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move eventbus implementation from scm-core to scm-webapp

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This commit is contained in:
Sebastian Sdorra
2012-12-09 16:12:21 +01:00
parent 261b70071d
commit 5178dca30d
7 changed files with 206 additions and 100 deletions
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72
scm-core/src/main/java/com/google/common/eventbus/ThrowingEventBus.java
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@@ -1,72 +0,0 @@
/**
* 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
* @since 1.23
*/
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);
}
}
}

3
scm-core/src/main/java/sonia/scm/event/EventBusException.java
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@@ -32,10 +32,9 @@
package sonia.scm.event;
import com.google.common.eventbus.ThrowingEventBus;
/**
* Exception is thrown if from the {@link ThrowingEventBus} an error occurs
* Exception is thrown from the {@link ScmEventBus} if an error occurs
* during a synchronous event post operation.
*
* @author Sebastian Sdorra

143
scm-core/src/main/java/sonia/scm/event/ScmEventBus.java
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@@ -30,58 +30,45 @@
*/
package sonia.scm.event;
//~--- non-JDK imports --------------------------------------------------------
import com.google.common.eventbus.AsyncEventBus;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.ThrowingEventBus;
import org.apache.shiro.concurrent.SubjectAwareExecutorService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sonia.scm.util.ServiceUtil;
//~--- JDK imports ------------------------------------------------------------
import java.util.concurrent.Executors;
import java.util.ServiceLoader;
/**
* Dispatches events to listeners, and provides ways for listeners to register
* themselves.
* themselves. The ScmEventBus searches its implementation with the
* {@link ServiceLoader}.
*
* @see {@link EventBus}
* @author Sebastian Sdorra
* @since 1.23
*
*
* @apiviz.landmark
*/
public class ScmEventBus extends EventBus
public abstract class ScmEventBus
{
/** Field description */
private volatile static ScmEventBus instance;
/**
* the logger for ScmEventBus
*/
private static final Logger logger =
LoggerFactory.getLogger(ScmEventBus.class);
/** Field description */
private static ScmEventBus instance = new ScmEventBus();
//~--- constructors ---------------------------------------------------------
/**
* Constructs a new ScmEventBus
*
*/
private ScmEventBus()
{
eventBus = new ThrowingEventBus();
asyncEventBus = new AsyncEventBus(
new SubjectAwareExecutorService(Executors.newCachedThreadPool()));
}
//~--- get methods ----------------------------------------------------------
/**
@@ -92,97 +79,65 @@ public class ScmEventBus extends EventBus
*/
public static ScmEventBus getInstance()
{
if (instance == null)
{
synchronized (ScmEventBus.class)
{
if (instance == null)
{
instance = ServiceUtil.getService(ScmEventBus.class);
if (instance == null)
{
throw new IllegalStateException(
"could not find a event bus implementation");
}
else
{
logger.info("use {} as event bus implementation",
instance.getClass().getName());
}
}
}
}
return instance;
}
//~--- methods --------------------------------------------------------------
/**
* {@inheritDoc}
* Post a event through the event bus. All registered subscribers will be
* notified by the event bus.
*
*
* @param event
* @param event event to send through the event bus
*/
@Override
public void post(Object event)
{
logger.debug("post {} to event bus", event);
asyncEventBus.post(event);
eventBus.post(event);
}
public abstract void post(Object event);
/**
* {@inheritDoc}
* Register all handler methods with the {@link Subscribe} annotation as
* subscriber for the event bus.
*
*
* @param object
* @param subscriber subscriber object
* @param async should the subscriber receive the event in async manner
*/
@Override
public void register(Object object)
{
register(object, true);
}
public abstract void register(Object subscriber, boolean async);
/**
* Registers a object to the eventbus.
* Unregister the given subscriber object from the event bus.
*
* @param object object to register
* @param async handle event asynchronously
*
* @see {@link #register(java.lang.Object)}
* @param subscriber subscriber object to unregister
*/
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);
}
}
public abstract void unregister(Object subscriber);
/**
* {@inheritDoc}
* This method is the same as {@code register(subscriber, true)}.
*
*
* @param object
* @param subscriber subscriber object
*/
@Override
public void unregister(Object object)
public void register(Object subscriber)
{
logger.debug("unregister {} from event bus", object);
unregister(asyncEventBus, object);
unregister(eventBus, object);
register(subscriber, true);
}
/**
* 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;
}

3
scm-core/src/main/java/sonia/scm/event/Subscriber.java
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@@ -34,7 +34,6 @@ package sonia.scm.event;
//~--- JDK imports ------------------------------------------------------------
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
@@ -47,7 +46,7 @@ import sonia.scm.EagerSingleton;
* The subscriber annotation could be use to register listener classes to the
* {@link ScmEventBus}. A registered listener object can use the
* {@link Subscribe} annotation for methods to receive events,
* for more informations have a look at {@link EventBus}. The annotated object
* for more informations have a look at {@link ScmEventBus}. The annotated object
* is only bind to the {@link ScmEventBus}, if the the object is loaded from the
* injection system of SCM-Manager. If your object is not loaded by the
* injection system you have to register your object by yourself with the