<commit_before>/*
 * Copyright (c) 2010. Axon Framework
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.axonframework.core.command;

import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * Implementation of the CommandBus that dispatches commands to the handlers subscribed to that specific type of
 * command. Interceptors may be configured to add processing to commands regardless of their type, for example logging,
 * security (authorization), sla monitoring, etc.
 *
 * @author <NAME>
 * @since 0.5
 */
public class SimpleCommandBus implements CommandBus {

    private ConcurrentMap<Class<?>, CommandHandler<?>> subscriptions = new ConcurrentHashMap<Class<?>, CommandHandler<?>>();
    private volatile InterceptorChain interceptorChain = new InterceptorChain(Collections.<CommandHandlerInterceptor>emptyList());

    @SuppressWarnings({"unchecked"})
    @Override<commit_msg>Working on issue #23: Add concept of command handler - added a final keyword to improve thread safety<commit_after>/*
 * Copyright (c) 2010. Axon Framework
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.axonframework.core.command;

import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * Implementation of the CommandBus that dispatches commands to the handlers subscribed to that specific type of
 * command. Interceptors may be configured to add processing to commands regardless of their type, for example logging,
 * security (authorization), sla monitoring, etc.
 *
 * @author <NAME>
 * @since 0.5
 */
public class SimpleCommandBus implements CommandBus {

    private final ConcurrentMap<Class<?>, CommandHandler<?>> subscriptions = new ConcurrentHashMap<Class<?>, CommandHandler<?>>();
    private volatile InterceptorChain interceptorChain = new InterceptorChain(Collections.<CommandHandlerInterceptor>emptyList());

    @SuppressWarnings({"unchecked"})
    @Override
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