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Change TrafficStats to a new JNI implementation.

Browse Source 
Also change phone's ConnectionStateTrackers to use it directly,
rather than through the INetStat binder interface.

Bug: 2578938
Change-Id: I8858e2609cbec3be845a0ce5178cb03f67e01b41
This commit is contained in:
Dan Egnor
2010-04-07 17:30:50 -07:00
parent 07726310ae
commit eaeb70241c
2 changed files with 180 additions and 155 deletions
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170
core/java/android/net/TrafficStats.java
View File

@@ -23,12 +23,12 @@ import java.io.RandomAccessFile;
import java.io.IOException;
/**
* Class that provides network traffic statistics. These statistics include bytes transmitted and
* received and network packets transmitted and received, over all interfaces, over the mobile
* interface, and on a per-UID basis.
* Class that provides network traffic statistics. These statistics include
* bytes transmitted and received and network packets transmitted and received,
* over all interfaces, over the mobile interface, and on a per-UID basis.
* <p>
* These statistics may not be available on all platforms. If the statistics are not supported
* by this device, {@link #UNSUPPORTED} will be returned.
* These statistics may not be available on all platforms. If the statistics
* are not supported by this device, {@link #UNSUPPORTED} will be returned.
*/
public class TrafficStats {
/**
@@ -36,27 +36,13 @@ public class TrafficStats {
*/
public final static int UNSUPPORTED = -1;
// Logging tag.
private final static String TAG = "trafficstats";
// We pre-create all the File objects so we don't spend a lot of
// CPU at runtime converting from Java Strings to byte[] for the
// kernel calls.
private final static File[] MOBILE_TX_PACKETS = mobileFiles("tx_packets");
private final static File[] MOBILE_RX_PACKETS = mobileFiles("rx_packets");
private final static File[] MOBILE_TX_BYTES = mobileFiles("tx_bytes");
private final static File[] MOBILE_RX_BYTES = mobileFiles("rx_bytes");
private final static File SYS_CLASS_NET_DIR = new File("/sys/class/net");
/**
* Get the total number of packets transmitted through the mobile interface.
*
* @return number of packets. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getMobileTxPackets() {
return getMobileStat(MOBILE_TX_PACKETS);
}
public static native long getMobileTxPackets();
/**
* Get the total number of packets received through the mobile interface.
@@ -64,9 +50,7 @@ public class TrafficStats {
* @return number of packets. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getMobileRxPackets() {
return getMobileStat(MOBILE_RX_PACKETS);
}
public static native long getMobileRxPackets();
/**
* Get the total number of bytes transmitted through the mobile interface.
@@ -74,9 +58,7 @@ public class TrafficStats {
* @return number of bytes. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getMobileTxBytes() {
return getMobileStat(MOBILE_TX_BYTES);
}
public static native long getMobileTxBytes();
/**
* Get the total number of bytes received through the mobile interface.
@@ -84,9 +66,7 @@ public class TrafficStats {
* @return number of bytes. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getMobileRxBytes() {
return getMobileStat(MOBILE_RX_BYTES);
}
public static native long getMobileRxBytes();
/**
* Get the total number of packets sent through all network interfaces.
@@ -94,9 +74,7 @@ public class TrafficStats {
* @return the number of packets. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getTotalTxPackets() {
return getTotalStat("tx_packets");
}
public static native long getTotalTxPackets();
/**
* Get the total number of packets received through all network interfaces.
@@ -104,9 +82,7 @@ public class TrafficStats {
* @return number of packets. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getTotalRxPackets() {
return getTotalStat("rx_packets");
}
public static native long getTotalRxPackets();
/**
* Get the total number of bytes sent through all network interfaces.
@@ -114,9 +90,7 @@ public class TrafficStats {
* @return number of bytes. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getTotalTxBytes() {
return getTotalStat("tx_bytes");
}
public static native long getTotalTxBytes();
/**
* Get the total number of bytes received through all network interfaces.
@@ -124,9 +98,7 @@ public class TrafficStats {
* @return number of bytes. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getTotalRxBytes() {
return getTotalStat("rx_bytes");
}
public static native long getTotalRxBytes();
/**
* Get the number of bytes sent through the network for this UID.
@@ -138,9 +110,7 @@ public class TrafficStats {
* @return number of bytes. If the statistics are not supported by this device,
* {@link #UNSUPPORTED} will be returned.
*/
public static long getUidTxBytes(int uid) {
return getNumberFromFilePath("/proc/uid_stat/" + uid + "/tcp_snd");
}
public static native long getUidTxBytes(int uid);
/**
* Get the number of bytes received through the network for this UID.
@@ -151,115 +121,5 @@ public class TrafficStats {
* @param uid The UID of the process to examine.
* @return number of bytes
*/
public static long getUidRxBytes(int uid) {
return getNumberFromFilePath("/proc/uid_stat/" + uid + "/tcp_rcv");
}
/**
* Returns the array of two possible File locations for a given
* statistic.
*/
private static File[] mobileFiles(String whatStat) {
// Note that we stat them at runtime to see which is
// available, rather than here, to guard against the files
// coming & going later as modules shut down (e.g. airplane
// mode) and whatnot. The runtime stat() isn't expensive compared
// to the previous charset conversion that happened before we
// were reusing File instances.
File[] files = new File[2];
files[0] = new File("/sys/class/net/rmnet0/statistics/" + whatStat);
files[1] = new File("/sys/class/net/ppp0/statistics/" + whatStat);
return files;
}
private static long getTotalStat(String whatStat) {
File netdir = new File("/sys/class/net");
File[] nets = SYS_CLASS_NET_DIR.listFiles();
if (nets == null) {
return UNSUPPORTED;
}
long total = 0;
StringBuffer strbuf = new StringBuffer();
for (File net : nets) {
strbuf.append(net.getPath()).append(File.separator).append("statistics")
.append(File.separator).append(whatStat);
total += getNumberFromFilePath(strbuf.toString());
strbuf.setLength(0);
}
return total;
}
private static long getMobileStat(File[] files) {
for (int i = 0; i < files.length; i++) {
File file = files[i];
if (!file.exists()) {
continue;
}
try {
RandomAccessFile raf = new RandomAccessFile(file, "r");
return getNumberFromFile(raf, file.getAbsolutePath());
} catch (IOException e) {
Log.w(TAG,
"Exception opening TCP statistics file " + file.getAbsolutePath(),
e);
}
}
return UNSUPPORTED;
}
// File will have format <number><newline>
private static long getNumberFromFilePath(String filename) {
RandomAccessFile raf = getFile(filename);
if (raf == null) {
return UNSUPPORTED;
}
return getNumberFromFile(raf, filename);
}
// Private buffer for getNumberFromFile. Safe for re-use because
// getNumberFromFile is synchronized.
private final static byte[] buf = new byte[16];
private static synchronized long getNumberFromFile(RandomAccessFile raf, String filename) {
try {
raf.read(buf);
raf.close();
} catch (IOException e) {
Log.w(TAG, "Exception getting TCP bytes from " + filename, e);
return UNSUPPORTED;
} finally {
if (raf != null) {
try {
raf.close();
} catch (IOException e) {
Log.w(TAG, "Exception closing " + filename, e);
}
}
}
long num = 0L;
for (int i = 0; i < buf.length; i++) {
if (buf[i] < '0' || buf[i] > '9') {
break;
}
num *= 10;
num += buf[i] - '0';
}
return num;
}
private static RandomAccessFile getFile(String filename) {
File f = new File(filename);
if (!f.canRead()) {
return null;
}
try {
return new RandomAccessFile(f, "r");
} catch (IOException e) {
Log.w(TAG, "Exception opening TCP statistics file " + filename, e);
return null;
}
}
public static native long getUidRxBytes(int uid);
}