44.2. 实施消息接口

import org.apache.camel.Exchange;
import org.apache.camel.impl.DefaultMessage;

public class CustomMessage extends DefaultMessage { 1

    public CustomMessage() { 2
        // Create message with default properties...
    }

    @Override
    public String toString() { 3
        // Return a stringified message...
    }

    @Override
    public CustomMessage newInstance() { 4
        return new CustomMessage( ... );
    }

    @Override
    protected Object createBody() { 5
        // Return message body (lazy creation).
    }

    @Override
    protected void populateInitialHeaders(Map<String, Object> map) { 6
        // Initialize headers from underlying message (lazy creation).
    }

    @Override
    protected void populateInitialAttachments(Map<String, DataHandler> map) { 7
        // Initialize attachments from underlying message (lazy creation).
    }
}