12.0: Fixes #14260 - Improve GZIP performance

jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/gzip/GzipHandler.java

@@ -590,7 +590,9 @@ public boolean handle(Request request, Response response, Callback callback) thr
         if (inflatable && tryInflate || etagMatches)
         {
             // Wrap the request to update the fields and do any inflation
-            request = new GzipRequest(request, inflatable && tryInflate ? getInflateBufferSize() : -1);
+            GzipRequest gzipRequest = new GzipRequest(request, _inflaterPool, inflatable && tryInflate ? getInflateBufferSize() : -1);
+            request = gzipRequest;
+            callback = Callback.from(callback, gzipRequest::destroy);
         }
 
         if (tryDeflate && _vary != null)
@@ -611,9 +613,10 @@ public boolean handle(Request request, Response response, Callback callback) thr
         if (next.handle(request, response, callback))
             return true;
 
-        // If the request was not accepted, destroy any gzipRequest wrapper
+        // If the request was not handled, destroy GzipRequest.
         if (request instanceof GzipRequest gzipRequest)
             gzipRequest.destroy();
+
         return false;
     }
 

jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/gzip/GzipRequest.java

@@ -34,22 +34,19 @@ public class GzipRequest extends Request.Wrapper
 {
     private static final HttpField X_CE_GZIP = new PreEncodedHttpField("X-Content-Encoding", "gzip");
 
-    // TODO: use InflaterPool from somewhere.
-    private static final InflaterPool __inflaterPool = new InflaterPool(-1, true);
-
     private final HttpFields _fields;
     private Decoder _decoder;
     private GzipTransformer _gzipTransformer;
 
-    public GzipRequest(Request request, int inflateBufferSize)
+    public GzipRequest(Request request, InflaterPool inflaterPool, int inflateBufferSize)
     {
         super(request);
         _fields = updateRequestFields(request, inflateBufferSize > 0);
 
         if (inflateBufferSize > 0)
         {
             Components components = getComponents();
-            _decoder = new Decoder(__inflaterPool, components.getByteBufferPool(), inflateBufferSize);
+            _decoder = new Decoder(inflaterPool, components.getByteBufferPool(), inflateBufferSize);
             _gzipTransformer = new GzipTransformer(getWrapped(), _decoder);
         }
     }

jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/handler/gzip/GzipResponseAndCallback.java

@@ -87,34 +87,18 @@ public GzipResponseAndCallback(GzipHandler handler, Request request, Response re
     @Override
     public void succeeded()
     {
-        try
-        {
-            // We need to write nothing here to intercept the committing of the
-            // response and possibly change headers in case write is never called.
-            if (_last)
-                _callback.succeeded();
-            else
-                write(true, null, _callback);
-        }
-        finally
-        {
-            if (getRequest() instanceof GzipRequest gzipRequest)
-                gzipRequest.destroy();
-        }
+        // We need to write nothing here to intercept the committing of the
+        // response and possibly change headers in case write is never called.
+        if (_last)
+            _callback.succeeded();
+        else
+            write(true, null, _callback);
     }
 
     @Override
     public void failed(Throwable x)
     {
-        try
-        {
-            _callback.failed(x);
-        }
-        finally
-        {
-            if (getRequest() instanceof GzipRequest gzipRequest)
-                gzipRequest.destroy();
-        }
+        _callback.failed(x);
     }
 
     @Override

jetty-core/jetty-server/src/test/java/org/eclipse/jetty/server/handler/gzip/GzipHandlerTest.java

@@ -35,6 +35,7 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
+import java.util.zip.Deflater;
 import java.util.zip.GZIPInputStream;
 import java.util.zip.GZIPOutputStream;
 import java.util.zip.Inflater;
@@ -71,8 +72,12 @@
 import org.eclipse.jetty.util.Callback;
 import org.eclipse.jetty.util.Fields;
 import org.eclipse.jetty.util.IO;
+import org.eclipse.jetty.util.Pool;
 import org.eclipse.jetty.util.StringUtil;
 import org.eclipse.jetty.util.component.LifeCycle;
+import org.eclipse.jetty.util.compression.CompressionPool;
+import org.eclipse.jetty.util.compression.DeflaterPool;
+import org.eclipse.jetty.util.compression.InflaterPool;
 import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
 import org.junit.jupiter.api.AfterEach;
@@ -86,6 +91,7 @@
 import org.junit.jupiter.params.provider.ValueSource;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.awaitility.Awaitility.await;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.both;
 import static org.hamcrest.Matchers.contains;
@@ -944,6 +950,10 @@ public void testGzippedRequestPost() throws Exception
 
         assertThat(response.getStatus(), is(200));
         assertThat(response.getContent(), is(data));
+
+        InflaterPool inflaterPool = _gzipHandler.getBean(InflaterPool.class);
+        Pool<CompressionPool<Inflater>.Entry> pool = inflaterPool.getPool();
+        await().atMost(5, TimeUnit.SECONDS).until(pool::getInUseCount, is(0));
     }
 
     @Test
@@ -1307,6 +1317,10 @@ public void testLargeResponse() throws Exception
         {
             assertEquals(CONTENT, new String(Arrays.copyOfRange(bytes, i * CONTENT_BYTES.length, (i + 1) * CONTENT_BYTES.length), StandardCharsets.UTF_8), "chunk " + i);
         }
+
+        DeflaterPool deflaterPool = _gzipHandler.getBean(DeflaterPool.class);
+        Pool<CompressionPool<Deflater>.Entry> pool = deflaterPool.getPool();
+        await().atMost(5, TimeUnit.SECONDS).until(pool::getInUseCount, is(0));
     }
 
     /**