/upl
+ */
+package org.openjdk.jmc.flightrecorder.cjfr;
+
+import org.eclipse.jface.dialogs.ProgressIndicator;
+import org.openjdk.jmc.flightrecorder.ui.JfrEditor;
+import org.openjdk.jmc.flightrecorder.ui.RecordingLoader;
+
+/**
+ * Eclipse editor for .cjfr (condensed JFR) files. Inflates the recording to standard JFR bytes in
+ * memory and hands them to the standard JFR loading machinery.
+ */
+public class CjfrEditor extends JfrEditor {
+
+	public static final String EDITOR_ID = "org.openjdk.jmc.flightrecorder.cjfr.CjfrEditor"; //$NON-NLS-1$
+
+	@Override
+	protected RecordingLoader createRecordingLoader(ProgressIndicator progressIndicator) {
+		return new CjfrRecordingLoader(this, progressIndicator);
+	}
+}

application/org.openjdk.jmc.flightrecorder.cjfr/src/main/java/org/openjdk/jmc/flightrecorder/cjfr/CjfrRecordingLoader.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2026, Johannes Bechberger and/or its affiliates. All rights reserved.
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The contents of this file are subject to the terms of either the Universal Permissive License
+ * v 1.0 as shown at https://oss.oracle.com/licenses/upl
+ */
+package org.openjdk.jmc.flightrecorder.cjfr;
+
+import java.io.BufferedInputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
+import org.eclipse.jface.dialogs.ProgressIndicator;
+import org.openjdk.jmc.flightrecorder.CouldNotLoadRecordingException;
+import org.openjdk.jmc.flightrecorder.JfrLoaderToolkit;
+import org.openjdk.jmc.flightrecorder.internal.EventArrays;
+import org.openjdk.jmc.flightrecorder.ui.FlightRecorderUI;
+import org.openjdk.jmc.flightrecorder.ui.JfrEditor;
+import org.openjdk.jmc.flightrecorder.ui.RecordingLoader;
+
+import me.bechberger.condensed.CondensedInputStream;
+import me.bechberger.jfr.BasicJFRReader;
+import me.bechberger.jfr.WritingJFRReader;
+
+/**
+ * Loads a .cjfr file by inflating it to standard JFR bytes in memory, then delegating to
+ * {@link JfrLoaderToolkit#loadStream}.
+ */
+public class CjfrRecordingLoader extends RecordingLoader {
+
+	public CjfrRecordingLoader(JfrEditor editor, ProgressIndicator ui) {
+		super(editor, ui);
+	}
+
+	@Override
+	protected EventArrays doCreateRecording(File file, Runnable lm) throws CouldNotLoadRecordingException, IOException {
+		if (!file.getName().endsWith(".cjfr")) { //$NON-NLS-1$
+			return super.doCreateRecording(file, lm);
+		}
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		try (CondensedInputStream cin = new CondensedInputStream(new BufferedInputStream(new FileInputStream(file)))) {
+			BasicJFRReader reader = new BasicJFRReader(cin);
+			WritingJFRReader.toJFRStream(reader, baos);
+		}
+		boolean hideExperimentals = !FlightRecorderUI.getDefault().includeExperimentalEventsAndFields();
+		boolean ignoreTruncated = FlightRecorderUI.getDefault().allowIncompleteRecordingFile();
+		boolean showHiddenFrames = shouldShowHiddenFrames();
+		return JfrLoaderToolkit.loadStream(new ByteArrayInputStream(baos.toByteArray()), hideExperimentals,
+				ignoreTruncated, showHiddenFrames);
+	}
+}

application/org.openjdk.jmc.flightrecorder.ui/src/main/java/org/openjdk/jmc/flightrecorder/ui/JfrEditor.java

@@ -142,7 +142,11 @@ public void createPartControl(Composite parent) {
 		resultContainer.addDisposeListener(e -> saveCurrentPageState());
 		ProgressIndicator progressIndicator = CompositeToolkit.createWaitIndicator(toolkit.createComposite(parent),
 				toolkit);
-		new RecordingLoader(this, progressIndicator).schedule();
+		createRecordingLoader(progressIndicator).schedule();
+	}
+
+	protected RecordingLoader createRecordingLoader(ProgressIndicator progressIndicator) {
+		return new RecordingLoader(this, progressIndicator);
 	}
 
 	@Override

application/org.openjdk.jmc.flightrecorder.ui/src/main/java/org/openjdk/jmc/flightrecorder/ui/RecordingLoader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
  * 
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -162,8 +162,7 @@ public void run() {
 		});
 	}
 
-	private EventArrays doCreateRecording(File file, ProgressMonitor lm)
-			throws CouldNotLoadRecordingException, IOException {
+	protected EventArrays doCreateRecording(File file, Runnable lm) throws CouldNotLoadRecordingException, IOException {
 		// FIXME: Can we calculate available memory without resorting to System.gc?
 		System.gc();
 		Runtime runtime = Runtime.getRuntime();
@@ -184,7 +183,7 @@ private EventArrays doCreateRecording(File file, ProgressMonitor lm)
 		if (IOToolkit.isCompressedFile(file)) {
 			file = unzipFile(file);
 		}
-		return loadFromUnzippedFile(file, fileName, lm, availableMemory);
+		return loadFromUnzippedFile(file, fileName, (ProgressMonitor) lm, availableMemory);
 	}
 
 	private static void checkForJRockitRecording(EventArrays events) {
@@ -246,7 +245,7 @@ private EventArrays loadFromUnzippedFile(
 		throw new NotEnoughMemoryException();
 	}
 
-	private boolean shouldShowHiddenFrames() {
+	protected boolean shouldShowHiddenFrames() {
 		return FlightRecorderUI.getDefault().getPreferenceStore()
 				.getBoolean(PreferenceKeys.PROPERTY_STACKTRACE_SHOW_HIDDEN_FRAMES);
 	}

application/pom.xml

@@ -90,6 +90,7 @@
 		<module>org.openjdk.jmc.flightrecorder.pde</module>
 		<module>org.openjdk.jmc.flightrecorder.rules.extensionprovider</module>
 		<module>org.openjdk.jmc.flightrecorder.ui</module>
+		<module>org.openjdk.jmc.flightrecorder.cjfr</module>
 		<module>org.openjdk.jmc.greychart</module>
 		<module>org.openjdk.jmc.greychart.ui</module>
 		<module>org.openjdk.jmc.ide.jdt</module>
@@ -160,6 +161,16 @@
 			<artifactId>flightrecorder.serializers</artifactId>
 			<version>${revision}${changelist}</version>
 		</dependency>
+		<dependency>
+			<groupId>org.openjdk.jmc</groupId>
+			<artifactId>flightrecorder.writer</artifactId>
+			<version>${revision}${changelist}</version>
+		</dependency>
+		<dependency>
+			<groupId>me.bechberger.util</groupId>
+			<artifactId>femtojson</artifactId>
+			<version>0.4.1</version>
+		</dependency>
 		<dependency>
 			<groupId>org.openjdk.jmc</groupId>
 			<artifactId>rjmx.common</artifactId>

core/org.openjdk.jmc.flightrecorder.writer/META-INF/MANIFEST.MF

@@ -5,6 +5,8 @@ Bundle-Name: Mission Control Flight Recorder Writer
 Bundle-SymbolicName: org.openjdk.jmc.flightrecorder.writer;singleton:=true
 Bundle-Version: 10.0.0.qualifier
 Bundle-Vendor: Oracle Corporation
-Export-Package: org.openjdk.jmc.flightrecorder.writer.api
+Export-Package: org.openjdk.jmc.flightrecorder.writer.api,
+ org.openjdk.jmc.flightrecorder.writer,
+ org.openjdk.jmc.flightrecorder.writer.util
 Require-Bundle: org.openjdk.jmc.common;visibility:=reexport
 Automatic-Module-Name: org.openjdk.jmc.flightrecorder.writer

core/org.openjdk.jmc.flightrecorder.writer/src/main/java/org/openjdk/jmc/flightrecorder/writer/MetadataImpl.java

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2021, 2025, Datadog, Inc. All rights reserved.
+ * Copyright (c) 2021, 2026, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2026, Datadog, Inc. All rights reserved.
  *
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -66,6 +66,9 @@ final class MetadataImpl {
 	private static final String DIMENSION_KEY = "dimension";
 	private static final String ANNOTATION_KEY = "annotation";
 	private static final String VAL_1_VALUE = "1";
+	private static final String GMT_OFFSET_KEY = "gmtOffset";
+	private static final String LOCALE_KEY = "locale";
+	private static final long GMT_OFFSET_UNSET = Long.MIN_VALUE;
 
 	private final AtomicLong typeCounter = new AtomicLong(1);
 	private final ConstantPools constantPools;
@@ -75,6 +78,8 @@ final class MetadataImpl {
 	private final Set<ResolvableType> unresolvedTypes = new CopyOnWriteArraySet<>();
 
 	private volatile TypesImpl types;
+	private volatile long regionGmtOffsetMillis = GMT_OFFSET_UNSET;
+	private volatile String regionLocale;
 
 	MetadataImpl(ConstantPools constantPools) {
 		this.constantPools = constantPools;
@@ -106,6 +111,19 @@ private void fillStrings() {
 		storeString(REGION_KEY);
 		storeString(DIMENSION_KEY);
 		storeString(ANNOTATION_KEY);
+		storeString(GMT_OFFSET_KEY);
+		storeString(LOCALE_KEY);
+	}
+
+	void setRegion(long gmtOffsetMillis, String locale) {
+		this.regionGmtOffsetMillis = gmtOffsetMillis;
+		this.regionLocale = locale;
+		if (gmtOffsetMillis != GMT_OFFSET_UNSET) {
+			storeString(Long.toString(gmtOffsetMillis));
+		}
+		if (locale != null) {
+			storeString(locale);
+		}
 	}
 
 	/**
@@ -380,6 +398,17 @@ private void writeMetaEventWithSize(LEB128Writer metaWriter, LEB128Writer writer
 	}
 
 	private void writeRegion(LEB128Writer metaWriter) {
+		if (regionGmtOffsetMillis != GMT_OFFSET_UNSET) {
+			boolean hasLocale = regionLocale != null;
+			int attributes = hasLocale ? 2 : 1;
+			metaWriter.writeInt(stringIndex(REGION_KEY)).writeInt(attributes).writeInt(stringIndex(GMT_OFFSET_KEY))
+					.writeInt(stringIndex(Long.toString(regionGmtOffsetMillis)));
+			if (hasLocale) {
+				metaWriter.writeInt(stringIndex(LOCALE_KEY)).writeInt(stringIndex(regionLocale));
+			}
+			metaWriter.writeInt(0); // 0 child elements
+			return;
+		}
 		metaWriter.writeInt(stringIndex(REGION_KEY)).writeInt(0) // 0 attributes
 				.writeInt(0); // 0 elements
 	}

core/org.openjdk.jmc.flightrecorder.writer/src/main/java/org/openjdk/jmc/flightrecorder/writer/RecordingImpl.java

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2021, 2025, Datadog, Inc. All rights reserved.
+ * Copyright (c) 2021, 2026, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2026, Datadog, Inc. All rights reserved.
  *
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -160,6 +160,10 @@ private void processChunkDataQueue(long pollTimeout, TimeUnit timeUnit) throws I
 		}
 	}
 
+	public void setGmtOffset(long gmtOffsetMillis, String locale) {
+		metadata.setRegion(gmtOffsetMillis, locale);
+	}
+
 	@Override
 	public RecordingImpl rotateChunk() {
 		Chunk chunk = getChunk();

core/org.openjdk.jmc.flightrecorder/META-INF/MANIFEST.MF

@@ -8,7 +8,7 @@ Bundle-Vendor: Oracle Corporation
 Eclipse-BuddyPolicy: app
 Eclipse-ExtensibleAPI: true
 Export-Package: org.openjdk.jmc.flightrecorder,
- org.openjdk.jmc.flightrecorder.internal;x-friends:="org.openjdk.jmc.flightrecorder.ui,org.openjdk.jmc.flightrecorder.configuration",
+ org.openjdk.jmc.flightrecorder.internal;x-friends:="org.openjdk.jmc.flightrecorder.ui,org.openjdk.jmc.flightrecorder.configuration,org.openjdk.jmc.flightrecorder.cjfr",
  org.openjdk.jmc.flightrecorder.internal.util;x-friends:="org.openjdk.jmc.flightrecorder.test",
  org.openjdk.jmc.flightrecorder.jdk,
  org.openjdk.jmc.flightrecorder.memleak,

releng/platform-definitions/platform-definition-2026-06/platform-definition-2026-06.target

@@ -62,6 +62,8 @@
             <unit id="fireplace-swing-animation" version="0.0.1.rc9"/>
             <unit id="radiance-animation" version="8.5.0"/>
             <unit id="org.awaitility" version="4.0.0"/>
+            <unit id="me.bechberger.condensed.data" version="0.1.2"/>
+            <unit id="me.bechberger.util.femtojson" version="0.4.1"/>
             <repository location="http://localhost:8080/site"/>
         </location>
         <location includeAllPlatforms="false" includeConfigurePhase="true" includeMode="planner" includeSource="true" type="InstallableUnit">