Fix loss precision of long type (#30)

Author: Linary

studio-api/src/main/java/com/baidu/hugegraph/studio/board/model/QueryResult.java

@@ -178,7 +178,6 @@ public void setGraphEdges(List<Edge> edges) {
         this.graph.setEdges(edges);
     }
 
-
     public void setStyles(Map<String, Object> styles) {
         this.graph.setStyles(styles);
     }

studio-api/src/main/java/com/baidu/hugegraph/studio/board/serializer/BoardSerializer.java

@@ -19,16 +19,6 @@
 
 package com.baidu.hugegraph.studio.board.serializer;
 
-import com.baidu.hugegraph.studio.board.model.Board;
-import com.baidu.hugegraph.studio.config.StudioApiConfig;
-import com.baidu.hugegraph.util.E;
-import com.baidu.hugegraph.util.Log;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.google.common.base.Charsets;
-import com.google.common.base.Preconditions;
-import org.slf4j.Logger;
-import org.springframework.stereotype.Repository;
-
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.File;
@@ -42,12 +32,23 @@
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
+import org.slf4j.Logger;
+import org.springframework.stereotype.Repository;
+
+import com.baidu.hugegraph.studio.board.model.Board;
+import com.baidu.hugegraph.studio.config.StudioApiConfig;
+import com.baidu.hugegraph.util.E;
+import com.baidu.hugegraph.util.Log;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.base.Charsets;
+import com.google.common.base.Preconditions;
+
 @Repository("boardSerializer")
 public class BoardSerializer {
 
     private static final Logger LOG = Log.logger(BoardSerializer.class);
 
-    private final ObjectMapper mapper = new ObjectMapper();
+    private static final ObjectMapper MAPPER = new ObjectMapper();
     private StudioApiConfig configuration;
     private String filePath;
 
@@ -111,7 +112,7 @@ public void save(Board board) {
         writeLock.lock();
         try (OutputStream os = new FileOutputStream(filePath);
              DataOutputStream out = new DataOutputStream(os)) {
-            byte[] all = mapper.writeValueAsString(board)
+            byte[] all = MAPPER.writeValueAsString(board)
                                .getBytes(Charsets.UTF_8);
             out.writeInt(all.length);
             out.write(all);
@@ -140,7 +141,7 @@ public Board load() {
             byte[] bytes = new byte[len];
             LOG.debug("Read total data: {} bytes", len);
             input.readFully(bytes);
-            return mapper.readValue(bytes, Board.class);
+            return MAPPER.readValue(bytes, Board.class);
         } catch (IOException e) {
             throw new RuntimeException(String.format(
                       "Failed to read File: '%s'", filePath), e);

studio-api/src/main/java/com/baidu/hugegraph/studio/board/service/BoardService.java

@@ -27,7 +27,6 @@
 import static com.baidu.hugegraph.studio.board.model.QueryResult.Type.SINGLE;
 import static com.baidu.hugegraph.studio.board.model.QueryResult.Type.VERTEX;
 
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
@@ -72,6 +71,9 @@
 import com.baidu.hugegraph.studio.config.StudioApiConfig;
 import com.baidu.hugegraph.studio.gremlin.GremlinOptimizer;
 import com.baidu.hugegraph.util.Log;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
@@ -89,10 +91,15 @@ public class BoardService {
     // Vis can deal with about 200 edges.
     private static final int MAX_EDGES_PER_VERTEX = 200;
     private static final StudioApiConfig conf = StudioApiConfig.getInstance();
-
+    private static final ObjectMapper MAPPER = new ObjectMapper();
     private static volatile HugeClient client = null;
 
     static {
+        SimpleModule simpleModule = new SimpleModule();
+        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
+        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
+        MAPPER.registerModule(simpleModule);
+
         // Add shutdown hook to close client
         Runtime.getRuntime().addShutdownHook(new Thread(() -> {
             try {
@@ -152,7 +159,9 @@ public Response executeGremlin(Card card) {
             board.setResult(queryResult);
             boardSerializer.save(board);
 
-            return Response.status(200).entity(queryResult).build();
+            return Response.status(200)
+                           .entity(MAPPER.writeValueAsString(queryResult))
+                           .build();
         } catch (Exception e) {
             QueryResult result = new QueryResult();
             result.setMessage(e.getMessage());
@@ -304,7 +313,9 @@ public Response adjacentVertices(
                                                                vertexId, label);
             boardSerializer.save(board);
 
-            return Response.status(200).entity(resultNew).build();
+            return Response.status(200)
+                           .entity(MAPPER.writeValueAsString(resultNew))
+                           .build();
         } catch (Exception e) {
             QueryResult result = new QueryResult();
             result.setMessage(e.getMessage());