1 /* 2 * Copyright (C) 2022 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 android.nearby.fastpair.provider.simulator.testing; 18 19 import com.google.protobuf.ByteString; 20 21 import java.io.IOException; 22 23 /** 24 * Opens input and output data channels, then provides read and write operations to the data 25 * channels. 26 */ 27 public interface StreamIOHandler { 28 /** 29 * Reads stream data from the input channel. 30 * 31 * @return a protocol buffer contains the input message 32 * @throws IOException errors occur when reading the input stream 33 */ read()34 ByteString read() throws IOException; 35 36 /** 37 * Writes stream data to the output channel. 38 * 39 * @param output a protocol buffer contains the output message 40 * @throws IOException errors occur when writing the output message to output stream 41 */ write(ByteString output)42 void write(ByteString output) throws IOException; 43 } 44