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Accurate NIO constraint level determination for IBM JDK 6

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This commit is contained in:
Trustin Lee 2009-07-09 06:11:32 +00:00
parent 75688a719d
commit 0fa25a96a0
1 changed files with 60 additions and 50 deletions
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110
src/main/java/org/jboss/netty/channel/socket/nio/NioProviderMetadata.java
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@ -29,11 +29,14 @@ import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.spi.SelectorProvider;
import java.util.Set;
import java.util.Map.Entry;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;
@ -57,8 +60,6 @@ class NioProviderMetadata {
private static final String CONSTRAINT_LEVEL_PROPERTY =
"java.nio.channels.spi.constraintLevel";
private static final long AUTODETECTION_TIMEOUT = 7000L;
/**
* 0 - no need to wake up to get / set interestOps (most cases)
* 1 - no need to wake up to get interestOps, but need to wake up to set.
@ -87,26 +88,11 @@ class NioProviderMetadata {
if (constraintLevel < 0) {
constraintLevel = detectConstraintLevelFromSystemProperties();
if (constraintLevel < 0) {
logger.debug(
"Couldn't get the NIO constraint level from the system properties.");
ConstraintLevelAutodetector autodetector =
new ConstraintLevelAutodetector();
try {
constraintLevel = autodetector.autodetectWithTimeout();
} catch (Exception e) {
// Probably because of security manager - try again without
// creating a new thread directly.
constraintLevel = autodetector.autodetectWithoutTimeout();
}
}
if (constraintLevel < 0) {
constraintLevel = 2;
logger.warn(
"Failed to autodetect the NIO constraint level; " +
"using the safest level (2)");
logger.debug(
"Couldn't determine the NIO constraint level from " +
"the system properties; using the safest level (2)");
} else if (constraintLevel != 0) {
logger.info(
"Using the autodetected NIO constraint level: " +
@ -130,6 +116,7 @@ class NioProviderMetadata {
private static int detectConstraintLevelFromSystemProperties() {
String version = SystemPropertyUtil.get("java.specification.version");
String vminfo = SystemPropertyUtil.get("java.vm.info", "");
String os = SystemPropertyUtil.get("os.name");
String vendor = SystemPropertyUtil.get("java.vm.vendor");
String provider;
@ -147,6 +134,12 @@ class NioProviderMetadata {
os = os.toLowerCase();
vendor = vendor.toLowerCase();
System.out.println(version);
System.out.println(vminfo);
System.out.println(os);
System.out.println(vendor);
System.out.println(provider);
// Sun JVM
if (vendor.indexOf("sun") >= 0) {
// Linux
@ -178,41 +171,39 @@ class NioProviderMetadata {
}
// IBM
} else if (vendor.indexOf("ibm") >= 0) {
// Linux
if (os.indexOf("linux") >= 0) {
// Linux or AIX
if (os.indexOf("linux") >= 0 || os.indexOf("aix") >= 0) {
if (version.equals("1.5") || version.matches("^1\\.5\\D.*$")) {
if (provider.equals("sun.nio.ch.PollSelectorProvider")) {
return 1;
}
}
} else if (version.equals("1.6") || version.matches("^1\\.6\\D.*$")) {
// IBM JDK 1.6 has different constraint level for different
// version. The exact version can be determined only by its
// build date.
Pattern datePattern = Pattern.compile(
"(?:^|[^0-9])(" +
"[2-9][0-9]{3}" + // year
"(?:0[1-9]|1[0-2])" + // month
"(?:0[1-9]|[12][0-9]|3[01])" + // day of month
")(?:$|[^0-9])");
// Commented out - the constraint level of IBM JDK 1.6 is
// different between versions.
//
//else if (version.equals("1.6") || version.matches("^1\\.6\\D.*$")) {
// if (provider.equals("sun.nio.ch.EPollSelectorProvider") ||
// provider.equals("sun.nio.ch.PollSelectorProvider")) {
// return 2;
// }
//}
// AIX
} if (os.indexOf("aix") >= 0) {
if (version.equals("1.5") || version.matches("^1\\.5\\D.*$")) {
if (provider.equals("sun.nio.ch.PollSelectorProvider")) {
return 1;
Matcher dateMatcher = datePattern.matcher(vminfo);
if (dateMatcher.find()) {
long dateValue = Long.parseLong(dateMatcher.group(1));
if (dateValue < 20081105L) {
// SR0, 1, and 2
return 2;
} else {
// SR3 and later
if (provider.equals("sun.nio.ch.EPollSelectorProvider")) {
return 0;
} else if (provider.equals("sun.nio.ch.PollSelectorProvider")) {
return 1;
}
}
}
}
// Commented out - the constraint level of IBM JDK 1.6 is
// different between versions.
//
//else if (version.equals("1.6") || version.matches("^1\\.6\\D.*$")) {
// if (provider.equals("sun.nio.ch.EPollSelectorProvider") ||
// provider.equals("sun.nio.ch.PollSelectorProvider")) {
// return 2;
// }
//}
}
// BEA
} else if (vendor.indexOf("bea") >= 0 || vendor.indexOf("oracle") >= 0) {
@ -229,13 +220,17 @@ class NioProviderMetadata {
return 0;
}
}
// Apache Software Foundation
} else if (vendor.indexOf("apache") >= 0) {
if (provider.equals("org.apache.harmony.nio.internal.SelectorProviderImpl")) {
return 1;
}
}
// Others (untested)
return -1;
}
private static final class ConstraintLevelAutodetector {
ConstraintLevelAutodetector() {
@ -267,7 +262,7 @@ class NioProviderMetadata {
for (;;) {
try {
Integer result = resultQueue.poll(AUTODETECTION_TIMEOUT, TimeUnit.MILLISECONDS);
Integer result = resultQueue.poll(10000, TimeUnit.MILLISECONDS);
if (result == null) {
logger.warn("NIO constraint level autodetection timed out.");
return -1;
@ -473,4 +468,19 @@ class NioProviderMetadata {
}
}
}
public static void main(String[] args) throws Exception {
for (Entry<Object, Object> e: System.getProperties().entrySet()) {
System.out.println(e.getKey() + ": " + e.getValue());
}
System.out.println();
System.out.println("Hard-coded Constraint Level: " + CONSTRAINT_LEVEL);
System.out.println(
"Auto-detected Constraint Level: " +
new ConstraintLevelAutodetector().autodetectWithoutTimeout());
}
private NioProviderMetadata() {
// Unused
}
}