content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.aries.async.promise.test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  import org.junit.Test;
  import org.osgi.util.promise.Deferred;
  import org.osgi.util.promise.FailedPromisesException;
  import org.osgi.util.promise.Promise;
  import org.osgi.util.promise.Promises;
  
  public class PromisesTest {
  
      @Test
      public void testResolved() throws Exception {
          final Promise<String> promise = Promises.resolved("Resolved");
          assertTrue("Promise resolved", promise.isDone());
          assertEquals("Value matches", "Resolved", promise.getValue());
      }
  
      @Test
      public void testFailed() throws Exception {
          Exception failed = new Exception("Failed");
          final Promise<String> promise = Promises.failed(failed);
          assertTrue("Promise resolved", promise.isDone());
          assertEquals("Value matches", failed, promise.getFailure());
      }
  
      @Test
      public void testLatch() throws Exception {
          testLatch(false, "hello", "world");
          testLatch(true, "hello", "world");
          testLatch(false, "goodbye", "!cruel", "world");
          testLatch(true, "goodbye", "!cruel", "world");
          testLatch(false, "goodbye", "!cruel", "!world");
          testLatch(false);
          testLatch(1, 2);
          testLatch(1, -2, 3);
          testLatch(1, -2, 3, -4);
          testLatch(new Integer[0]);
      }
  
      // T = String
      private void testLatch(boolean preResolve, String... rv) throws Exception {
          @SuppressWarnings("unchecked")
          Deferred<String>[] dv = new Deferred[rv.length];
          @SuppressWarnings("unchecked")
          Promise<String>[] pv = new Promise[rv.length];
  
          for (int i = 0; i < rv.length; i++) {
              dv[i] = new Deferred<String>();
              pv[i] = dv[i].getPromise();
          }
  
          Promise<List<String>> latch = null;
          if (!preResolve) {
              Promise<List<String>> latch2 = Promises.all(pv);
              latch = latch2;
  
              if (rv.length == 0) {
                  assertTrue("latch resolved", latch.isDone());
                  return;
              }
              assertFalse("latch not resolved", latch.isDone());
          }
  
          int nFail = 0;
          for (int i = 0; i < rv.length; i++) {
              String res = rv[i];
              if (res.startsWith("!")) {
                  dv[i].fail(new Exception(res));
                  nFail++;
              } else {
                  dv[i].resolve(res);
              }
          }
  
          if (preResolve) {
              Promise<List<String>> latch2 = Promises.all(pv);
              latch = latch2;
          }
  
          assertTrue("latch resolved", latch.isDone());
  
          if (nFail > 0) {
              @SuppressWarnings({"not thrown", "all"})
              Throwable failure = latch.getFailure();
              assertTrue("failure instanceof FailedPromisesException", failure instanceof FailedPromisesException);
              Collection<Promise<?>> failedPromises = ((FailedPromisesException) failure).getFailedPromises();
              assertEquals("failedPromises size matches", nFail, failedPromises.size());
  
              for (int i = 0; i < rv.length; i++) {
                  Promise<String> promise = pv[i];
                  if (rv[i].startsWith("!")) {
                      assertTrue("failedPromises contains", failedPromises.contains(promise));
                  } else {
                      assertFalse("failedPromises doesn't contain", failedPromises.contains(promise));
                  }
              }
          } else {
              List<String> list = latch.getValue();
              assertEquals("list size matches", rv.length, list.size());
              for (int i = 0; i < rv.length; i++) {
                  assertEquals("list[i] matches", rv[i], list.get(i));
              }
  
              // check list is modifiable
              list.add(0, "new item");
              assertEquals("list modifiable", "new item", list.get(0));
          }
      }
  
      // T = Number
      // S = Integer
      private void testLatch(Integer... rv) throws Exception {
          @SuppressWarnings("unchecked")
          Deferred<Integer>[] dv = new Deferred[rv.length];
  
          List<Promise<Integer>> promises = new ArrayList<Promise<Integer>>();
  
          for (int i = 0; i < rv.length; i++) {
              dv[i] = new Deferred<Integer>();
              promises.add(dv[i].getPromise());
          }
  
          Promise<List<Number>> latch = Promises.all(promises);
          if (rv.length == 0) {
              assertTrue("latch resolved", latch.isDone());
              return;
          }
          assertFalse("latch not resolved", latch.isDone());
  
          int nFail = 0;
          for (int i = 0; i < rv.length; i++) {
              Integer res = rv[i];
              if (res < 0) {
                  dv[i].fail(new Exception("fail" + res));
                  nFail++;
              } else {
                  dv[i].resolve(res);
              }
          }
          assertTrue("latch resolved", latch.isDone());
  
          if (nFail > 0) {
              @SuppressWarnings({"not thrown", "all"})
              Throwable failure = latch.getFailure();
              assertTrue("failure instanceof FailedPromisesException", failure instanceof FailedPromisesException);
              Collection<Promise<?>> failedPromises = ((FailedPromisesException) failure).getFailedPromises();
              assertEquals("failedPromises size matches", nFail, failedPromises.size());
  
              for (int i = 0; i < rv.length; i++) {
                  Promise<Integer> promise = promises.get(i);
                  if (rv[i] < 0) {
                      assertTrue("failedPromises contains", failedPromises.contains(promise));
                  } else {
                      assertFalse("failedPromises doesn't contain", failedPromises.contains(promise));
                  }
              }
          } else {
              List<Number> list = latch.getValue();
              assertEquals("list size matches", rv.length, list.size());
              for (int i = 0; i < rv.length; i++) {
                  assertEquals("list[i] matches", rv[i], list.get(i));
              }
  
              // check list is modifiable
              list.add(0, 3.14);
              assertEquals("list modifiable", 3.14, list.get(0));
          }
      }
  
  
  }
  