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Camel Direct component
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/*
 * 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.camel.component.direct;

import org.apache.camel.Processor;
import org.apache.camel.ShutdownRunningTask;
import org.apache.camel.Suspendable;
import org.apache.camel.spi.ShutdownAware;
import org.apache.camel.support.DefaultConsumer;

/**
 * The direct consumer.
 */
public class DirectConsumer extends DefaultConsumer implements ShutdownAware, Suspendable {

    private final DirectComponent component;
    private final String key;

    public DirectConsumer(DirectEndpoint endpoint, Processor processor, String key) {
        super(endpoint, processor);
        this.component = (DirectComponent) endpoint.getComponent();
        this.key = key;
    }

    @Override
    public DirectEndpoint getEndpoint() {
        return (DirectEndpoint) super.getEndpoint();
    }

    @Override
    protected void doStart() throws Exception {
        super.doStart();
        component.addConsumer(key, this);
    }

    @Override
    protected void doStop() throws Exception {
        component.removeConsumer(key, this);
        super.doStop();
    }

    @Override
    protected void doSuspend() throws Exception {
        component.removeConsumer(key, this);
    }

    @Override
    protected void doResume() throws Exception {
        // resume by using the start logic
        component.addConsumer(key, this);
    }

    @Override
    public boolean deferShutdown(ShutdownRunningTask shutdownRunningTask) {
        // deny stopping on shutdown as we want direct consumers to run in case some other queues
        // depend on this consumer to run, so it can complete its exchanges
        return true;
    }

    @Override
    public int getPendingExchangesSize() {
        // return 0 as we do not have an internal memory queue with a variable size
        // of inflight messages.
        return 0;
    }

    @Override
    public void prepareShutdown(boolean suspendOnly, boolean forced) {
        // noop
    }
}