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Issue #1262 Avoid reflection in isMappedBuffer

This commit is contained in:
Greg Wilkins 2017-01-17 15:23:26 +11:00
parent 3b49239407
commit 76e9849fcd
2 changed files with 33 additions and 37 deletions
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35
jetty-server/src/main/java/org/eclipse/jetty/server/ResourceCache.java
View File

@ -354,23 +354,36 @@ public class ResourceCache implements HttpContent.Factory
}
}
/* ------------------------------------------------------------ */
protected ByteBuffer getDirectBuffer(Resource resource)
protected ByteBuffer getMappedBuffer(Resource resource)
{
// Only use file mapped buffers for cached resources, otherwise too much virtual memory commitment for
// a non shared resource. Also ignore max buffer size
try
{
if (_useFileMappedBuffer && resource.getFile()!=null && resource.length()<Integer.MAX_VALUE)
return BufferUtil.toMappedBuffer(resource.getFile());
return BufferUtil.toMappedBuffer(resource.getFile());
}
catch(IOException|IllegalArgumentException e)
{
LOG.warn(e);
}
return null;
}
/* ------------------------------------------------------------ */
protected ByteBuffer getDirectBuffer(Resource resource)
{
try
{
return BufferUtil.toBuffer(resource,true);
}
catch(IOException|IllegalArgumentException e)
{
LOG.warn(e);
return null;
}
return null;
}
/* ------------------------------------------------------------ */
@ -595,15 +608,15 @@ public class ResourceCache implements HttpContent.Factory
ByteBuffer buffer = _directBuffer.get();
if (buffer==null)
{
ByteBuffer buffer2=ResourceCache.this.getDirectBuffer(_resource);
if (buffer2==null)
ByteBuffer mapped = ResourceCache.this.getMappedBuffer(_resource);
ByteBuffer direct = mapped==null?ResourceCache.this.getDirectBuffer(_resource):mapped;
if (direct==null)
LOG.warn("Could not load "+this);
else if (_directBuffer.compareAndSet(null,buffer2))
else if (_directBuffer.compareAndSet(null,direct))
{
buffer=buffer2;
if (!BufferUtil.isMappedBuffer(buffer) && _cachedSize.addAndGet(BufferUtil.length(buffer))>_maxCacheSize)
buffer=direct;
if (mapped==null && _cachedSize.addAndGet(BufferUtil.length(buffer))>_maxCacheSize)
shrinkCache();
}
else

35
jetty-util/src/main/java/org/eclipse/jetty/util/BufferUtil.java
View File

@ -913,39 +913,22 @@ public class BufferUtil
}
}
static final Field fdMappedByteBuffer;
static
{
Field fd = null;
try
{
fd=MappedByteBuffer.class.getDeclaredField("fd");
fd.setAccessible(true);
}
catch(Exception e)
{
}
fdMappedByteBuffer=fd;
}
public static boolean isMappedBuffer(ByteBuffer buffer)
{
if (!(buffer instanceof MappedByteBuffer))
return false;
MappedByteBuffer mapped = (MappedByteBuffer) buffer;
if (fdMappedByteBuffer!=null)
try
{
try
{
if (fdMappedByteBuffer.get(mapped) instanceof FileDescriptor)
return true;
}
catch(Exception e)
{
}
}
return false;
// Check if it really is a mapped buffer
mapped.isLoaded();
return true;
}
catch(UnsupportedOperationException e)
{
return false;
}
}