From 9b7afa0998062127271320893951dfded32cc22a Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Wed, 10 Apr 2013 22:15:34 +0200
Subject: [PATCH] Add input stream that counts its consumed bandwidth.

---
 .../xdcc/util/io/BandwidthCountingInputStream.java | 128 +++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/xdcc/util/io/BandwidthCountingInputStream.java

diff --git a/src/main/java/net/pterodactylus/xdcc/util/io/BandwidthCountingInputStream.java b/src/main/java/net/pterodactylus/xdcc/util/io/BandwidthCountingInputStream.java
new file mode 100644
index 0000000..5009cda
--- /dev/null
+++ b/src/main/java/net/pterodactylus/xdcc/util/io/BandwidthCountingInputStream.java
@@ -0,0 +1,128 @@
+/*
+ * XdccDownloader - BandwidthCountingInputStream.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.xdcc.util.io;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * An {@link InputStream} that can calculate the bandwidth consumed by its
+ * wrapped input stream.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class BandwidthCountingInputStream extends FilterInputStream {
+
+	/** The accumulating data counter. */
+	private final AccumulatingDataCounter accumulatingDataCounter;
+
+	/**
+	 * Creates a new bandwidth counting input stream.
+	 *
+	 * @param inputStream
+	 * 		The input stream to wrap
+	 */
+	public BandwidthCountingInputStream(InputStream inputStream) {
+		super(inputStream);
+		accumulatingDataCounter = new AccumulatingDataCounter();
+	}
+
+	/**
+	 * Creates a new bandwidth counting input stream.
+	 *
+	 * @param inputStream
+	 * 		The input stream to wrap
+	 * @param maximumLifeTime
+	 * 		The maximum lifetime of the bandwidth counter
+	 * @param timeUnit
+	 * 		The time unit of the lifetime
+	 */
+	public BandwidthCountingInputStream(InputStream inputStream, long maximumLifeTime, TimeUnit timeUnit) {
+		super(inputStream);
+		accumulatingDataCounter = new AccumulatingDataCounter(maximumLifeTime, timeUnit);
+	}
+
+	//
+	// ACTIONS
+	//
+
+	/**
+	 * Returns the current rate of this input stream, averaged over the given
+	 * amount of milliseconds.
+	 *
+	 * @param millis
+	 * 		The number of millis to average the bandwidth over
+	 * @return The current rate of this input stream, in bytes/second
+	 */
+	public long getCurrentRate(long millis) {
+		return accumulatingDataCounter.getCurrentRate(millis);
+	}
+
+	/**
+	 * Returns the overall rate of this input stream, averaged over the total
+	 * lifetime.
+	 *
+	 * @return The overall rate of this input stream, in bytes/second
+	 */
+	public long getOverallRate() {
+		return accumulatingDataCounter.getOverallRate();
+	}
+
+	//
+	// INPUTSTREAM METHODS
+	//
+
+	@Override
+	public int read() throws IOException {
+		int r = super.read();
+		if (r != -1) {
+			accumulatingDataCounter.count(1);
+		}
+		return r;
+	}
+
+	@Override
+	public int read(byte[] buffer) throws IOException {
+		return read(buffer, 0, buffer.length);
+	}
+
+	@Override
+	public int read(byte[] buffer, int offset, int length) throws IOException {
+		int r = super.read(buffer, offset, length);
+		if (r != -1) {
+			accumulatingDataCounter.count(r);
+		}
+		return r;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * <p/>
+	 * This method also {@link AccumulatingDataCounter#stop()}s the bandwidth
+	 * counter; subsequent calls of {@link #getOverallRate()} will always return
+	 * the same value.
+	 */
+	@Override
+	public void close() throws IOException {
+		accumulatingDataCounter.stop();
+		super.close();
+	}
+
+}
-- 
2.7.4