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Reduce the time taken by NetUtil class initialization

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Motivation:

As reported in #2331, some query operations in NetworkInterface takes much longer time than we expected.  For example, specifying -Djava.net.preferIPv4Stack=true option in Window increases the execution time by more than 4 times.  Some Windows systems have more than 20 network interfaces, and this problem gets bigger as the number of unused (virtual) NICs increases.

Modification:

Use NetworkInterface.getInetAddresses() wherever possible.
Before iterating over all NICs reported by NetworkInterface, filter the NICs without proper InetAddresses.  This reduces the number of candidates quite a lot.
NetUtil does not query hardware address of NIC in the first place but uses InetAddress.isLoopbackAddress().
Do not call unnecessary query operations on NetworkInterface.  Just get hardware address and compare.

Result:

Significantly reduced class initialization time
This commit is contained in:
Trustin Lee 2014-03-21 11:39:41 +09:00
parent 13fd69e871
commit feb352c6df
1 changed files with 89 additions and 63 deletions
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138
common/src/main/java/io/netty/util/NetUtil.java
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@ -28,6 +28,7 @@ import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.StringTokenizer;
/**
@ -56,7 +57,7 @@ public final class NetUtil {
public static final InetAddress LOCALHOST;
/**
* The loopback {@link NetworkInterface} on the current machine
* The loopback {@link NetworkInterface} of the current machine
*/
public static final NetworkInterface LOOPBACK_IF;
@ -72,48 +73,13 @@ public final class NetUtil {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(NetUtil.class);
static {
// Find the first loopback interface available.
NetworkInterface loopbackIface = null;
try {
for (Enumeration<NetworkInterface> ifaces = NetworkInterface.getNetworkInterfaces();
ifaces.hasMoreElements();) {
NetworkInterface iface = ifaces.nextElement();
if (iface.isLoopback()) {
// Found
loopbackIface = iface;
break;
}
}
if (loopbackIface == null) {
logger.warn("Failed to find the loopback interface");
}
} catch (SocketException e) {
logger.warn("Failed to find the loopback interface", e);
}
LOOPBACK_IF = loopbackIface;
// Find the localhost address
InetAddress localhost = null;
if (LOOPBACK_IF != null) {
logger.debug("Loopback interface: {}", LOOPBACK_IF.getDisplayName());
for (Enumeration<InetAddress> addrs = LOOPBACK_IF.getInetAddresses();
addrs.hasMoreElements();) {
InetAddress a = addrs.nextElement();
if (localhost == null) {
logger.debug("Loopback address: {} (primary)", a);
localhost = a;
} else {
logger.debug("Loopback address: {}", a);
}
}
}
byte[] LOCALHOST4_BYTES = {127, 0, 0, 1};
byte[] LOCALHOST6_BYTES = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
// Create IPv4 loopback address.
Inet4Address localhost4 = null;
try {
localhost4 = (Inet4Address) InetAddress.getByAddress(new byte[]{127, 0, 0, 1});
localhost4 = (Inet4Address) InetAddress.getByAddress(LOCALHOST4_BYTES);
} catch (Exception e) {
// We should not get here as long as the length of the address is correct.
PlatformDependent.throwException(e);
@ -123,33 +89,96 @@ public final class NetUtil {
// Create IPv6 loopback address.
Inet6Address localhost6 = null;
try {
localhost6 = (Inet6Address) InetAddress.getByAddress(
new byte[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1});
localhost6 = (Inet6Address) InetAddress.getByAddress(LOCALHOST6_BYTES);
} catch (Exception e) {
// We should not get here as long as the length of the address is correct.
PlatformDependent.throwException(e);
}
LOCALHOST6 = localhost6;
// Try to determine the default loopback address if we couldn't yet.
if (localhost == null) {
// Retrieve the list of available network interfaces.
List<NetworkInterface> ifaces = new ArrayList<NetworkInterface>();
try {
for (Enumeration<NetworkInterface> i = NetworkInterface.getNetworkInterfaces(); i.hasMoreElements();) {
NetworkInterface iface = i.nextElement();
// Use the interface with proper INET addresses only.
if (iface.getInetAddresses().hasMoreElements()) {
ifaces.add(iface);
}
}
} catch (SocketException e) {
logger.warn("Failed to retrieve the list of available network interfaces", e);
}
// Find the first loopback interface available from its INET address (127.0.0.1 or ::1)
// Note that we do not use NetworkInterface.isLoopback() in the first place because it takes long time
// on a certain environment. (e.g. Windows with -Djava.net.preferIPv4Stack=true)
NetworkInterface loopbackIface = null;
InetAddress loopbackAddr = null;
loop: for (NetworkInterface iface: ifaces) {
for (Enumeration<InetAddress> i = iface.getInetAddresses(); i.hasMoreElements();) {
InetAddress addr = i.nextElement();
if (addr.isLoopbackAddress()) {
// Found
loopbackIface = iface;
loopbackAddr = addr;
break loop;
}
}
}
// If failed to find the loopback interface from its INET address, fall back to isLoopback().
if (loopbackIface == null) {
try {
for (NetworkInterface iface: ifaces) {
if (iface.isLoopback()) {
Enumeration<InetAddress> i = iface.getInetAddresses();
if (i.hasMoreElements()) {
// Found the one with INET address.
loopbackIface = iface;
loopbackAddr = i.nextElement();
break;
}
}
}
if (loopbackIface == null) {
logger.warn("Failed to find the loopback interface");
}
} catch (SocketException e) {
logger.warn("Failed to find the loopback interface", e);
}
}
if (loopbackIface != null) {
// Found the loopback interface with an INET address.
logger.debug(
"Loopback interface: {} ({}, {})",
loopbackIface.getName(), loopbackIface.getDisplayName(), loopbackAddr.getHostAddress());
} else {
// Could not find the loopback interface, but we can't leave LOCALHOST as null.
// Use LOCALHOST6 or LOCALHOST4, preferably the IPv6 one.
if (loopbackAddr == null) {
try {
if (NetworkInterface.getByInetAddress(LOCALHOST6) != null) {
logger.debug("Using hard-coded IPv6 localhost address: {}", localhost6);
localhost = localhost6;
loopbackAddr = localhost6;
}
} catch (Exception e) {
// Ignore
} finally {
if (localhost == null) {
if (loopbackAddr == null) {
logger.debug("Using hard-coded IPv4 localhost address: {}", localhost4);
localhost = localhost4;
loopbackAddr = localhost4;
}
}
}
}
LOCALHOST = localhost;
LOOPBACK_IF = loopbackIface;
LOCALHOST = loopbackAddr;
// Determine the default somaxconn (server socket backlog) value of the platform.
int somaxconn = 3072;
BufferedReader in = null;
try {
@ -446,7 +475,9 @@ public final class NetUtil {
return false;
}
try {
Integer.parseInt(ipAddress.substring(i + 1));
if (Integer.parseInt(ipAddress.substring(i + 1)) < 0) {
return false;
}
} catch (NumberFormatException e) {
// right now we just support an integer after the % so if
// this is not
@ -506,10 +537,7 @@ public final class NetUtil {
return false;
}
}
if (Integer.parseInt(word) > 255) {
return false;
}
return true;
return Integer.parseInt(word) <= 255;
}
static boolean isValidHexChar(char c) {
@ -560,10 +588,8 @@ public final class NetUtil {
if (word.length() == 0 || Integer.parseInt(word.toString()) > 255) {
return false;
}
if (periods != 3) {
return false;
}
return true;
return periods == 3;
}
/**