Dissolve gerrit-httpd top-level directory

Change-Id: I287b29b893c6f561dbbf6fa04dc714b4b7f48d54

java/com/google/gerrit/httpd/RequestMetricsFilter.java

@@ -0,0 +1,104 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.httpd;
+
+import com.google.inject.Inject;
+import com.google.inject.Module;
+import com.google.inject.Singleton;
+import com.google.inject.servlet.ServletModule;
+import java.io.IOException;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpServletResponseWrapper;
+
+@Singleton
+public class RequestMetricsFilter implements Filter {
+  public static Module module() {
+    return new ServletModule() {
+      @Override
+      protected void configureServlets() {
+        filter("/*").through(RequestMetricsFilter.class);
+      }
+    };
+  }
+
+  private final RequestMetrics metrics;
+
+  @Inject
+  RequestMetricsFilter(RequestMetrics metrics) {
+    this.metrics = metrics;
+  }
+
+  @Override
+  public void destroy() {}
+
+  @Override
+  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+      throws IOException, ServletException {
+    Response rsp = new Response((HttpServletResponse) response, metrics);
+
+    chain.doFilter(request, rsp);
+  }
+
+  @Override
+  public void init(FilterConfig cfg) throws ServletException {}
+
+  private static class Response extends HttpServletResponseWrapper {
+    private final RequestMetrics metrics;
+
+    Response(HttpServletResponse response, RequestMetrics metrics) {
+      super(response);
+      this.metrics = metrics;
+    }
+
+    @Override
+    public void sendError(int sc, String msg) throws IOException {
+      status(sc);
+      super.sendError(sc, msg);
+    }
+
+    @Override
+    public void sendError(int sc) throws IOException {
+      status(sc);
+      super.sendError(sc);
+    }
+
+    @Override
+    @Deprecated
+    public void setStatus(int sc, String sm) {
+      status(sc);
+      super.setStatus(sc, sm);
+    }
+
+    @Override
+    public void setStatus(int sc) {
+      status(sc);
+      super.setStatus(sc);
+    }
+
+    private void status(int sc) {
+      if (sc >= SC_BAD_REQUEST) {
+        metrics.errors.increment(sc);
+      } else {
+        metrics.successes.increment(sc);
+      }
+    }
+  }
+}