content: package act.metric;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2018 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.app.AppByteCodeScannerBase;
  import act.asm.AnnotationVisitor;
  import act.asm.Type;
  import act.util.ByteCodeVisitor;
  
  public class MetricContextScanner extends AppByteCodeScannerBase {
  
      private static final String DESC_METRIC_CONTEXT = Type.getType(MetricContext.class).getDescriptor();
      private MetricMetaInfoRepo repo;
  
      @Override
      protected void onAppSet() {
          repo = app().metricMetaInfoRepo();
      }
  
      @Override
      protected boolean shouldScan(String className) {
          return true;
      }
  
      @Override
      public ByteCodeVisitor byteCodeVisitor() {
          return new ByteCodeVisitor() {
  
              private String className;
  
              @Override
              public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
                  super.visit(version, access, name, signature, superName, interfaces);
                  className = Type.getObjectType(name).getClassName();
              }
  
              @Override
              public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
                  AnnotationVisitor av = super.visitAnnotation(desc, visible);
                  if (DESC_METRIC_CONTEXT.equals(desc)) {
                      return new AnnotationVisitor(ASM5, av) {
                          @Override
                          public void visit(String name, Object value) {
                              super.visit(name, value);
                              if ("value".equals(name)) {
                                  repo.registerMetricContext(className, value.toString());
                              }
                          }
                      };
                  }
                  return av;
              }
          };
      }
  
      @Override
      public void scanFinished(String className) {
  
      }
  }
  
  