use same object as key and value

Author: 317787106

framework/src/main/java/org/tron/core/services/jsonrpc/TronJsonRpcImpl.java

@@ -112,10 +112,11 @@ public enum RequestSource {
 
   private static final String FILTER_NOT_FOUND = "filter not found";
   public static final int EXPIRE_SECONDS = 5 * 60;
-  private static final Cache<Integer, LogFilterElement> logElementCache = CacheBuilder.newBuilder()
-      .maximumSize(300_000L) // 300s * tps(1000) * 1 log/tx ≈ 300_000
-      .expireAfterWrite(EXPIRE_SECONDS, TimeUnit.SECONDS)
-      .recordStats().build(); //LRU cache
+  private static final Cache<LogFilterElement, LogFilterElement> logElementCache =
+      CacheBuilder.newBuilder()
+          .maximumSize(300_000L) // 300s * tps(1000) * 1 log/tx ≈ 300_000
+          .expireAfterWrite(EXPIRE_SECONDS, TimeUnit.SECONDS)
+          .recordStats().build(); //LRU cache
   /**
    * for log filter in Full Json-RPC
    */
@@ -171,7 +172,7 @@ public enum RequestSource {
 
   @Autowired
   public TronJsonRpcImpl(@Autowired NodeInfoService nodeInfoService, @Autowired Wallet wallet,
-      @Autowired Manager manager) {
+                         @Autowired Manager manager) {
     this.nodeInfoService = nodeInfoService;
     this.wallet = wallet;
     this.manager = manager;
@@ -239,8 +240,10 @@ public static void handleLogsFilter(LogsFilterCapsule logsFilterCapsule) {
       for (LogFilterElement element : elements) {
         LogFilterElement newElement;
         try {
-          newElement = logElementCache.get(element.hashCode(), () -> element);
+          //compare with hashcode() first, then with equals(). If not exist, put it.
+          newElement = logElementCache.get(element, () -> element);
         } catch (ExecutionException e) {
+          logger.error("Getting/loading LogFilterElement from cache fails", e);//never happen
           continue;
         }
         logFilterAndResult.getResult().add(newElement);