feat: Update cache service to use CacheWrapper object

#91 (closed)

core/src/main/java/org/eclipsefoundation/core/model/CacheWrapper.java

+/*********************************************************************
+* Copyright (c) 2023 Eclipse Foundation.
+*
+* This program and the accompanying materials are made
+* available under the terms of the Eclipse Public License 2.0
+* which is available at https://www.eclipse.org/legal/epl-2.0/
+*
+* Author: Zachary Sabourin <zachary.sabourin@eclipse-foundation.org>
+*
+* SPDX-License-Identifier: EPL-2.0
+**********************************************************************/
+package org.eclipsefoundation.core.model;
+
+import java.util.Optional;
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
+import com.google.auto.value.AutoValue;
+
+@AutoValue
+@JsonDeserialize(builder = AutoValue_CacheWrapper.Builder.class)
+public abstract class CacheWrapper<T> {
+
+    public abstract Optional<T> getData();
+
+    public abstract Optional<Class<?>> getErrorType();
+
+    public static <T> Builder<T> builder() {
+        return new AutoValue_CacheWrapper.Builder<T>().setData(Optional.empty()).setErrorType(Optional.empty());
+    }
+
+    @AutoValue.Builder
+    @JsonPOJOBuilder(withPrefix = "set")
+    public abstract static class Builder<T> {
+
+        public abstract Builder<T> setData(Optional<T> data);
+
+        public abstract Builder<T> setErrorType(Optional<Class<?>> clazz);
+
+        public abstract CacheWrapper<T> build();
+    }
+}