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 } 71
