| // Copyright 2016 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.bazel.repository.downloader; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.devtools.build.lib.clock.Clock; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadCompatible; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe; |
| import com.google.devtools.build.lib.events.Event; |
| import com.google.devtools.build.lib.events.ExtendedEventHandler; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| import java.util.Locale; |
| import java.util.concurrent.atomic.AtomicLong; |
| import javax.annotation.WillCloseWhenClosed; |
| |
| /** |
| * Input stream that reports progress on total bytes read as the download progresses. |
| * |
| * <p>This class is not thread safe, but it is safe to message pass its objects between threads. |
| */ |
| @ThreadCompatible |
| final class ProgressInputStream extends InputStream { |
| |
| private static final long PROGRESS_INTERVAL_MS = 200; |
| |
| /** Factory for {@link ProgressInputStream}. */ |
| @ThreadSafe |
| static class Factory { |
| private final Locale locale; |
| private final Clock clock; |
| private final ExtendedEventHandler eventHandler; |
| |
| Factory(Locale locale, Clock clock, ExtendedEventHandler eventHandler) { |
| this.locale = locale; |
| this.clock = clock; |
| this.eventHandler = eventHandler; |
| } |
| |
| InputStream create(@WillCloseWhenClosed InputStream delegate, URL url, URL originalUrl) { |
| return new ProgressInputStream( |
| locale, clock, eventHandler, PROGRESS_INTERVAL_MS, delegate, url, originalUrl); |
| } |
| } |
| |
| private final Locale locale; |
| private final Clock clock; |
| private final ExtendedEventHandler eventHandler; |
| private final InputStream delegate; |
| private final long intervalMs; |
| private final URL url; |
| private final URL originalUrl; |
| private final AtomicLong toto = new AtomicLong(); |
| private final AtomicLong nextEvent; |
| |
| ProgressInputStream( |
| Locale locale, |
| Clock clock, |
| ExtendedEventHandler eventHandler, |
| long intervalMs, |
| InputStream delegate, |
| URL url, |
| URL originalUrl) { |
| Preconditions.checkArgument(intervalMs >= 0); |
| this.locale = locale; |
| this.clock = clock; |
| this.eventHandler = eventHandler; |
| this.intervalMs = intervalMs; |
| this.delegate = delegate; |
| this.url = url; |
| this.originalUrl = originalUrl; |
| this.nextEvent = new AtomicLong(clock.currentTimeMillis() + intervalMs); |
| eventHandler.post(new DownloadProgressEvent(originalUrl, url, 0, false)); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int result = delegate.read(); |
| if (result != -1) { |
| reportProgress(toto.incrementAndGet()); |
| } |
| return result; |
| } |
| |
| @Override |
| public int read(byte[] buffer, int offset, int length) throws IOException { |
| int amount = delegate.read(buffer, offset, length); |
| if (amount > 0) { |
| reportProgress(toto.addAndGet(amount)); |
| } |
| return amount; |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return delegate.available(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| delegate.close(); |
| eventHandler.post(new DownloadProgressEvent(originalUrl, url, toto.get(), true)); |
| } |
| |
| private void reportProgress(long bytesRead) { |
| long now = clock.currentTimeMillis(); |
| if (now < nextEvent.get()) { |
| return; |
| } |
| String via = ""; |
| if (!url.getHost().equals(originalUrl.getHost())) { |
| via = " via " + url.getHost(); |
| } |
| eventHandler.post(new DownloadProgressEvent(originalUrl, url, bytesRead, false)); |
| eventHandler.handle( |
| Event.progress( |
| String.format(locale, "Downloading %s%s: %,d bytes", originalUrl, via, bytesRead))); |
| nextEvent.set(now + intervalMs); |
| } |
| } |