| /* |
| * Copyright (C) 2012 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.os.Handler; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| |
| /** |
| * Helper functions for dumping the state of system services. |
| */ |
| public final class DumpUtils { |
| private DumpUtils() { |
| } |
| |
| /** |
| * Helper for dumping state owned by a handler thread. |
| * |
| * Because the caller might be holding an important lock that the handler is |
| * trying to acquire, we use a short timeout to avoid deadlocks. The process |
| * is inelegant but this function is only used for debugging purposes. |
| */ |
| public static void dumpAsync(Handler handler, final Dump dump, PrintWriter pw, |
| final String prefix, long timeout) { |
| final StringWriter sw = new StringWriter(); |
| if (handler.runWithScissors(new Runnable() { |
| @Override |
| public void run() { |
| PrintWriter lpw = new FastPrintWriter(sw); |
| dump.dump(lpw, prefix); |
| lpw.close(); |
| } |
| }, timeout)) { |
| pw.print(sw.toString()); |
| } else { |
| pw.println("... timed out"); |
| } |
| } |
| |
| public interface Dump { |
| void dump(PrintWriter pw, String prefix); |
| } |
| } |