Extract ChannelFinder into separate top level classes
This commit is contained in:
Trustin Lee
parent
e55a1f11b5
commit
fe4a8d6dc9
@ -0,0 +1,5 @@
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package io.netty.channel.socket.aio;
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interface AioChannelFinder {
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AbstractAioChannel findChannel(Runnable command) throws Exception;
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}
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@ -15,47 +15,39 @@
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*/
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package io.netty.channel.socket.aio;
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import io.netty.channel.ChannelTaskScheduler;
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import io.netty.channel.EventExecutor;
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import io.netty.channel.EventLoopException;
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import io.netty.channel.MultithreadEventLoopGroup;
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import io.netty.channel.ChannelTaskScheduler;
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import io.netty.logging.InternalLogger;
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import io.netty.logging.InternalLoggerFactory;
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import io.netty.util.internal.DetectionUtil;
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import java.io.IOException;
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import java.lang.reflect.Field;
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import java.nio.channels.AsynchronousChannelGroup;
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import java.util.ArrayDeque;
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import java.util.Collections;
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import java.util.Deque;
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import java.util.List;
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import java.util.concurrent.AbstractExecutorService;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.TimeUnit;
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import sun.misc.Unsafe;
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public class AioEventLoopGroup extends MultithreadEventLoopGroup {
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private static final InternalLogger LOGGER = InternalLoggerFactory.getInstance(AioEventLoopGroup.class);
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private static final ChannelFinder CHANNEL_FINDER;
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private static final AioChannelFinder CHANNEL_FINDER;
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static {
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ChannelFinder finder;
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AioChannelFinder finder;
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try {
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// check if Unsafe is present on the classpath
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// and if so try to instance the UnsafeChannelFinder
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// too get the optimal speed.
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if (DetectionUtil.hasUnsafe()) {
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finder = new UnsafeChannelFinder();
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finder = new UnsafeAioChannelFinder();
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} else {
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finder = new ReflectionChannelFinder();
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finder = new DefaultAioChannelFinder();
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}
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} catch (Throwable t) {
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LOGGER.debug("Unable to instance UnsafeChannelFinder fallback to ReflectionChannelFinder", t);
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finder = new ReflectionChannelFinder();
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LOGGER.debug(String.format(
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"Unable to instance the optimal %s implementation - falling back to %s.",
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AioChannelFinder.class.getSimpleName(), DefaultAioChannelFinder.class.getSimpleName()), t);
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finder = new DefaultAioChannelFinder();
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}
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CHANNEL_FINDER = finder;
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}
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@ -145,102 +137,4 @@ public class AioEventLoopGroup extends MultithreadEventLoopGroup {
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}
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}
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}
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interface ChannelFinder {
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AbstractAioChannel findChannel(Runnable command) throws Exception;
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}
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static class ReflectionChannelFinder implements ChannelFinder {
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private static final ConcurrentMap<Class<?>, Field[]> fieldCache = new ConcurrentHashMap<Class<?>, Field[]>();
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private static final Field[] FAILURE = new Field[0];
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@Override
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public AbstractAioChannel findChannel(Runnable command) throws Exception {
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Class<?> commandType = command.getClass();
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Field[] fields = fieldCache.get(commandType);
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if (fields == null) {
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try {
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fields = findFieldSequence(command, new ArrayDeque<Field>(2));
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} catch (Throwable t) {
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// Failed to get the field list
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}
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if (fields == null) {
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fields = FAILURE;
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}
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fieldCache.put(commandType, fields); // No need to use putIfAbsent()
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}
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if (fields == FAILURE) {
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return null;
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}
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final int lastIndex = fields.length - 1;
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for (int i = 0; i < lastIndex; i ++) {
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command = (Runnable) get(fields[i], command);
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}
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return (AbstractAioChannel) get(fields[lastIndex], command);
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}
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private Field[] findFieldSequence(Runnable command, Deque<Field> fields) throws Exception {
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Class<?> commandType = command.getClass();
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for (Field f: commandType.getDeclaredFields()) {
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if (f.getType() == Runnable.class) {
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f.setAccessible(true);
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fields.addLast(f);
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try {
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Field[] ret = findFieldSequence((Runnable) get(f, command), fields);
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if (ret != null) {
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return ret;
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}
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} finally {
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fields.removeLast();
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}
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}
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if (f.getType() == Object.class) {
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f.setAccessible(true);
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fields.addLast(f);
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try {
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Object candidate = get(f, command);
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if (candidate instanceof AbstractAioChannel) {
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return fields.toArray(new Field[fields.size()]);
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}
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} finally {
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fields.removeLast();
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}
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}
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}
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return null;
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}
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protected Object get(Field f, Object command) throws Exception {
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return f.get(command);
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}
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}
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static class UnsafeChannelFinder extends ReflectionChannelFinder {
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private static final Unsafe UNSAFE = getUnsafe();
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@Override
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protected Object get(Field f, Object command) throws Exception {
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// using Unsafe to directly access the field. This should be
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// faster then "pure" reflection
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long offset = UNSAFE.objectFieldOffset(f);
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return UNSAFE.getObject(command, offset);
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}
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private static Unsafe getUnsafe() {
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try {
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Field singleoneInstanceField = Unsafe.class.getDeclaredField("theUnsafe");
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singleoneInstanceField.setAccessible(true);
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return (Unsafe) singleoneInstanceField.get(null);
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} catch (Throwable cause) {
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throw new RuntimeException("Error while obtaining sun.misc.Unsafe", cause);
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}
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}
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}
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}
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@ -0,0 +1,79 @@
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package io.netty.channel.socket.aio;
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import java.lang.reflect.Field;
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import java.util.ArrayDeque;
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import java.util.Deque;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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class DefaultAioChannelFinder implements AioChannelFinder {
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private static final ConcurrentMap<Class<?>, Field[]> fieldCache = new ConcurrentHashMap<Class<?>, Field[]>();
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private static final Field[] FAILURE = new Field[0];
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@Override
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public AbstractAioChannel findChannel(Runnable command) throws Exception {
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Class<?> commandType = command.getClass();
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Field[] fields = fieldCache.get(commandType);
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if (fields == null) {
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try {
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fields = findFieldSequence(command, new ArrayDeque<Field>(2));
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} catch (Throwable t) {
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// Failed to get the field list
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}
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if (fields == null) {
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fields = FAILURE;
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}
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fieldCache.put(commandType, fields); // No need to use putIfAbsent()
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}
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if (fields == FAILURE) {
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return null;
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}
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final int lastIndex = fields.length - 1;
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for (int i = 0; i < lastIndex; i ++) {
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command = (Runnable) get(fields[i], command);
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}
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return (AbstractAioChannel) get(fields[lastIndex], command);
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}
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private Field[] findFieldSequence(Runnable command, Deque<Field> fields) throws Exception {
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Class<?> commandType = command.getClass();
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for (Field f: commandType.getDeclaredFields()) {
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if (f.getType() == Runnable.class) {
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f.setAccessible(true);
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fields.addLast(f);
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try {
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Field[] ret = findFieldSequence((Runnable) get(f, command), fields);
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if (ret != null) {
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return ret;
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}
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} finally {
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fields.removeLast();
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}
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}
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if (f.getType() == Object.class) {
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f.setAccessible(true);
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fields.addLast(f);
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try {
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Object candidate = get(f, command);
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if (candidate instanceof AbstractAioChannel) {
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return fields.toArray(new Field[fields.size()]);
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}
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} finally {
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fields.removeLast();
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}
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}
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}
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return null;
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}
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protected Object get(Field f, Object command) throws Exception {
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return f.get(command);
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}
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}
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@ -0,0 +1,28 @@
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package io.netty.channel.socket.aio;
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import java.lang.reflect.Field;
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import sun.misc.Unsafe;
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@SuppressWarnings("restriction")
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class UnsafeAioChannelFinder extends DefaultAioChannelFinder {
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private static final Unsafe UNSAFE = getUnsafe();
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@Override
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protected Object get(Field f, Object command) throws Exception {
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// using Unsafe to directly access the field. This should be
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// faster then "pure" reflection
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long offset = UNSAFE.objectFieldOffset(f);
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return UNSAFE.getObject(command, offset);
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}
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private static Unsafe getUnsafe() {
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try {
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Field singleoneInstanceField = Unsafe.class.getDeclaredField("theUnsafe");
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singleoneInstanceField.setAccessible(true);
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return (Unsafe) singleoneInstanceField.get(null);
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} catch (Throwable cause) {
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throw new RuntimeException("Error while obtaining sun.misc.Unsafe", cause);
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}
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}
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}
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