Mod Executor

cloth-utils-v1/src/main/java/me/shedaniel/cloth/api/utils/v1/Executor.java

@@ -82,4 +82,8 @@ public static <T> Optional<T> callIfEnv(EnvType env, Supplier<Callable<T>> runna
             }
         return Optional.empty();
     }
+
+    public static ModExecutor getModExecutor(String modid) {
+        return ModExecutor.EXECUTOR_MAP.getOrDefault(modid, new ModExecutor(modid));
+    }
 }

cloth-utils-v1/src/main/java/me/shedaniel/cloth/api/utils/v1/ModExecutor.java

@@ -0,0 +1,94 @@
+/*
+ * This is free and unencumbered software released into the public domain.
+ *
+ * Anyone is free to copy, modify, publish, use, compile, sell, or
+ * distribute this software, either in source code form or as a compiled
+ * binary, for any purpose, commercial or non-commercial, and by any
+ * means.
+ *
+ * In jurisdictions that recognize copyright laws, the author or authors
+ * of this software dedicate any and all copyright interest in the
+ * software to the public domain. We make this dedication for the benefit
+ * of the public at large and to the detriment of our heirs and
+ * successors. We intend this dedication to be an overt act of
+ * relinquishment in perpetuity of all present and future rights to this
+ * software under copyright law.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * For more information, please refer to <http://unlicense.org>
+ */
+
+package me.shedaniel.cloth.api.utils.v1;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.concurrent.Callable;
+import java.util.concurrent.Executor;
+
+import net.fabricmc.loader.api.FabricLoader;
+
+/**
+ * Represents an executor that only runs tasks if a certain mod
+ * is present.
+ *
+ * <p><b>All</b> tasks run on the same thread of the caller</p>
+ */
+public class ModExecutor implements Executor {
+	static final Map<String, ModExecutor> EXECUTOR_MAP = new HashMap<>();
+	private final String modid;
+
+	ModExecutor(String modid) {
+		this.modid = modid;
+		EXECUTOR_MAP.put(modid, this);
+	}
+
+	@Override
+	public void execute(Runnable command) {
+		if (FabricLoader.getInstance().isModLoaded(this.modid)) {
+			command.run();
+		}
+	}
+
+	public <T> Optional<T> submit(Callable<T> task) throws Exception {
+		if (FabricLoader.getInstance().isModLoaded(this.modid)) {
+			return Optional.ofNullable(task.call());
+		}
+
+		return Optional.empty();
+	}
+
+	public <T> Optional<T> submitQuietly(Callable<T> task) {
+		try {
+			return this.submit(task);
+		} catch (Exception e) {
+			throw new RuntimeException("Unexpected exception caught in " + this.toString() , e);
+		}
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) return true;
+		if (!(o instanceof ModExecutor)) return false;
+		ModExecutor that = (ModExecutor) o;
+		return Objects.equals(this.modid, that.modid);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(this.modid);
+	}
+
+	@Override
+	public String toString() {
+		return "ModExecutor{" + "modid='" + this.modid + '\'' + '}';
+	}
+}