解决修改数据库远程配置，canal-adapter 一直循环destroy、init。 (#2137)

client-adapter/launcher/src/main/java/com/alibaba/otter/canal/adapter/launcher/config/AdapterConfigHolder.java

@@ -0,0 +1,41 @@
+package com.alibaba.otter.canal.adapter.launcher.config;
+
+import com.alibaba.otter.canal.adapter.launcher.monitor.remote.ConfigItem;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * @author L.J.R @ 2019-09-03
+ * @version 1.1.4
+ */
+public class AdapterConfigHolder {
+
+    private volatile long adapterConfigTimestamp = 0;
+
+    private final Map<String, ConfigItem> adapterConfigs = new ConcurrentHashMap<>();
+
+    private static AdapterConfigHolder adapterConfigHolder;
+
+    private AdapterConfigHolder() {
+    }
+
+    public synchronized static AdapterConfigHolder getInstance() {
+        if (adapterConfigHolder == null) {
+            adapterConfigHolder = new AdapterConfigHolder();
+        }
+        return adapterConfigHolder;
+    }
+
+    public void setAdapterConfigTimestamp(long configTimestamp) {
+        this.adapterConfigTimestamp = configTimestamp;
+    }
+
+    public long getAdapterConfigTimestamp() {
+        return adapterConfigTimestamp;
+    }
+
+    public Map<String, ConfigItem> getAdapterConfigs() {
+        return this.adapterConfigs;
+    }
+}

client-adapter/launcher/src/main/java/com/alibaba/otter/canal/adapter/launcher/monitor/remote/DbRemoteConfigLoader.java

@@ -20,10 +20,10 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.otter.canal.adapter.launcher.config.AdapterConfigHolder;
 import com.alibaba.otter.canal.common.utils.CommonUtils;
 import com.alibaba.otter.canal.common.utils.NamedThreadFactory;
 import com.google.common.base.Joiner;
-import com.google.common.collect.MapMaker;
 
 /**
  * 基于数据库的远程配置装载器
@@ -33,17 +33,16 @@ import com.google.common.collect.MapMaker;
  */
 public class DbRemoteConfigLoader implements RemoteConfigLoader {
 
-    private static final Logger      logger                 = LoggerFactory.getLogger(DbRemoteConfigLoader.class);
+    private static final Logger      logger                    = LoggerFactory.getLogger(DbRemoteConfigLoader.class);
 
     private DruidDataSource          dataSource;
 
-    private volatile long            currentConfigTimestamp = 0;
+    private AdapterConfigHolder      remoteAdapterConfigHolder = AdapterConfigHolder.getInstance();
-    private Map<String, ConfigItem>  remoteAdapterConfigs   = new MapMaker().makeMap();
 
-    private ScheduledExecutorService executor               = Executors.newScheduledThreadPool(2,
+    private ScheduledExecutorService executor                  = Executors.newScheduledThreadPool(2,
         new NamedThreadFactory("remote-adapter-config-scan"));
 
-    private RemoteAdapterMonitor     remoteAdapterMonitor   = new RemoteAdapterMonitorImpl();
+    private RemoteAdapterMonitor     remoteAdapterMonitor      = new RemoteAdapterMonitorImpl();
 
     public DbRemoteConfigLoader(String driverName, String jdbcUrl, String jdbcUsername, String jdbcPassword){
         dataSource = new DruidDataSource();
@@ -76,8 +75,8 @@ public class DbRemoteConfigLoader implements RemoteConfigLoader {
             // 加载远程adapter配置
             ConfigItem configItem = getRemoteAdapterConfig();
             if (configItem != null) {
-                if (configItem.getModifiedTime() != currentConfigTimestamp) {
+                if (configItem.getModifiedTime() != remoteAdapterConfigHolder.getAdapterConfigTimestamp()) {
-                    currentConfigTimestamp = configItem.getModifiedTime();
+                    remoteAdapterConfigHolder.setAdapterConfigTimestamp(configItem.getModifiedTime());
                     overrideLocalCanalConfig(configItem.getContent());
                     logger.info("## Loaded remote adapter config: application.yml");
                 }
@@ -166,7 +165,7 @@ public class DbRemoteConfigLoader implements RemoteConfigLoader {
             List<Long> changedIds = new ArrayList<>();
 
             for (ConfigItem remoteConfigStat : remoteConfigStatus.values()) {
-                ConfigItem currentConfig = remoteAdapterConfigs
+                ConfigItem currentConfig = remoteAdapterConfigHolder.getAdapterConfigs()
                     .get(remoteConfigStat.getCategory() + "/" + remoteConfigStat.getName());
                 if (currentConfig == null) {
                     // 新增
@@ -192,8 +191,8 @@ public class DbRemoteConfigLoader implements RemoteConfigLoader {
                         configItemNew.setContent(rs.getString("content"));
                         configItemNew.setModifiedTime(rs.getTimestamp("modified_time").getTime());
 
-                        remoteAdapterConfigs.put(configItemNew.getCategory() + "/" + configItemNew.getName(),
+                        remoteAdapterConfigHolder.getAdapterConfigs()
-                            configItemNew);
+                            .put(configItemNew.getCategory() + "/" + configItemNew.getName(), configItemNew);
                         remoteAdapterMonitor.onModify(configItemNew);
                     }
 
@@ -203,10 +202,11 @@ public class DbRemoteConfigLoader implements RemoteConfigLoader {
             }
         }
 
-        for (ConfigItem configItem : remoteAdapterConfigs.values()) {
+        for (ConfigItem configItem : remoteAdapterConfigHolder.getAdapterConfigs().values()) {
             if (!remoteConfigStatus.containsKey(configItem.getCategory() + "/" + configItem.getName())) {
                 // 删除
-                remoteAdapterConfigs.remove(configItem.getCategory() + "/" + configItem.getName());
+                remoteAdapterConfigHolder.getAdapterConfigs()
+                    .remove(configItem.getCategory() + "/" + configItem.getName());
                 remoteAdapterMonitor.onDelete(configItem.getCategory() + "/" + configItem.getName());
             }
         }