Add a basic API for retrieving spark statistics

1 files changed, 53 insertions, 0 deletions

diff --git a/spark-api/src/main/java/me/lucko/spark/api/SparkProvider.java b/spark-api/src/main/java/me/lucko/spark/api/SparkProvider.java
new file mode 100644
index 0000000..a93c27d
--- /dev/null
+++ b/spark-api/src/main/java/me/lucko/spark/api/SparkProvider.java
@@ -0,0 +1,53 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.api;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+/**
+ * Singleton provider for {@link Spark}.
+ */
+public final class SparkProvider {
+
+    private static Spark instance;
+
+    /**
+     * Gets the singleton spark API instance.
+     *
+     * @return the spark API instance
+     */
+    public static @NonNull Spark get() {
+        Spark instance = SparkProvider.instance;
+        if (instance == null) {
+            throw new IllegalStateException("spark has not loaded yet!");
+        }
+        return instance;
+    }
+
+    static void set(Spark impl) {
+        SparkProvider.instance = impl;
+    }
+
+    private SparkProvider() {
+        throw new AssertionError();
+    }
+
+}