Enhance string cache store

src/main/java/run/halo/app/cache/StringCacheStore.java

 package run.halo.app.cache;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.lang.NonNull;
+import org.springframework.util.Assert;
+import run.halo.app.exception.ServiceException;
+import run.halo.app.utils.JsonUtils;
+
+import java.io.IOException;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
 
 /**
  * String cache store.
@@ -10,4 +19,32 @@ import lombok.extern.slf4j.Slf4j;
 @Slf4j
 public abstract class StringCacheStore extends AbstractCacheStore<String, String> {
 
+    public <T> void putAny(String key, T value) {
+        try {
+            put(key, JsonUtils.objectToJson(value));
+        } catch (JsonProcessingException e) {
+            throw new ServiceException("Failed to convert " + value + " to json", e);
+        }
+    }
+
+    public <T> void putAny(@NonNull String key, @NonNull T value, long timeout, @NonNull TimeUnit timeUnit) {
+        try {
+            put(key, JsonUtils.objectToJson(value), timeout, timeUnit);
+        } catch (JsonProcessingException e) {
+            throw new ServiceException("Failed to convert " + value + " to json", e);
+        }
+    }
+
+    public <T> Optional<T> getAny(String key, Class<T> type) {
+        Assert.notNull(type, "Type must not be null");
+
+        return get(key).map(value -> {
+            try {
+                return JsonUtils.jsonToObject(value, type);
+            } catch (IOException e) {
+                log.error("Failed to convert json to type: " + type.getName(), e);
+                return null;
+            }
+        });
+    }
 }

src/test/java/run/halo/app/utils/JsonUtilsTest.java

+package run.halo.app.utils;
+
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author johnniang
+ * @date 19-4-29
+ */
+public class JsonUtilsTest {
+
+    @Test
+    public void longConvertTest() throws IOException {
+        long num = 10;
+
+        String result = JsonUtils.objectToJson(num);
+
+        assertEquals("10", result);
+
+        num = JsonUtils.jsonToObject("10", Long.class);
+
+        assertEquals(10, num);
+    }
+}
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