Paul Duffin | e236301 | 2015-11-30 16:20:41 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2014 Google Inc. |
| 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.google.caliper.bridge; |
| 18 | |
| 19 | import static com.google.common.base.Preconditions.checkState; |
| 20 | |
| 21 | import com.google.common.io.BaseEncoding; |
| 22 | |
| 23 | import java.io.ByteArrayInputStream; |
| 24 | import java.io.ByteArrayOutputStream; |
| 25 | import java.io.IOException; |
| 26 | import java.io.ObjectInputStream; |
| 27 | import java.io.ObjectOutputStream; |
| 28 | |
| 29 | /** |
| 30 | * Serializes and deserializes WorkerSpecs as base64 encoded strings so they can be passed on the |
| 31 | * command line to the worker. |
| 32 | * |
| 33 | * <p>Java serialization is a appropriate in this usecase because there are no compatibility |
| 34 | * concerns. The messages encoded/decoded by this class are only used to communicate with another |
| 35 | * JVM that is running with the same version of the java classes. Also, it should be lighter weight |
| 36 | * and faster than other common serialization solutions. |
| 37 | */ |
| 38 | public final class CommandLineSerializer { |
| 39 | private CommandLineSerializer() {} |
| 40 | |
| 41 | /** Returns the given serializable object as a base64 encoded String. */ |
| 42 | public static String render(WorkerSpec message) { |
| 43 | ByteArrayOutputStream bytes = new ByteArrayOutputStream(); |
| 44 | try { |
| 45 | ObjectOutputStream out = new ObjectOutputStream(bytes); |
| 46 | out.writeObject(message); |
| 47 | out.close(); |
| 48 | return BaseEncoding.base64().encode(bytes.toByteArray()); |
| 49 | } catch (IOException e) { |
| 50 | throw new RuntimeException(e); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | /** Parses the given base64 encoded string as an object of the given type. */ |
| 55 | public static WorkerSpec parse(String arg) { |
| 56 | try { |
| 57 | ByteArrayInputStream bais = new ByteArrayInputStream(BaseEncoding.base64().decode(arg)); |
| 58 | ObjectInputStream in = new ObjectInputStream(bais); |
| 59 | WorkerSpec instance = (WorkerSpec) in.readObject(); |
| 60 | in.close(); |
| 61 | checkState(bais.read() == -1, |
| 62 | "Message %s contains more than one object.", arg); |
| 63 | return instance; |
| 64 | } catch (IOException e) { |
| 65 | throw new RuntimeException(e); // assertion error? |
| 66 | } catch (ClassNotFoundException e) { |
| 67 | throw new RuntimeException("cannot decode message", e); |
| 68 | } |
| 69 | } |
| 70 | } |