Java tutorial
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See the License for the * specific language governing permissions and limitations * under the License. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package org.apache.http.nio.protocol; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import org.apache.http.ConnectionReuseStrategy; import org.apache.http.HttpEntity; import org.apache.http.HttpEntityEnclosingRequest; import org.apache.http.HttpException; import org.apache.http.HttpRequest; import org.apache.http.HttpResponse; import org.apache.http.HttpResponseFactory; import org.apache.http.nio.ContentDecoder; import org.apache.http.nio.ContentEncoder; import org.apache.http.nio.NHttpServerConnection; import org.apache.http.nio.NHttpServiceHandler; import org.apache.http.nio.entity.BufferingNHttpEntity; import org.apache.http.nio.entity.ConsumingNHttpEntity; import org.apache.http.nio.util.ByteBufferAllocator; import org.apache.http.nio.util.HeapByteBufferAllocator; import org.apache.http.params.HttpParams; import org.apache.http.protocol.HttpContext; import org.apache.http.protocol.HttpExpectationVerifier; import org.apache.http.protocol.HttpProcessor; import org.apache.http.protocol.HttpRequestHandler; import org.apache.http.protocol.HttpRequestHandlerResolver; /** * Service protocol handler implementations that provide compatibility with * the blocking I/O by storing the full content of HTTP messages in memory. * The {@link HttpRequestHandler#handle(HttpRequest, HttpResponse, HttpContext)} * method will fire only when the entire message content has been read into * an in-memory buffer. Please note that request processing take place the * main I/O thread and therefore individual HTTP request handlers should not * block indefinitely. * <p> * When using this protocol handler {@link HttpEntity}'s content can be * generated / consumed using standard {@link InputStream}/{@link OutputStream} * classes. * <p> * IMPORTANT: This protocol handler should be used only when dealing with HTTP * messages that are known to be limited in length. * * * @since 4.0 */ public class BufferingHttpServiceHandler implements NHttpServiceHandler { private final AsyncNHttpServiceHandler asyncHandler; private HttpRequestHandlerResolver handlerResolver; public BufferingHttpServiceHandler(final HttpProcessor httpProcessor, final HttpResponseFactory responseFactory, final ConnectionReuseStrategy connStrategy, final ByteBufferAllocator allocator, final HttpParams params) { super(); this.asyncHandler = new AsyncNHttpServiceHandler(httpProcessor, responseFactory, connStrategy, allocator, params); this.asyncHandler.setHandlerResolver(new RequestHandlerResolverAdaptor()); } public BufferingHttpServiceHandler(final HttpProcessor httpProcessor, final HttpResponseFactory responseFactory, final ConnectionReuseStrategy connStrategy, final HttpParams params) { this(httpProcessor, responseFactory, connStrategy, new HeapByteBufferAllocator(), params); } public void setEventListener(final EventListener eventListener) { this.asyncHandler.setEventListener(eventListener); } public void setExpectationVerifier(final HttpExpectationVerifier expectationVerifier) { this.asyncHandler.setExpectationVerifier(expectationVerifier); } public void setHandlerResolver(final HttpRequestHandlerResolver handlerResolver) { this.handlerResolver = handlerResolver; } public void connected(final NHttpServerConnection conn) { this.asyncHandler.connected(conn); } public void closed(final NHttpServerConnection conn) { this.asyncHandler.closed(conn); } public void requestReceived(final NHttpServerConnection conn) { this.asyncHandler.requestReceived(conn); } public void inputReady(final NHttpServerConnection conn, final ContentDecoder decoder) { this.asyncHandler.inputReady(conn, decoder); } public void responseReady(final NHttpServerConnection conn) { this.asyncHandler.responseReady(conn); } public void outputReady(final NHttpServerConnection conn, final ContentEncoder encoder) { this.asyncHandler.outputReady(conn, encoder); } public void exception(final NHttpServerConnection conn, final HttpException httpex) { this.asyncHandler.exception(conn, httpex); } public void exception(final NHttpServerConnection conn, final IOException ioex) { this.asyncHandler.exception(conn, ioex); } public void timeout(NHttpServerConnection conn) { this.asyncHandler.timeout(conn); } class RequestHandlerResolverAdaptor implements NHttpRequestHandlerResolver { public NHttpRequestHandler lookup(final String requestURI) { HttpRequestHandler handler = handlerResolver.lookup(requestURI); if (handler != null) { return new RequestHandlerAdaptor(handler); } else { return null; } } } static class RequestHandlerAdaptor extends SimpleNHttpRequestHandler { private final HttpRequestHandler requestHandler; public RequestHandlerAdaptor(final HttpRequestHandler requestHandler) { super(); this.requestHandler = requestHandler; } public ConsumingNHttpEntity entityRequest(final HttpEntityEnclosingRequest request, final HttpContext context) throws HttpException, IOException { return new BufferingNHttpEntity(request.getEntity(), new HeapByteBufferAllocator()); } @Override public void handle(final HttpRequest request, final HttpResponse response, final HttpContext context) throws HttpException, IOException { this.requestHandler.handle(request, response, context); } } }