com.sun.grizzly.util.Utils Maven / Gradle / Ivy
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package com.sun.grizzly.util;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Class contains set of useful operations commonly used in the framework
*
* @author Alexey Stashok
* @author Jean-Francois Arcand
*/
public class Utils {
public static boolean VERBOSE_TESTS = false;
/**
* Lookup a {@link Charset} by name.
* Fixes Charset concurrency issue (http://paul.vox.com/library/post/the-mysteries-of-java-character-set-performance.html)
*
* @param charsetName
* @return {@link Charset}
*
* @deprecated use {@link Charsets#lookupCharset(java.lang.String)}
*/
public static Charset lookupCharset(String charsetName) {
return Charsets.lookupCharset(charsetName);
}
/**
* Character translation tables.
*/
private static final byte[] toLower = new byte[256];
/**
* Initialize character translation and type tables.
*/
static {
for (int i = 0; i < 256; i++) {
toLower[i] = (byte) i;
}
for (int lc = 'a'; lc <= 'z'; lc++) {
int uc = lc + 'A' - 'a';
toLower[uc] = (byte) lc;
}
}
public static Selector openSelector() throws IOException {
try {
return Selector.open();
} catch (NullPointerException e) {
// This is a JDK issue http://bugs.sun.com/view_bug.do?bug_id=6427854
// Try 5 times and abort
for (int i = 0; i < 5; i++) {
try {
return Selector.open();
} catch (NullPointerException e2) {
}
}
String msg = e.getMessage();
throw new IOException("Can not open Selector" + (msg == null ? "" : msg));
}
}
/**
* Method reads data from {@link SelectableChannel} to
* {@link ByteBuffer}. If data is not immediately available - channel
* will be reregistered on temporary {@link Selector} and wait maximum
* readTimeout milliseconds for data.
*
* @param channel {@link SelectableChannel} to read data from
* @param byteBuffer {@link ByteBuffer} to store read data to
* @param readTimeout maximum time in millis operation will wait for
* incoming data
* @return number of bytes were read
* @throws IOException if any error was occured during read
*/
public static Result readWithTemporarySelector(SelectableChannel channel,
ByteBuffer byteBuffer, long readTimeout) throws IOException {
int count = 1;
int byteRead = 0;
int preReadInputBBPos = byteBuffer.position();
Selector readSelector = null;
SelectionKey tmpKey = null;
Result r = new Result(0, false);
try {
ReadableByteChannel readableChannel = (ReadableByteChannel) channel;
while (count > 0) {
count = readableChannel.read(byteBuffer);
if (count > -1) {
byteRead += count;
} else if (count == -1 && byteRead == 0) {
byteRead = -1;
}
}
if (byteRead >= 0 && byteBuffer.position() == preReadInputBBPos) {
readSelector = SelectorFactory.getSelector();
if (readSelector == null) {
return r;
}
count = 1;
tmpKey = channel.register(readSelector, SelectionKey.OP_READ);
tmpKey.interestOps(tmpKey.interestOps() | SelectionKey.OP_READ);
int code = readSelector.select(readTimeout);
tmpKey.interestOps(
tmpKey.interestOps() & ~SelectionKey.OP_READ);
if (code == 0) {
return r;
}
while (count > 0) {
count = readableChannel.read(byteBuffer);
if (count > -1) {
byteRead += count;
} else if (count == -1 && byteRead == 0) {
byteRead = -1;
}
}
} else if (byteRead == 0 && byteBuffer.position() != preReadInputBBPos) {
byteRead += byteBuffer.position() - preReadInputBBPos;
}
} finally {
if (tmpKey != null) {
tmpKey.cancel();
}
if (readSelector != null) {
// Bug 6403933
SelectorFactory.selectNowAndReturnSelector(readSelector);
}
}
if (count == -1 || byteRead == -1) {
r.isClosed = true;
}
r.bytesRead = byteRead;
return r;
}
/**
* Return the bytes contained between the startByte and the endByte. The ByteBuffer
* will be left in the state it was before invoking that method, meaning
* its position and limit will be the same.
*
* @param byteBuffer The bytes.
* @param startByte the first byte to look for
* @param endByte the second byte to look for
* @return The byte[] contained between startByte and endByte
*/
public static byte[] extractBytes(ByteBuffer byteBuffer,
byte startByte, byte endByte) {
int curPosition = byteBuffer.position();
int curLimit = byteBuffer.limit();
if (byteBuffer.position() == 0) {
throw new IllegalStateException("Invalid state");
}
byteBuffer.position(0);
byteBuffer.limit(curPosition);
int state = 0;
int start = 0;
int end;
try {
byte c;
// Rule b - try to determine the context-root
while (byteBuffer.hasRemaining()) {
c = byteBuffer.get();
switch (state) {
case 0: // Search for first ' '
if (c == startByte) {
state = 1;
start = byteBuffer.position();
}
break;
case 1:
if (c == endByte) {
end = byteBuffer.position();
byte[] bytes = new byte[end - start];
byteBuffer.position(start);
byteBuffer.limit(end);
byteBuffer.get(bytes);
return bytes;
}
break;
default:
throw new IllegalArgumentException("Unexpected state");
}
}
throw new IllegalStateException("Unexpected state");
} finally {
byteBuffer.limit(curLimit);
byteBuffer.position(curPosition);
}
}
/**
* Specialized utility method: find a sequence of lower case bytes inside
* a ByteBuffer.
*/
public static int findBytes(ByteBuffer byteBuffer, byte[] b) {
int curPosition = byteBuffer.position();
int curLimit = byteBuffer.limit();
if (byteBuffer.position() == 0) {
throw new IllegalStateException("Invalid state");
}
byteBuffer.position(0);
byteBuffer.limit(curPosition);
try {
byte first = b[0];
int start = 0;
int end = curPosition;
// Look for first char
int srcEnd = b.length;
for (int i = start; i <= end - srcEnd; i++) {
if ((toLower[byteBuffer.get(i) & 0xff] & 0xff) != first) {
continue;
}
// found first char, now look for a match
int myPos = i + 1;
for (int srcPos = 1; srcPos < srcEnd; ) {
if ((toLower[byteBuffer.get(myPos++) & 0xff] & 0xff) != b[srcPos++]) {
break;
}
if (srcPos == srcEnd) {
return i - start; // found it
}
}
}
return -1;
} finally {
byteBuffer.limit(curLimit);
byteBuffer.position(curPosition);
}
}
public static int findBytes(final ByteBuffer bb, Pattern pattern) {
final int curPosition = bb.position();
int curLimit = bb.limit();
bb.position(0);
bb.limit(curPosition);
try {
Matcher matcher = pattern.matcher(new MyCharSequence(curPosition, bb));
if (matcher.find()) {
return matcher.start();
}
return -1;
} finally {
bb.limit(curLimit);
bb.position(curPosition);
}
}
public static boolean isDebugVM() {
boolean debugMode = false;
List l = ManagementFactory.getRuntimeMXBean().getInputArguments();
for (String s : l) {
if (s.trim().startsWith("-Xrunjdwp:") || s.contains("jdwp")) {
debugMode = true;
break;
}
}
return debugMode;
}
public static void dumpOut(final Object text) {
if (VERBOSE_TESTS) {
System.out.println(text);
}
}
public static void dumpErr(final Object text) {
if (VERBOSE_TESTS) {
System.err.println(text);
}
}
public static byte[] copy(final byte[] src) {
byte[] copy = null;
if (src != null) {
copy = new byte[src.length];
System.arraycopy(src, 0, copy, 0, src.length);
}
return copy;
}
public static List toHexStrings(byte[] bytes) {
return toHexStrings(bytes, 0, bytes.length);
}
public static List toHexStrings(byte[] bytes, int start, int end) {
List list = new ArrayList();
for (int i = start; i < end; i++) {
list.add(Integer.toHexString(bytes[i] & 0xFF).toUpperCase());
}
return list;
}
private static class MyCharSequence implements CharSequence {
private final int curPosition;
private final ByteBuffer bb;
public MyCharSequence(int curPosition, ByteBuffer bb) {
this.curPosition = curPosition;
this.bb = bb;
}
public int length() {
return curPosition;
}
public char charAt(int index) {
return (char) bb.get(index);
}
public CharSequence subSequence(int start, int end) {
throw new UnsupportedOperationException();
}
}
public static class Result {
public int bytesRead = 0;
public boolean isClosed = false;
public Result(int i, boolean b) {
bytesRead = i;
isClosed = b;
}
}
}
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