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* ReusableGZIPStreams:

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- Concurrent
      - Workaround for Apache Harmony 5.0M13 Deflater bug
This commit is contained in:
zzz
2010-04-21 17:04:53 +00:00
parent 7c3e4fd947
commit 43b4fe8300
2 changed files with 31 additions and 20 deletions
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26
core/java/src/net/i2p/util/ReusableGZIPInputStream.java
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@ -3,8 +3,8 @@ package net.i2p.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.zip.GZIPOutputStream;
import java.util.concurrent.LinkedBlockingQueue;
import net.i2p.data.DataHelper;
@ -14,16 +14,24 @@ import net.i2p.data.DataHelper;
*
*/
public class ReusableGZIPInputStream extends ResettableGZIPInputStream {
private final static ArrayList _available = new ArrayList(8);
// Apache Harmony 5.0M13 Deflater doesn't work after reset()
private static final boolean ENABLE_CACHING = !System.getProperty("java.vendor").startsWith("Apache");
private static final LinkedBlockingQueue<ReusableGZIPInputStream> _available;
static {
if (ENABLE_CACHING)
_available = new LinkedBlockingQueue(8);
else
_available = null;
}
/**
* Pull a cached instance
*/
public static ReusableGZIPInputStream acquire() {
ReusableGZIPInputStream rv = null;
synchronized (_available) {
if (_available.size() > 0)
rv = (ReusableGZIPInputStream)_available.remove(0);
}
// Apache Harmony 5.0M13 Deflater doesn't work after reset()
if (ENABLE_CACHING)
rv = _available.poll();
if (rv == null) {
rv = new ReusableGZIPInputStream();
}
@ -34,10 +42,8 @@ public class ReusableGZIPInputStream extends ResettableGZIPInputStream {
* state)
*/
public static void release(ReusableGZIPInputStream released) {
synchronized (_available) {
if (_available.size() < 8)
_available.add(released);
}
if (ENABLE_CACHING)
_available.offer(released);
}
private ReusableGZIPInputStream() { super(); }

25
core/java/src/net/i2p/util/ReusableGZIPOutputStream.java
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@ -2,9 +2,9 @@ package net.i2p.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.zip.Deflater;
import java.util.zip.GZIPInputStream;
import java.util.concurrent.LinkedBlockingQueue;
import net.i2p.data.DataHelper;
@ -14,16 +14,23 @@ import net.i2p.data.DataHelper;
*
*/
public class ReusableGZIPOutputStream extends ResettableGZIPOutputStream {
private static final ArrayList _available = new ArrayList(16);
// Apache Harmony 5.0M13 Deflater doesn't work after reset()
private static final boolean ENABLE_CACHING = !System.getProperty("java.vendor").startsWith("Apache");
private static final LinkedBlockingQueue<ReusableGZIPOutputStream> _available;
static {
if (ENABLE_CACHING)
_available = new LinkedBlockingQueue(16);
else
_available = null;
}
/**
* Pull a cached instance
*/
public static ReusableGZIPOutputStream acquire() {
ReusableGZIPOutputStream rv = null;
synchronized (_available) {
if (_available.size() > 0)
rv = (ReusableGZIPOutputStream)_available.remove(0);
}
if (ENABLE_CACHING)
rv = _available.poll();
if (rv == null) {
rv = new ReusableGZIPOutputStream();
}
@ -36,10 +43,8 @@ public class ReusableGZIPOutputStream extends ResettableGZIPOutputStream {
*/
public static void release(ReusableGZIPOutputStream out) {
out.reset();
synchronized (_available) {
if (_available.size() < 16)
_available.add(out);
}
if (ENABLE_CACHING)
_available.offer(out);
}
private ByteArrayOutputStream _buffer = null;