rdb专用的的ClassExtensionLoader，默认canal client logger example配置

client-adapter/common/src/main/java/com/alibaba/otter/canal/client/adapter/support/ExtensionLoader.java

@@ -40,6 +40,8 @@ public class ExtensionLoader<T> {
 
     private static final ConcurrentMap<Class<?>, Object>             EXTENSION_INSTANCES        = new ConcurrentHashMap<>();
 
+    private static final ConcurrentMap<String, Object>               EXTENSION_KEY_INSTANCES    = new ConcurrentHashMap<>();
+
     private final Class<?>                                           type;
 
     private final String                                             classLoaderPolicy;
@@ -116,6 +118,30 @@ public class ExtensionLoader<T> {
         return (T) instance;
     }
 
+    @SuppressWarnings("unchecked")
+    public T getExtension(String name, String key) {
+        if (name == null || name.length() == 0) throw new IllegalArgumentException("Extension name == null");
+        if ("true".equals(name)) {
+            return getDefaultExtension();
+        }
+        Holder<Object> holder = cachedInstances.get(name + "-" + key);
+        if (holder == null) {
+            cachedInstances.putIfAbsent(name + "-" + key, new Holder<>());
+            holder = cachedInstances.get(name + "-" + key);
+        }
+        Object instance = holder.get();
+        if (instance == null) {
+            synchronized (holder) {
+                instance = holder.get();
+                if (instance == null) {
+                    instance = createExtension(name, key);
+                    holder.set(instance);
+                }
+            }
+        }
+        return (T) instance;
+    }
+
     /**
      * 返回缺省的扩展，如果没有设置则返回<code>null</code>
      */
@@ -149,14 +175,19 @@ public class ExtensionLoader<T> {
     }
 
     @SuppressWarnings("unchecked")
-    public T newInstance(String name) {
+    private T createExtension(String name, String key) {
         Class<?> clazz = getExtensionClasses().get(name);
         if (clazz == null) {
             throw new IllegalStateException("Extension instance(name: " + name + ", class: " + type
                                             + ")  could not be instantiated: class could not be found");
         }
         try {
-            return (T) clazz.newInstance();
+            T instance = (T) EXTENSION_KEY_INSTANCES.get(name + "-" + key);
+            if (instance == null) {
+                EXTENSION_KEY_INSTANCES.putIfAbsent(name + "-" + key, clazz.newInstance());
+                instance = (T) EXTENSION_KEY_INSTANCES.get(name + "-" + key);
+            }
+            return instance;
         } catch (Throwable t) {
             throw new IllegalStateException("Extension instance(name: " + name + ", class: " + type
                                             + ")  could not be instantiated: " + t.getMessage(),
@@ -164,6 +195,24 @@ public class ExtensionLoader<T> {
         }
     }
 
+    @SuppressWarnings("unchecked")
+    // public T newInstance(String name) {
+    // Class<?> clazz = getExtensionClasses().get(name);
+    // if (clazz == null) {
+    // throw new IllegalStateException("Extension instance(name: " + name + ",
+    // class: " + type
+    // + ") could not be instantiated: class could not be found");
+    // }
+    // try {
+    // return (T) clazz.newInstance();
+    // } catch (Throwable t) {
+    // throw new IllegalStateException("Extension instance(name: " + name + ",
+    // class: " + type
+    // + ") could not be instantiated: " + t.getMessage(),
+    // t);
+    // }
+    // }
+
     private Map<String, Class<?>> getExtensionClasses() {
         Map<String, Class<?>> classes = cachedClasses.get();
         if (classes == null) {

client-adapter/launcher/src/main/assembly/dev.xml

@@ -23,7 +23,7 @@
 		</fileSet>
 		<fileSet>
 			<directory>./src/main/resources</directory>
-			<outputDirectory>/config</outputDirectory>
+			<outputDirectory>/conf</outputDirectory>
 			<includes>
 				<include>**/*</include>
 
@@ -31,21 +31,21 @@
 		</fileSet>
 		<fileSet>
 			<directory>../elasticsearch/src/main/resources/es</directory>
-			<outputDirectory>/config/es</outputDirectory>
+			<outputDirectory>/conf/es</outputDirectory>
 			<includes>
 				<include>**/*</include>
 			</includes>
 		</fileSet>
         <fileSet>
             <directory>../hbase/src/main/resources/hbase</directory>
-            <outputDirectory>/config/hbase</outputDirectory>
+            <outputDirectory>/conf/hbase</outputDirectory>
             <includes>
                 <include>**/*</include>
             </includes>
         </fileSet>
 		<fileSet>
 			<directory>../rdb/src/main/resources/</directory>
-			<outputDirectory>/config</outputDirectory>
+			<outputDirectory>/conf</outputDirectory>
             <excludes>
                 <exclude>META-INF/**</exclude>
             </excludes>

client-adapter/launcher/src/main/bin/startup.sh

@@ -10,8 +10,6 @@ case "`uname`" in
 		;;
 esac
 base=${bin_abs_path}/..
-#canal_conf=$base/config/canal.properties
-#logback_configurationFile=$base/conf/logback.xml
 export LANG=en_US.UTF-8
 export BASE=$base
 

client-adapter/launcher/src/main/java/com/alibaba/otter/canal/adapter/launcher/loader/CanalAdapterLoader.java

@@ -125,7 +125,7 @@ public class CanalAdapterLoader {
         try {
             OuterAdapter adapter;
             if ("rdb".equalsIgnoreCase(config.getName())) {
-                adapter = loader.newInstance(config.getName());
+                adapter = loader.getExtension(config.getName(), config.getKey());
             } else {
                 adapter = loader.getExtension(config.getName());
             }

client-adapter/launcher/src/main/resources/application.yml

@@ -11,16 +11,16 @@ spring:
     time-zone: GMT+8
     default-property-inclusion: non_null
 
-#canal.conf:
+canal.conf:
-#  canalServerHost: 127.0.0.1:11111
+  canalServerHost: 127.0.0.1:11111
 #  zookeeperHosts: slave1:2181
 #  bootstrapServers: slave1:6667 #or rocketmq
 #  flatMessage: true
-#  canalInstances:
+  canalInstances:
-#  - instance: example
+  - instance: example
-#    groups:
+    groups:
-#    - outAdapters:
+    - outAdapters:
-#      - name: logger
+      - name: logger
 #      - name: rdb
 #        key: oracle1
 #        properties: