Richard Uhler | 3524472 | 2015-09-10 16:45:54 -0700 | [diff] [blame^] | 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.ahat; |
| 18 | |
| 19 | import com.android.tools.perflib.heap.ClassObj; |
| 20 | import com.android.tools.perflib.heap.Field; |
| 21 | import com.android.tools.perflib.heap.Instance; |
| 22 | import java.io.File; |
| 23 | import java.io.IOException; |
| 24 | import java.util.Map; |
| 25 | |
| 26 | /** |
| 27 | * The TestDump class is used to get an AhatSnapshot for the test-dump |
| 28 | * program. |
| 29 | */ |
| 30 | public class TestDump { |
| 31 | // It can take on the order of a second to parse and process the test-dump |
| 32 | // hprof. To avoid repeating this overhead for each test case, we cache the |
| 33 | // loaded instance of TestDump and reuse it when possible. In theory the |
| 34 | // test cases should not be able to modify the cached snapshot in a way that |
| 35 | // is visible to other test cases. |
| 36 | private static TestDump mCachedTestDump = null; |
| 37 | |
| 38 | private AhatSnapshot mSnapshot = null; |
| 39 | |
| 40 | /** |
| 41 | * Load the test-dump.hprof file. |
| 42 | * The location of the file is read from the system property |
| 43 | * "ahat.test.dump.hprof", which is expected to be set on the command line. |
| 44 | * For example: |
| 45 | * java -Dahat.test.dump.hprof=test-dump.hprof -jar ahat-tests.jar |
| 46 | * |
| 47 | * An IOException is thrown if there is a failure reading the hprof file. |
| 48 | */ |
| 49 | private TestDump() throws IOException { |
| 50 | String hprof = System.getProperty("ahat.test.dump.hprof"); |
| 51 | mSnapshot = AhatSnapshot.fromHprof(new File(hprof)); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Get the AhatSnapshot for the test dump program. |
| 56 | */ |
| 57 | public AhatSnapshot getAhatSnapshot() { |
| 58 | return mSnapshot; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Return the value of a field in the DumpedStuff instance in the |
| 63 | * snapshot for the test-dump program. |
| 64 | */ |
| 65 | public Object getDumpedThing(String name) { |
| 66 | ClassObj main = mSnapshot.findClass("Main"); |
| 67 | Instance stuff = null; |
| 68 | for (Map.Entry<Field, Object> fields : main.getStaticFieldValues().entrySet()) { |
| 69 | if ("stuff".equals(fields.getKey().getName())) { |
| 70 | stuff = (Instance) fields.getValue(); |
| 71 | } |
| 72 | } |
| 73 | return InstanceUtils.getField(stuff, name); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Get the test dump. |
| 78 | * An IOException is thrown if there is an error reading the test dump hprof |
| 79 | * file. |
| 80 | * To improve performance, this returns a cached instance of the TestDump |
| 81 | * when possible. |
| 82 | */ |
| 83 | public static synchronized TestDump getTestDump() throws IOException { |
| 84 | if (mCachedTestDump == null) { |
| 85 | mCachedTestDump = new TestDump(); |
| 86 | } |
| 87 | return mCachedTestDump; |
| 88 | } |
| 89 | } |