move eventbus implementation from scm-core to scm-webapp

scm-webapp/src/main/java/com/google/common/eventbus/ThrowingEventBus.java

@@ -0,0 +1,71 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of SCM-Manager; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+package com.google.common.eventbus;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import sonia.scm.event.EventBusException;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * {@link EventBus} which is able to throw {@link EventBusException}.
+ *
+ * @author Sebastian Sdorra
+ */
+public class ThrowingEventBus extends EventBus
+{
+
+  /**
+   * {@inheritDoc}
+   *
+   *
+   * @param event
+   * @param wrapper
+   */
+  @Override
+  void dispatch(Object event, EventHandler wrapper)
+  {
+    try
+    {
+      wrapper.handleEvent(event);
+    }
+    catch (InvocationTargetException ex)
+    {
+      throw new EventBusException(
+        "could not handle event ".concat(event.toString()), ex);
+    }
+  }
+}

scm-webapp/src/main/java/sonia/scm/ScmServletModule.java

@@ -252,7 +252,6 @@ public class ScmServletModule extends ServletModule
 
     // bind event api
     bind(ScmEventBus.class).toInstance(ScmEventBus.getInstance());
-    bind(EventBus.class).toInstance(ScmEventBus.getInstance());
 
     // bind core
     bind(StoreFactory.class, JAXBStoreFactory.class);

scm-webapp/src/main/java/sonia/scm/event/GuavaScmEventBus.java

@@ -0,0 +1,154 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+package sonia.scm.event;
+
+import com.google.common.eventbus.AsyncEventBus;
+import com.google.common.eventbus.EventBus;
+import com.google.common.eventbus.ThrowingEventBus;
+import java.util.concurrent.Executors;
+import org.apache.shiro.concurrent.SubjectAwareExecutorService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class GuavaScmEventBus extends ScmEventBus
+{
+  
+  /**
+   * the logger for GuavaScmEventBus
+   */
+  private static final Logger logger = LoggerFactory.getLogger(
+    GuavaScmEventBus.class);
+  
+  
+  /**
+   *  Constructs a new ScmEventBus
+   *
+   */
+  public GuavaScmEventBus()
+  {
+    eventBus = new ThrowingEventBus();
+    asyncEventBus = new AsyncEventBus(
+      new SubjectAwareExecutorService(Executors.newCachedThreadPool()));
+  }
+
+  
+  /**
+   * {@inheritDoc}
+   *
+   *
+   * @param event
+   */
+  @Override
+  public void post(Object event)
+  {
+    logger.debug("post {} to event bus", event);
+    asyncEventBus.post(event);
+    eventBus.post(event);
+  }
+
+  /**
+   * {@inheritDoc}
+   *
+   *
+   * @param object
+   */
+  @Override
+  public void register(Object object)
+  {
+    register(object, true);
+  }
+
+  /**
+   * Registers a object to the eventbus.
+   *
+   * @param object object to register
+   * @param async handle event asynchronously
+   *
+   * @see {@link #register(java.lang.Object)}
+   */
+  @Override
+  public void register(Object object, boolean async)
+  {
+    logger.debug("register {} to event bus, async = {}", object, async);
+
+    if (async)
+    {
+      asyncEventBus.register(object);
+    }
+    else
+    {
+      eventBus.register(object);
+    }
+  }
+
+  /**
+   * {@inheritDoc}
+   *
+   *
+   * @param object
+   */
+  @Override
+  public void unregister(Object object)
+  {
+    logger.debug("unregister {} from event bus", object);
+    unregister(asyncEventBus, object);
+    unregister(eventBus, object);
+  }
+
+  /**
+   * Unregisters the object from eventbus.
+   *
+   *
+   * @param bus event bus
+   * @param object object to unregister
+   */
+  private void unregister(EventBus bus, Object object)
+  {
+    try
+    {
+      bus.unregister(object);
+    }
+    catch (IllegalArgumentException ex)
+    {
+      logger.trace("object {} was not registered at {}", object, bus);
+    }
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** asynchronous event bus */
+  private AsyncEventBus asyncEventBus;
+
+  /** synchronous event bus */
+  private EventBus eventBus;
+}