1 /* 2 * Copyright (C) 2014 Square, 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 package okio; 17 18 import java.io.IOException; 19 import java.io.InterruptedIOException; 20 import java.util.concurrent.TimeUnit; 21 22 /** 23 * The time that a requested operation is due. If the deadline is reached before 24 * the operation has completed, the operation should be aborted. 25 */ 26 public class Deadline { 27 public static final Deadline NONE = new Deadline() { 28 @Override public Deadline start(long timeout, TimeUnit unit) { 29 throw new UnsupportedOperationException(); 30 } 31 32 @Override public boolean reached() { 33 return false; 34 } 35 }; 36 37 private long deadlineNanos; 38 39 public Deadline() { 40 } 41 42 public Deadline start(long timeout, TimeUnit unit) { 43 deadlineNanos = System.nanoTime() + unit.toNanos(timeout); 44 return this; 45 } 46 47 public boolean reached() { 48 return System.nanoTime() - deadlineNanos >= 0; // Subtract to avoid overflow! 49 } 50 51 public final void throwIfReached() throws IOException { 52 // TODO: a more catchable exception type? 53 if (reached()) throw new IOException("Deadline reached"); 54 55 // If the thread is interrupted, do not proceed with further I/O. 56 if (Thread.interrupted()) throw new InterruptedIOException(); 57 } 58 } 59
