🚚 Switch namespace

cloud-services/src/main/java/cloud/commandframework/services/AnnotatedMethodService.java

@@ -0,0 +1,98 @@
+//
+// MIT License
+//
+// Copyright (c) 2020 IntellectualSites
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// 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 OR COPYRIGHT HOLDERS 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.
+//
+package cloud.commandframework.services;
+
+import com.google.common.base.Objects;
+import cloud.commandframework.services.annotations.Order;
+import cloud.commandframework.services.types.Service;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Method;
+
+class AnnotatedMethodService<Context, Result> implements Service<Context, Result> {
+
+    private final ExecutionOrder executionOrder;
+    private final MethodHandle methodHandle;
+    private final Method method;
+    private final Object instance;
+
+    AnnotatedMethodService(@Nonnull final Object instance, @Nonnull final Method method)
+        throws Exception {
+      ExecutionOrder executionOrder = ExecutionOrder.SOON;
+      try {
+        final Order order = method.getAnnotation(Order.class);
+        if (order != null) {
+          executionOrder = order.value();
+        }
+      } catch (final Exception ignored) {
+      }
+      this.instance = instance;
+      this.executionOrder = executionOrder;
+      method.setAccessible(true);
+      this.methodHandle = MethodHandles.lookup().unreflect(method);
+      this.method = method;
+    }
+
+  @Nullable
+  @Override
+  @SuppressWarnings("unchecked")
+  public Result handle(@Nonnull final Context context) {
+    try {
+      return (Result) this.methodHandle.invoke(this.instance, context);
+    } catch (final Throwable throwable) {
+      new IllegalStateException(String
+          .format("Failed to call method service implementation '%s' in class '%s'",
+              method.getName(), instance.getClass().getCanonicalName()), throwable)
+          .printStackTrace();
+    }
+    return null;
+  }
+
+  @Nonnull
+  @Override
+  public ExecutionOrder order() {
+    return this.executionOrder;
+  }
+
+  @Override
+  public boolean equals(final Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    final AnnotatedMethodService<?, ?> that = (AnnotatedMethodService<?, ?>) o;
+    return Objects.equal(this.methodHandle, that.methodHandle);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hashCode(this.methodHandle);
+  }
+
+}