moved ThriftManager and ThriftHandler to master-sync-shared

1 files changed, 101 insertions, 0 deletions

diff --git a/src/main/java/org/openslx/thrifthelper/ThriftHandler.java b/src/main/java/org/openslx/thrifthelper/ThriftHandler.java
new file mode 100644
index 0000000..ed66678
--- /dev/null
+++ b/src/main/java/org/openslx/thrifthelper/ThriftHandler.java
@@ -0,0 +1,101 @@
+package org.openslx.thrifthelper;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.log4j.Logger;
+import org.apache.thrift.TException;
+import org.apache.thrift.transport.TTransportException;
+
+public class ThriftHandler<T extends Object> implements InvocationHandler {
+
+	private final static Logger LOGGER = Logger.getLogger(ThriftHandler.class);
+	
+	public interface ClientCreationCallback<T> {
+		public T get();
+	}
+
+	private final ThreadLocal<T> clients = new ThreadLocal<T>();
+	private final ClientCreationCallback<T> callback;
+
+	public ThriftHandler(final Class<T> clazz, ClientCreationCallback<T> cb) {
+		callback = cb;
+		thriftMethods = Collections.unmodifiableSet(new HashSet<String>() {
+			private static final long serialVersionUID = 8983506538154055231L;
+			{
+				Method[] methods = clazz.getMethods();
+				for (int i = 0; i < methods.length; i++) {
+					boolean thrift = false;
+					Class<?>[] type = methods[i].getExceptionTypes();
+					for (int e = 0; e < type.length; e++) {
+						if (TException.class.isAssignableFrom(type[e]))
+							thrift = true;
+
+					}
+					String name = methods[i].getName();
+					if (thrift && !name.startsWith("send_") && !name.startsWith("recv_")) {
+						add(name);
+					}
+				}
+			}
+		});
+	}
+
+	private final Set<String> thriftMethods;
+
+	public Object invoke(Object tproxy, Method method, Object[] args) throws Throwable {
+
+		// first find the thrift methods
+		if (!thriftMethods.contains(method.getName())) {
+			try {
+				return method.invoke(method, args);
+			} catch (InvocationTargetException e) {
+				// TODO Auto-generated catch block
+				Throwable cause = e.getCause();
+				if (cause == null) {
+					throw new RuntimeException();
+				}
+				throw cause;
+			}
+		}
+		LOGGER.debug("Proxying '" + method.getName() + "'");
+
+		T client = getClient(false);
+		Throwable cause = null;
+		for (int i = 0; i < 3; i++) {
+			try {
+				return method.invoke(client, args);
+			} catch (InvocationTargetException e) {
+				cause = e.getCause();
+				if (cause instanceof TTransportException) {
+					LOGGER.debug("Transport error - re-initialising ...");
+					// new client
+					client = getClient(true);
+				}
+			}
+		}
+
+		if (cause != null)
+			throw cause;
+		return null;
+
+	}
+
+	private T getClient(boolean forceNew) {
+		T client = clients.get();
+		if (client != null && !forceNew) {
+			return client;
+		}
+		client = callback.get();
+		if (client == null) {
+			// TODO own exception
+			throw new RuntimeException();
+		}
+		clients.set(client);
+		return client;
+	}
+}