SONAR-13590 fix branch+snapshot comparator

3 files changed, 119 insertions, 1 deletions

diff --git a/server/sonar-webserver-core/src/main/java/org/sonar/server/issue/index/AsyncIssueIndexingImpl.java b/server/sonar-webserver-core/src/main/java/org/sonar/server/issue/index/AsyncIssueIndexingImpl.java
index 8fd541c78f3..46aeff7537f 100644
--- a/server/sonar-webserver-core/src/main/java/org/sonar/server/issue/index/AsyncIssueIndexingImpl.java
+++ b/server/sonar-webserver-core/src/main/java/org/sonar/server/issue/index/AsyncIssueIndexingImpl.java
@@ -104,10 +104,13 @@ public class AsyncIssueIndexingImpl implements AsyncIssueIndexing {
     projectUuids.sort(compareBySnapshot(snapshotByProjectUuid));
   }
 
-  private static Comparator<String> compareBySnapshot(Map<String, SnapshotDto> snapshotByProjectUuid) {
+  static Comparator<String> compareBySnapshot(Map<String, SnapshotDto> snapshotByProjectUuid) {
     return (uuid1, uuid2) -> {
       SnapshotDto snapshot1 = snapshotByProjectUuid.get(uuid1);
       SnapshotDto snapshot2 = snapshotByProjectUuid.get(uuid2);
+      if (snapshot1 == null && snapshot2 == null) {
+        return 0;
+      }
       if (snapshot1 == null) {
         return 1;
       }
diff --git a/server/sonar-webserver-core/src/test/java/org/sonar/server/issue/index/AsyncIssueIndexingImplTest.java b/server/sonar-webserver-core/src/test/java/org/sonar/server/issue/index/AsyncIssueIndexingImplTest.java
index c8c25d23fbe..7b00191049e 100644
--- a/server/sonar-webserver-core/src/test/java/org/sonar/server/issue/index/AsyncIssueIndexingImplTest.java
+++ b/server/sonar-webserver-core/src/test/java/org/sonar/server/issue/index/AsyncIssueIndexingImplTest.java
@@ -19,10 +19,13 @@
  */
 package org.sonar.server.issue.index;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import org.junit.Before;
 import org.junit.Rule;
@@ -45,6 +48,7 @@ import org.sonar.db.component.BranchDto;
 import org.sonar.db.component.SnapshotDto;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.Assertions.tuple;
 import static org.mockito.ArgumentMatchers.anyCollection;
 import static org.mockito.Mockito.mock;
@@ -221,6 +225,43 @@ public class AsyncIssueIndexingImplTest {
         tuple("PULL_REQUEST", null, "pr_1"));
   }
 
+  @Test
+  public void verify_comparator_transitivity() {
+    Map<String, SnapshotDto> map = new HashMap<>();
+    map.put("A", new SnapshotDto().setCreatedAt(1L));
+    map.put("B", new SnapshotDto().setCreatedAt(2L));
+    map.put("C", new SnapshotDto().setCreatedAt(-1L));
+    List<String> uuids = new ArrayList<>(map.keySet());
+    uuids.add("D");
+    Comparators.verifyTransitivity(AsyncIssueIndexingImpl.compareBySnapshot(map), uuids);
+  }
+
+  @Test
+  public void trigger_with_lot_of_not_analyzed_project_should_not_raise_exception() {
+    for (int i = 0; i < 100; i++) {
+      BranchDto dto = new BranchDto()
+        .setBranchType(BRANCH)
+        .setKey("branch_" + i)
+        .setUuid("branch_uuid" + i)
+        .setProjectUuid("project_uuid" + i);
+      dbClient.branchDao().insert(dbTester.getSession(), dto);
+      dbTester.commit();
+      insertSnapshot("analysis_" + i, "project_uuid" + i, 1);
+    }
+
+    for (int i = 100; i < 200; i++) {
+      BranchDto dto = new BranchDto()
+        .setBranchType(BRANCH)
+        .setKey("branch_" + i)
+        .setUuid("branch_uuid" + i)
+        .setProjectUuid("project_uuid" + i);
+      dbClient.branchDao().insert(dbTester.getSession(), dto);
+      dbTester.commit();
+    }
+
+    assertThatCode(underTest::triggerOnIndexCreation).doesNotThrowAnyException();
+  }
+
   private SnapshotDto insertSnapshot(String analysisUuid, String projectUuid, long createdAt) {
     SnapshotDto snapshot = new SnapshotDto()
       .setUuid(analysisUuid)
diff --git a/server/sonar-webserver-core/src/test/java/org/sonar/server/issue/index/Comparators.java b/server/sonar-webserver-core/src/test/java/org/sonar/server/issue/index/Comparators.java
new file mode 100644
index 00000000000..0d71657cc00
--- /dev/null
+++ b/server/sonar-webserver-core/src/test/java/org/sonar/server/issue/index/Comparators.java
@@ -0,0 +1,74 @@
+/*
+ * SonarQube
+ * Copyright (C) 2009-2020 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.server.issue.index;
+
+import java.util.Collection;
+import java.util.Comparator;
+
+public final class Comparators {
+
+  /**
+   * Prevent construction.
+   */
+  private Comparators() {
+  }
+
+  /**
+   * Verify that a comparator is transitive.
+   *
+   * @param <T>        the type being compared
+   * @param comparator the comparator to test
+   * @param elements   the elements to test against
+   * @throws AssertionError if the comparator is not transitive
+   */
+  public static <T> void verifyTransitivity(Comparator<T> comparator, Collection<T> elements) {
+    for (T first : elements) {
+      for (T second : elements) {
+        int result1 = comparator.compare(first, second);
+        int result2 = comparator.compare(second, first);
+        if (result1 != -result2) {
+          // Uncomment the following line to step through the failed case
+          // comparator.compare(first, second);
+          throw new AssertionError("compare(" + first + ", " + second + ") == " + result1 +
+            " but swapping the parameters returns " + result2);
+        }
+      }
+    }
+    for (T first : elements) {
+      for (T second : elements) {
+        int firstGreaterThanSecond = comparator.compare(first, second);
+        if (firstGreaterThanSecond <= 0)
+          continue;
+        for (T third : elements) {
+          int secondGreaterThanThird = comparator.compare(second, third);
+          if (secondGreaterThanThird <= 0)
+            continue;
+          int firstGreaterThanThird = comparator.compare(first, third);
+          if (firstGreaterThanThird <= 0) {
+            throw new AssertionError("compare(" + first + ", " + second + ") > 0, " +
+              "compare(" + second + ", " + third + ") > 0, but compare(" + first + ", " + third + ") == " +
+              firstGreaterThanThird);
+          }
+        }
+      }
+    }
+  }
+
+}