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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.am;
     18 
     19 import android.content.ContentProvider;
     20 import android.content.ContentValues;
     21 import android.database.Cursor;
     22 import android.net.Uri;
     23 import android.os.Environment;
     24 import android.os.ParcelFileDescriptor;
     25 
     26 import java.io.File;
     27 import java.io.FileNotFoundException;
     28 
     29 public class DumpHeapProvider extends ContentProvider {
     30     static final Object sLock = new Object();
     31     static File sHeapDumpJavaFile;
     32 
     33     static public File getJavaFile() {
     34         synchronized (sLock) {
     35             return sHeapDumpJavaFile;
     36         }
     37     }
     38 
     39     @Override
     40     public boolean onCreate() {
     41         synchronized (sLock) {
     42             File dataDir = Environment.getDataDirectory();
     43             File systemDir = new File(dataDir, "system");
     44             File heapdumpDir = new File(systemDir, "heapdump");
     45             heapdumpDir.mkdir();
     46             sHeapDumpJavaFile = new File(heapdumpDir, "javaheap.bin");
     47         }
     48         return true;
     49     }
     50 
     51     @Override
     52     public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
     53         return null;
     54     }
     55 
     56     @Override
     57     public String getType(Uri uri) {
     58         return "application/octet-stream";
     59     }
     60 
     61     @Override
     62     public Uri insert(Uri uri, ContentValues values) {
     63         return null;
     64     }
     65 
     66     @Override
     67     public int delete(Uri uri, String selection, String[] selectionArgs) {
     68         return 0;
     69     }
     70 
     71     @Override
     72     public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
     73         return 0;
     74     }
     75 
     76     @Override
     77     public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
     78         synchronized (sLock) {
     79             String path = uri.getEncodedPath();
     80             final String tag = Uri.decode(path);
     81             if (tag.equals("/java")) {
     82                 return ParcelFileDescriptor.open(sHeapDumpJavaFile,
     83                         ParcelFileDescriptor.MODE_READ_ONLY);
     84             } else {
     85                 throw new FileNotFoundException("Invalid path for " + uri);
     86             }
     87         }
     88     }
     89 }
     90