1 files changed, 50 insertions, 0 deletions
diff --git a/impl_core/src/main/java/io/opencensus/implcore/trace/internal/RandomHandler.java b/impl_core/src/main/java/io/opencensus/implcore/trace/internal/RandomHandler.java
new file mode 100644
index 00000000..70be5a90
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+++ b/impl_core/src/main/java/io/opencensus/implcore/trace/internal/RandomHandler.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017, OpenCensus Authors
+ *
+ * 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.
+ */
+
+package io.opencensus.implcore.trace.internal;
+
+import java.security.SecureRandom;
+import java.util.Random;
+import javax.annotation.concurrent.ThreadSafe;
+
+/**
+ * Abstract class to access the current {@link Random}.
+ *
+ * <p>Implementation can have a per thread instance or a single global instance.
+ */
+@ThreadSafe
+public abstract class RandomHandler {
+  /**
+   * Returns the current {@link Random}.
+   *
+   * @return the current {@code Random}.
+   */
+  public abstract Random current();
+
+  /** Implementation of the {@link RandomHandler} using {@link SecureRandom}. */
+  @ThreadSafe
+  public static final class SecureRandomHandler extends RandomHandler {
+    private final Random random = new SecureRandom();
+
+    /** Constructs a new {@link SecureRandomHandler}. */
+    public SecureRandomHandler() {}
+
+    @Override
+    public Random current() {
+      return random;
+    }
+  }
+}