modules/core/src/main/java/org/apache/ignite/internal/management/api/CommandRegistryImpl.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.ignite.internal.management.api;

import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.apache.ignite.internal.dto.IgniteDataTransferObject;
import org.apache.ignite.internal.management.IgniteCommandRegistry;

import static org.apache.ignite.internal.management.api.CommandUtils.cmdKey;

/**
 * All commands class names stored in registry must ends with {@link Command#CMD_NAME_POSTFIX}.
 *
 * @see org.apache.ignite.internal.management.kill.KillCommand
 * @see org.apache.ignite.internal.management.kill.KillComputeCommand
 */
public abstract class CommandRegistryImpl<A extends IgniteDataTransferObject, R> implements CommandsRegistry<A, R> {
    /** Subcommands. */
    private final Map<String, Command<?, ?>> commands = new LinkedHashMap<>();

    /** */
    protected CommandRegistryImpl(Command<?, ?>... subcommands) {
        for (Command<?, ?> cmd : subcommands)
            register(cmd);
    }

    /**
     * Register new command.
     * @param cmd Command to register.
     */
    protected void register(Command<?, ?> cmd) {
        boolean hasParent = CommandsRegistry.class.isAssignableFrom(getClass())
            && getClass() != IgniteCommandRegistry.class;

        String key = cmdKey(
            cmd.getClass(),
            hasParent ? (Class<? extends CommandsRegistry<?, ?>>)getClass() : null
        );

        if (commands.containsKey(key))
            throw new IllegalArgumentException("Command already registered");

        commands.put(key, cmd);
    }

    /** {@inheritDoc} */
    @Override public Command<?, ?> command(String name) {
        return commands.get(name);
    }

    /** {@inheritDoc} */
    @Override public Iterator<Map.Entry<String, Command<?, ?>>> commands() {
        return commands.entrySet().iterator();
    }
}