content: package com.airhacks.breakr;
  
  /*
   * #%L
   * breakr
   * %%
   * Copyright (C) 2015 Adam Bien
   * %%
   * 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 java.lang.reflect.Method;
  import javax.inject.Inject;
  import javax.interceptor.AroundInvoke;
  import javax.interceptor.InvocationContext;
  
  /**
   * Put the annotation <code>@Interceptors(Breakr.class)</code> on a CDI or EJB
   * <code>@Singleton</code> to activate the call monitoring functionality.
   *
   * @see CloseCircuit
   * @see IgnoreCallsWhen
   * @author airhacks.com
   */
  public class Breakr {
  
      @Inject
      Circuit circuit;
  
      @AroundInvoke
      public Object guard(InvocationContext ic) throws Exception {
          long maxFailures = IgnoreCallsWhen.MAX_FAILURES;
          long maxDuration = IgnoreCallsWhen.TIMEOUT;
          Method method = ic.getMethod();
  
          boolean closeCircuit = method.isAnnotationPresent(CloseCircuit.class);
          if (closeCircuit) {
              this.circuit.reset();
          }
  
          IgnoreCallsWhen configuration = method.
                  getAnnotation(IgnoreCallsWhen.class);
          if (configuration != null) {
              maxFailures = configuration.failures();
              maxDuration = configuration.slowerThanMillis();
          }
          long start = System.currentTimeMillis();
  
          try {
              if (circuit.isOpen(maxFailures)) {
                  return null;
              }
              return ic.proceed();
          } catch (Exception ex) {
              circuit.newException(ex);
              throw ex;
          } finally {
              long duration = System.currentTimeMillis() - start;
              if (duration > maxDuration) {
                  this.circuit.newTimeout(duration);
              }
          }
      }
  
  }
  