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- /*
- * Copyright (C) 2010, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - 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.
- *
- * - Neither the name of the Eclipse Foundation, Inc. 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 COPYRIGHT OWNER 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.
- */
-
- package org.eclipse.jgit.events;
-
- import java.util.List;
- import java.util.concurrent.ConcurrentHashMap;
- import java.util.concurrent.ConcurrentMap;
- import java.util.concurrent.CopyOnWriteArrayList;
-
- /** Manages a thread-safe list of {@link RepositoryListener}s. */
- public class ListenerList {
- private final ConcurrentMap<Class<? extends RepositoryListener>, CopyOnWriteArrayList<ListenerHandle>> lists = new ConcurrentHashMap<Class<? extends RepositoryListener>, CopyOnWriteArrayList<ListenerHandle>>();
-
- /**
- * Register an IndexChangedListener.
- *
- * @param listener
- * the listener implementation.
- * @return handle to later remove the listener.
- */
- public ListenerHandle addIndexChangedListener(IndexChangedListener listener) {
- return addListener(IndexChangedListener.class, listener);
- }
-
- /**
- * Register a RefsChangedListener.
- *
- * @param listener
- * the listener implementation.
- * @return handle to later remove the listener.
- */
- public ListenerHandle addRefsChangedListener(RefsChangedListener listener) {
- return addListener(RefsChangedListener.class, listener);
- }
-
- /**
- * Register a ConfigChangedListener.
- *
- * @param listener
- * the listener implementation.
- * @return handle to later remove the listener.
- */
- public ListenerHandle addConfigChangedListener(
- ConfigChangedListener listener) {
- return addListener(ConfigChangedListener.class, listener);
- }
-
- /**
- * Add a listener to the list.
- *
- * @param <T>
- * the type of listener being registered.
- * @param type
- * type of listener being registered.
- * @param listener
- * the listener instance.
- * @return a handle to later remove the registration, if desired.
- */
- public <T extends RepositoryListener> ListenerHandle addListener(
- Class<T> type, T listener) {
- ListenerHandle handle = new ListenerHandle(this, type, listener);
- add(handle);
- return handle;
- }
-
- /**
- * Dispatch an event to all interested listeners.
- * <p>
- * Listeners are selected by the type of listener the event delivers to.
- *
- * @param event
- * the event to deliver.
- */
- @SuppressWarnings("unchecked")
- public void dispatch(RepositoryEvent event) {
- List<ListenerHandle> list = lists.get(event.getListenerType());
- if (list != null) {
- for (ListenerHandle handle : list)
- event.dispatch(handle.listener);
- }
- }
-
- private void add(ListenerHandle handle) {
- List<ListenerHandle> list = lists.get(handle.type);
- if (list == null) {
- CopyOnWriteArrayList<ListenerHandle> newList;
-
- newList = new CopyOnWriteArrayList<ListenerHandle>();
- list = lists.putIfAbsent(handle.type, newList);
- if (list == null)
- list = newList;
- }
- list.add(handle);
- }
-
- void remove(ListenerHandle handle) {
- List<ListenerHandle> list = lists.get(handle.type);
- if (list != null)
- list.remove(handle);
- }
- }
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