持久化保存时避免集合复制，节约内存

Author: Ghost-chu

src/main/java/com/ghostchu/peerbanhelper/database/dao/impl/PeerRecordDao.java

@@ -12,7 +12,7 @@
 
 import java.sql.SQLException;
 import java.sql.Timestamp;
-import java.util.List;
+import java.util.Deque;
 
 @Component
 @Slf4j
@@ -25,15 +25,16 @@ public PeerRecordDao(@Autowired Database database, TorrentDao torrentDao) throws
         setObjectCache(true);
     }
 
-    public void syncPendingTasks(List<BatchHandleTasks> tasks) throws SQLException {
+    public void syncPendingTasks(Deque<BatchHandleTasks> tasks) throws SQLException {
         callBatchTasks(() -> {
-            tasks.forEach(t -> {
+            while (!tasks.isEmpty()) {
+                var t = tasks.pop();
                 try {
                     writeToDatabase(t.timestamp, t.downloader, t.torrent, t.peer);
                 } catch (SQLException e) {
                     log.error("Unable save peer record to database, please report to developer: {}, {}, {}, {}", t.timestamp, t.downloader, t.torrent, t.peer);
                 }
-            });
+            }
             return null;
         });
     }

src/main/java/com/ghostchu/peerbanhelper/database/dao/impl/ProgressCheatBlockerPersistDao.java

@@ -13,6 +13,7 @@
 import java.sql.SQLException;
 import java.sql.Timestamp;
 import java.util.Collections;
+import java.util.Deque;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.stream.Collectors;
@@ -26,7 +27,7 @@ public ProgressCheatBlockerPersistDao(@Autowired Database database) throws SQLEx
 
     public List<ProgressCheatBlocker.ClientTask> fetchFromDatabase(ProgressCheatBlocker.Client client, Timestamp after) throws SQLException {
         IPAddress address = IPAddressUtil.getIPAddress(client.getPeerPrefix());
-        if(address == null) return Collections.emptyList();
+        if (address == null) return Collections.emptyList();
         List<ProgressCheatBlockerPersistEntity> entities = queryBuilder()
                 .where()
                 .eq("torrentId", client.getTorrentId())
@@ -52,9 +53,10 @@ public List<ProgressCheatBlocker.ClientTask> fetchFromDatabase(ProgressCheatBloc
         ).collect(Collectors.toCollection(CopyOnWriteArrayList::new)); // 可变 List，需要并发安全
     }
 
-    public void flushDatabase(List<ProgressCheatBlocker.ClientTaskRecord> records) throws SQLException {
+    public void flushDatabase(Deque<ProgressCheatBlocker.ClientTaskRecord> records) throws SQLException {
         callBatchTasks(() -> {
-            records.forEach(record -> {
+            while (!records.isEmpty()) {
+                var record = records.pop();
                 String torrentId = record.client().getTorrentId();
                 record.task().forEach(task -> {
                     try {
@@ -88,7 +90,7 @@ public void flushDatabase(List<ProgressCheatBlocker.ClientTaskRecord> records) t
                         log.error("Unable write PCB persist data into database", e);
                     }
                 });
-            });
+            }
             return null;
         });
     }

src/main/java/com/ghostchu/peerbanhelper/module/impl/rule/ActiveMonitoringModule.java

@@ -20,10 +20,8 @@
 import org.springframework.stereotype.Component;
 
 import java.sql.SQLException;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Deque;
-import java.util.List;
 import java.util.concurrent.*;
 
 import static com.ghostchu.peerbanhelper.text.TextManager.tlUI;
@@ -141,12 +139,8 @@ private void writeJournal() {
 
     private void flush() {
         try {
-            List<PeerRecordDao.BatchHandleTasks> tasks = new ArrayList<>();
-            while (!dataBuffer.isEmpty()) {
-                tasks.add(dataBuffer.poll());
-            }
             try {
-                peerRecordDao.syncPendingTasks(tasks);
+                peerRecordDao.syncPendingTasks(dataBuffer);
             } catch (SQLException e) {
                 log.warn("Unable sync peers data to database", e);
                 rollbarErrorReporter.warning(e);

src/main/java/com/ghostchu/peerbanhelper/module/impl/rule/ProgressCheatBlocker.java

@@ -114,12 +114,8 @@ private void cleanDatabase() {
 
     private void flushDatabase() {
         try {
-            List<ClientTaskRecord> records = new ArrayList<>();
-            while (!pendingPersistQueue.isEmpty()) {
-                records.add(pendingPersistQueue.poll());
-            }
             try {
-                progressCheatBlockerPersistDao.flushDatabase(records);
+                progressCheatBlockerPersistDao.flushDatabase(pendingPersistQueue);
             } catch (SQLException e) {
                 log.error("Unable flush records into database", e);
                 rollbarErrorReporter.error(e);