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

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machey
2018-11-11 19:44:30 +08:00
parent 4a27d81da1
commit e7086415f8
5 changed files with 63 additions and 16 deletions
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53
client-adapter/common/src/main/java/com/alibaba/otter/canal/client/adapter/support/ExtensionLoader.java
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@@ -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) {