SONAR-8192 use a System2 impl always returning a bigger number

provides bullet proof reliability to unit tests checking updates actually occured by checking the value of the update_at column

1 files changed, 72 insertions, 0 deletions

diff --git a/sonar-plugin-api/src/main/java/org/sonar/api/utils/internal/AlwaysIncreasingSystem2.java b/sonar-plugin-api/src/main/java/org/sonar/api/utils/internal/AlwaysIncreasingSystem2.java
new file mode 100644
index 00000000000..628c608a1ec
--- /dev/null
+++ b/sonar-plugin-api/src/main/java/org/sonar/api/utils/internal/AlwaysIncreasingSystem2.java
@@ -0,0 +1,72 @@
+/*
+ * SonarQube
+ * Copyright (C) 2009-2016 SonarSource SA
+ * mailto:contact 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.api.utils.internal;
+
+import com.google.common.base.Preconditions;
+import java.util.Random;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Supplier;
+import org.sonar.api.utils.System2;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * A subclass of {@link System2} which implementation of {@link System2#now()} always return a bigger value than the
+ * previous returned value.
+ * <p>
+ * This class is intended to be used in Unit tests.
+ * </p>
+ */
+public class AlwaysIncreasingSystem2 extends System2 {
+  private final AtomicLong now;
+  private final long increment;
+
+  private AlwaysIncreasingSystem2(Supplier<Long> initialValueSupplier, long increment) {
+    checkArgument(increment > 0, "increment must be > 0");
+    long initialValue = initialValueSupplier.get();
+    Preconditions.checkArgument(initialValue >= 0, "Initial value must be >= 0");
+    this.now = new AtomicLong();
+    this.increment = increment;
+  }
+
+  public AlwaysIncreasingSystem2(long increment) {
+    this(AlwaysIncreasingSystem2::randomInitialValue, increment);
+  }
+
+  public AlwaysIncreasingSystem2(long initialValue, int increment) {
+    this(() -> initialValue, increment);
+  }
+
+  /**
+   * Values returned by {@link #now()} will start with a random value and increment by 100.
+   */
+  public AlwaysIncreasingSystem2() {
+    this(AlwaysIncreasingSystem2::randomInitialValue, 100);
+  }
+
+  @Override
+  public long now() {
+    return now.addAndGet(increment);
+  }
+
+  private static long randomInitialValue() {
+    return (long) Math.abs(new Random().nextInt(2_000_000));
+  }
+}