Stop statically including IndentingPrintWriter in VCN service

VCN service depends on LocalLog.java and WakeupMessage.java. Previously
VCN service will statically include framework-connectivity-shared-srcs
filegroup that has the two required classes. To avoid name class
conflicts, all classes in this filegroup need to be jarjared.

As results, VCN service will use a jarjared IndentingPrintWriter. During
dumpsys, VcnManagementService#dump will create a IndentingPrintWriter
and pass it to VcnUnderlyingNetworkTemplate#dump. Then because
VcnUnderlyingNetworkTemplate fails to recognize the jarjared class, it
will throw NoSuchMethodError.

This issue only exists when VCN is in the platform. When VCN is built
into Tethering module, a different build architecture is used and this
issue will be gone.

This patch fixes the NoSuchMethodError issue by creating temporary
copies of LocalLog and WakeupMessage and updating VCN service to
statically include them. When VCN modularization is fully done, these
two copies can be removed

Bug: 386225194
Test: atest CtsVcnTestCases && atest FrameworksVcnTests
Test: adb dumpsys vcn_management
Flag: EXEMPT; low risk and small scope bug fix
Change-Id: Ie5c099ac04133093c23f8ef6181bab08d1bf8e4b

4 files changed, 291 insertions, 6 deletions

diff --git a/packages/Vcn/service-b/Android.bp b/packages/Vcn/service-b/Android.bp
index 1370b0678cc5..97574e6e35e3 100644
--- a/packages/Vcn/service-b/Android.bp
+++ b/packages/Vcn/service-b/Android.bp
@@ -39,9 +39,7 @@ java_library {
     name: "connectivity-utils-service-vcn-internal",
     sdk_version: "module_current",
     min_sdk_version: "30",
-    srcs: [
-        ":framework-connectivity-shared-srcs",
-    ],
+    srcs: ["service-utils/**/*.java"],
     libs: [
         "framework-annotations-lib",
         "unsupportedappusage",
diff --git a/packages/Vcn/service-b/service-utils/android/util/LocalLog.java b/packages/Vcn/service-b/service-utils/android/util/LocalLog.java
new file mode 100644
index 000000000000..5955d930aab1
--- /dev/null
+++ b/packages/Vcn/service-b/service-utils/android/util/LocalLog.java
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.util;
+
+import android.compat.annotation.UnsupportedAppUsage;
+import android.os.Build;
+import android.os.SystemClock;
+
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.util.ArrayDeque;
+import java.util.Deque;
+import java.util.Iterator;
+
+/**
+ * @hide
+ */
+// Exported to Mainline modules; cannot use annotations
+// @android.ravenwood.annotation.RavenwoodKeepWholeClass
+// TODO: b/374174952 This is an exact copy of frameworks/base/core/java/android/util/LocalLog.java.
+// This file is only used in "service-connectivity-b-platform" before the VCN modularization flag
+// is fully ramped. When the flag is fully ramped and the development is finalized, this file can
+// be removed.
+public final class LocalLog {
+
+    private final Deque<String> mLog;
+    private final int mMaxLines;
+
+    /**
+     * {@code true} to use log timestamps expressed in local date/time, {@code false} to use log
+     * timestamped expressed with the elapsed realtime clock and UTC system clock. {@code false} is
+     * useful when logging behavior that modifies device time zone or system clock.
+     */
+    private final boolean mUseLocalTimestamps;
+
+    @UnsupportedAppUsage
+    public LocalLog(int maxLines) {
+        this(maxLines, true /* useLocalTimestamps */);
+    }
+
+    public LocalLog(int maxLines, boolean useLocalTimestamps) {
+        mMaxLines = Math.max(0, maxLines);
+        mLog = new ArrayDeque<>(mMaxLines);
+        mUseLocalTimestamps = useLocalTimestamps;
+    }
+
+    @UnsupportedAppUsage
+    public void log(String msg) {
+        if (mMaxLines <= 0) {
+            return;
+        }
+        final String logLine;
+        if (mUseLocalTimestamps) {
+            logLine = LocalDateTime.now() + " - " + msg;
+        } else {
+            logLine = Duration.ofMillis(SystemClock.elapsedRealtime())
+                    + " / " + Instant.now() + " - " + msg;
+        }
+        append(logLine);
+    }
+
+    private synchronized void append(String logLine) {
+        while (mLog.size() >= mMaxLines) {
+            mLog.remove();
+        }
+        mLog.add(logLine);
+    }
+
+    @UnsupportedAppUsage
+    public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+        dump(pw);
+    }
+
+    public synchronized void dump(PrintWriter pw) {
+        dump("", pw);
+    }
+
+    /**
+     * Dumps the content of local log to print writer with each log entry predeced with indent
+     *
+     * @param indent indent that precedes each log entry
+     * @param pw printer writer to write into
+     */
+    public synchronized void dump(String indent, PrintWriter pw) {
+        Iterator<String> itr = mLog.iterator();
+        while (itr.hasNext()) {
+            pw.printf("%s%s\n", indent, itr.next());
+        }
+    }
+
+    public synchronized void reverseDump(FileDescriptor fd, PrintWriter pw, String[] args) {
+        reverseDump(pw);
+    }
+
+    public synchronized void reverseDump(PrintWriter pw) {
+        Iterator<String> itr = mLog.descendingIterator();
+        while (itr.hasNext()) {
+            pw.println(itr.next());
+        }
+    }
+
+    // @VisibleForTesting(otherwise = VisibleForTesting.NONE)
+    public synchronized void clear() {
+        mLog.clear();
+    }
+
+    public static class ReadOnlyLocalLog {
+        private final LocalLog mLog;
+        ReadOnlyLocalLog(LocalLog log) {
+            mLog = log;
+        }
+        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
+        public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+            mLog.dump(pw);
+        }
+        public void dump(PrintWriter pw) {
+            mLog.dump(pw);
+        }
+        public void reverseDump(FileDescriptor fd, PrintWriter pw, String[] args) {
+            mLog.reverseDump(pw);
+        }
+        public void reverseDump(PrintWriter pw) {
+            mLog.reverseDump(pw);
+        }
+    }
+
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
+    public ReadOnlyLocalLog readOnlyLocalLog() {
+        return new ReadOnlyLocalLog(this);
+    }
+}
\ No newline at end of file
diff --git a/packages/Vcn/service-b/service-utils/com/android/internal/util/WakeupMessage.java b/packages/Vcn/service-b/service-utils/com/android/internal/util/WakeupMessage.java
new file mode 100644
index 000000000000..7db62f8e9ffc
--- /dev/null
+++ b/packages/Vcn/service-b/service-utils/com/android/internal/util/WakeupMessage.java
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.util;
+
+import android.app.AlarmManager;
+import android.content.Context;
+import android.os.Handler;
+import android.os.Message;
+
+import com.android.internal.annotations.VisibleForTesting;
+
+ /**
+ * An AlarmListener that sends the specified message to a Handler and keeps the system awake until
+ * the message is processed.
+ *
+ * This is useful when using the AlarmManager direct callback interface to wake up the system and
+ * request that an object whose API consists of messages (such as a StateMachine) perform some
+ * action.
+ *
+ * In this situation, using AlarmManager.onAlarmListener by itself will wake up the system to send
+ * the message, but does not guarantee that the system will be awake until the target object has
+ * processed it. This is because as soon as the onAlarmListener sends the message and returns, the
+ * AlarmManager releases its wakelock and the system is free to go to sleep again.
+ */
+// TODO: b/374174952 This is an exact copy of
+// frameworks/base/core/java/com/android/internal/util/WakeupMessage.java.
+// This file is only used in "service-connectivity-b-platform" before the VCN modularization flag
+// is fully ramped. When the flag is fully ramped and the development is finalized, this file can
+// be removed.
+public class WakeupMessage implements AlarmManager.OnAlarmListener {
+    private final AlarmManager mAlarmManager;
+
+    @VisibleForTesting
+    protected final Handler mHandler;
+    @VisibleForTesting
+    protected final String mCmdName;
+    @VisibleForTesting
+    protected final int mCmd, mArg1, mArg2;
+    @VisibleForTesting
+    protected final Object mObj;
+    private final Runnable mRunnable;
+    private boolean mScheduled;
+
+    public WakeupMessage(Context context, Handler handler,
+            String cmdName, int cmd, int arg1, int arg2, Object obj) {
+        mAlarmManager = getAlarmManager(context);
+        mHandler = handler;
+        mCmdName = cmdName;
+        mCmd = cmd;
+        mArg1 = arg1;
+        mArg2 = arg2;
+        mObj = obj;
+        mRunnable = null;
+    }
+
+    public WakeupMessage(Context context, Handler handler, String cmdName, int cmd, int arg1) {
+        this(context, handler, cmdName, cmd, arg1, 0, null);
+    }
+
+    public WakeupMessage(Context context, Handler handler,
+            String cmdName, int cmd, int arg1, int arg2) {
+        this(context, handler, cmdName, cmd, arg1, arg2, null);
+    }
+
+    public WakeupMessage(Context context, Handler handler, String cmdName, int cmd) {
+        this(context, handler, cmdName, cmd, 0, 0, null);
+    }
+
+    public WakeupMessage(Context context, Handler handler, String cmdName, Runnable runnable) {
+        mAlarmManager = getAlarmManager(context);
+        mHandler = handler;
+        mCmdName = cmdName;
+        mCmd = 0;
+        mArg1 = 0;
+        mArg2 = 0;
+        mObj = null;
+        mRunnable = runnable;
+    }
+
+    private static AlarmManager getAlarmManager(Context context) {
+        return (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
+    }
+
+    /**
+     * Schedule the message to be delivered at the time in milliseconds of the
+     * {@link android.os.SystemClock#elapsedRealtime SystemClock.elapsedRealtime()} clock and wakeup
+     * the device when it goes off. If schedule is called multiple times without the message being
+     * dispatched then the alarm is rescheduled to the new time.
+     */
+    public synchronized void schedule(long when) {
+        mAlarmManager.setExact(
+                AlarmManager.ELAPSED_REALTIME_WAKEUP, when, mCmdName, this, mHandler);
+        mScheduled = true;
+    }
+
+    /**
+     * Cancel all pending messages. This includes alarms that may have been fired, but have not been
+     * run on the handler yet.
+     */
+    public synchronized void cancel() {
+        if (mScheduled) {
+            mAlarmManager.cancel(this);
+            mScheduled = false;
+        }
+    }
+
+    @Override
+    public void onAlarm() {
+        // Once this method is called the alarm has already been fired and removed from
+        // AlarmManager (it is still partially tracked, but only for statistics). The alarm can now
+        // be marked as unscheduled so that it can be rescheduled in the message handler.
+        final boolean stillScheduled;
+        synchronized (this) {
+            stillScheduled = mScheduled;
+            mScheduled = false;
+        }
+        if (stillScheduled) {
+            Message msg;
+            if (mRunnable == null) {
+                msg = mHandler.obtainMessage(mCmd, mArg1, mArg2, mObj);
+            } else {
+                msg = Message.obtain(mHandler, mRunnable);
+            }
+            mHandler.dispatchMessage(msg);
+            msg.recycle();
+        }
+    }
+}
\ No newline at end of file
diff --git a/packages/Vcn/service-b/service-vcn-platform-jarjar-rules.txt b/packages/Vcn/service-b/service-vcn-platform-jarjar-rules.txt
index 36307277b4b9..6ec39d953266 100644
--- a/packages/Vcn/service-b/service-vcn-platform-jarjar-rules.txt
+++ b/packages/Vcn/service-b/service-vcn-platform-jarjar-rules.txt
@@ -1,5 +1,2 @@
-rule android.util.IndentingPrintWriter android.net.vcn.module.repackaged.android.util.IndentingPrintWriter
 rule android.util.LocalLog android.net.vcn.module.repackaged.android.util.LocalLog
-rule com.android.internal.util.IndentingPrintWriter android.net.vcn.module.repackaged.com.android.internal.util.IndentingPrintWriter
-rule com.android.internal.util.MessageUtils android.net.vcn.module.repackaged.com.android.internal.util.MessageUtils
 rule com.android.internal.util.WakeupMessage android.net.vcn.module.repackaged.com.android.internal.util.WakeupMessage
\ No newline at end of file