change SolrServlet from Filter to Servlet

(as no multicore required)
this allows to simplify context/servlet initialization in Jetty init.

source/net/yacy/http/Jetty8HttpServerImpl.java

@@ -32,19 +32,15 @@ import java.net.InetSocketAddress;
 import java.net.NetworkInterface;
 import java.net.SocketException;
 import java.security.KeyStore;
-import java.util.EnumSet;
 import java.util.Enumeration;
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
 
-import javax.servlet.DispatcherType;
-
 import net.yacy.cora.util.ConcurrentLog;
 import net.yacy.http.servlets.GSAsearchServlet;
 import net.yacy.http.servlets.SolrServlet;
 import net.yacy.http.servlets.YaCyDefaultServlet;
 import net.yacy.http.servlets.YaCyProxyServlet;
-import net.yacy.http.servlets.SolrServlet.Servlet404;
 import net.yacy.search.Switchboard;
 import net.yacy.utils.PKCS12Tool;
 
@@ -57,7 +53,6 @@ import org.eclipse.jetty.server.handler.DefaultHandler;
 import org.eclipse.jetty.server.handler.HandlerList;
 import org.eclipse.jetty.server.nio.SelectChannelConnector;
 import org.eclipse.jetty.server.ssl.SslSelectChannelConnector;
-import org.eclipse.jetty.servlet.FilterHolder;
 import org.eclipse.jetty.servlet.ServletContextHandler;
 import org.eclipse.jetty.servlet.ServletHolder;
 import org.eclipse.jetty.util.ssl.SslContextFactory;
@@ -101,13 +96,6 @@ public class Jetty8HttpServerImpl implements YaCyHttpServer {
 
         YacyDomainHandler domainHandler = new YacyDomainHandler();
         domainHandler.setAlternativeResolver(sb.peers);
-        
-        //add SolrServlet
-        ServletContextHandler solrContext = new ServletContextHandler(ServletContextHandler.SESSIONS);
-        solrContext.setContextPath("/solr");       
-        solrContext.addServlet(new ServletHolder(Servlet404.class),"/*");  
-     
-        solrContext.addFilter(new FilterHolder(SolrServlet.class), "/*", EnumSet.of(DispatcherType.REQUEST));
 
         // configure root context
         ServletContextHandler htrootContext = new ServletContextHandler(ServletContextHandler.SESSIONS);
@@ -117,13 +105,14 @@ public class Jetty8HttpServerImpl implements YaCyHttpServer {
         //sholder.setInitParameter("welcomeFile", "index.html"); // default is index.html, welcome.html
         htrootContext.addServlet(sholder,"/*");    
         
+        //add SolrServlet
+        htrootContext.addServlet(SolrServlet.class,"/solr/select");        
+
         // add proxy?url= servlet
-        ServletHolder proxyholder= new ServletHolder(YaCyProxyServlet.class);
-        htrootContext.addServlet(proxyholder,"/proxy.html");
+        htrootContext.addServlet(YaCyProxyServlet.class,"/proxy.html");
         
         // add GSA servlet
-        ServletHolder gsaholder = new ServletHolder (GSAsearchServlet.class);
-        htrootContext.addServlet(gsaholder,"/gsa/search");
+        htrootContext.addServlet(GSAsearchServlet.class,"/gsa/search");
 
         // define list of YaCy specific general handlers
         HandlerList handlers = new HandlerList();
@@ -139,7 +128,6 @@ public class Jetty8HttpServerImpl implements YaCyHttpServer {
         // logic: 1. YaCy handlers are called if request not handled (e.g. proxy) then servlets handle it
         ContextHandlerCollection allrequesthandlers = new ContextHandlerCollection();
         allrequesthandlers.addHandler(context);
-        allrequesthandlers.addHandler(solrContext);
         allrequesthandlers.addHandler(htrootContext);    
         allrequesthandlers.addHandler(new DefaultHandler()); // if not handled by other handler 
         

source/net/yacy/http/servlets/SolrServlet.java

@@ -31,9 +31,6 @@ import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
 
-import javax.servlet.Filter;
-import javax.servlet.FilterChain;
-import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;
@@ -81,8 +78,10 @@ import org.apache.solr.util.FastWriter;
 /*
  * taken from the Solr 3.6.0 code, which is now deprecated;
  * this is now done in Solr 4.x.x with org.apache.solr.servlet.SolrDispatchFilter
+ * implemented as servlet (we don't use multicore)
  */
-public class SolrServlet implements Filter {
+public class SolrServlet extends HttpServlet {
+    private static final long serialVersionUID = 1L;
     
     public final static Map<String, QueryResponseWriter> RESPONSE_WRITER = new HashMap<String, QueryResponseWriter>();
     static {
@@ -102,50 +101,14 @@ public class SolrServlet implements Filter {
         RESPONSE_WRITER.put("gsa", new GSAResponseWriter());
     }
 
-    public SolrServlet() {
-    }
-
-    @Override
-    public void init(FilterConfig config) throws ServletException {
-    }
-
     @Override
-    public void destroy() {
-
-    }
-
-    @Override
-    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
-
-        if (!(request instanceof HttpServletRequest)) {
-            if (chain != null) chain.doFilter(request, response);
-            return;
-        }
+    public void service(ServletRequest request, ServletResponse response) throws IOException, ServletException {
 
         HttpServletRequest hrequest = (HttpServletRequest) request;
         HttpServletResponse hresponse = (HttpServletResponse) response;
         SolrQueryRequest req = null;
 
-        // check if this servlet was called correctly
-        String pathInfo = hrequest.getPathInfo();
-        String path = pathInfo == null ? hrequest.getServletPath() : hrequest.getServletPath() + pathInfo; // should be "/select" after this
-
-        if (!EmbeddedSolrConnector.SELECT.equals(path)) {
-            // this is not for this servlet
-            if (chain != null) chain.doFilter(request, response);
-            return;
-        }
-        if (!EmbeddedSolrConnector.CONTEXT.equals(hrequest.getContextPath())) {
-            // this is not for this servlet
-            if (chain != null) chain.doFilter(request, response);
-            return;
-        }
-
-        // reject POST which is not supported here
         final Method reqMethod = Method.getMethod(hrequest.getMethod());
-        if (reqMethod == null || (reqMethod != Method.GET && reqMethod != Method.HEAD)) {
-            throw new ServletException("Unsupported method: " + hrequest.getMethod());
-        }
         
         Writer out = null;
         try {
@@ -263,15 +226,15 @@ public class SolrServlet implements Filter {
             if (Method.HEAD == reqMethod) {
                 return;
             }
-
-            // write response body
-            if (responseWriter instanceof BinaryResponseWriter) {
-                ((BinaryResponseWriter) responseWriter).write(response.getOutputStream(), req, rsp);
-            } else {
-                out = new FastWriter(new OutputStreamWriter(response.getOutputStream(), UTF8.charset));
-                responseWriter.write(out, req, rsp);
-                out.flush();
-            }
+
+            // write response body
+            if (responseWriter instanceof BinaryResponseWriter) {
+                ((BinaryResponseWriter) responseWriter).write(response.getOutputStream(), req, rsp);
+            } else {
+                out = new FastWriter(new OutputStreamWriter(response.getOutputStream(), UTF8.charset));
+                responseWriter.write(out, req, rsp);
+                out.flush();
+            }
             
         } catch (final Throwable ex) {
             sendError(hresponse, ex);