com.meltmedia.cadmium.core.commands.HistoryRequestCommandAction.java Source code

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Here is the source code for com.meltmedia.cadmium.core.commands.HistoryRequestCommandAction.java

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/**
 *    Copyright 2012 meltmedia
 *
 *    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 com.meltmedia.cadmium.core.commands;

import java.util.List;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.meltmedia.cadmium.core.CommandAction;
import com.meltmedia.cadmium.core.CommandContext;
import com.meltmedia.cadmium.core.history.HistoryEntry;
import com.meltmedia.cadmium.core.history.HistoryManager;
import com.meltmedia.cadmium.core.messaging.ChannelMember;
import com.meltmedia.cadmium.core.messaging.Message;
import com.meltmedia.cadmium.core.messaging.MessageSender;
import com.meltmedia.cadmium.core.messaging.ProtocolMessage;

@Singleton
public class HistoryRequestCommandAction implements CommandAction<HistoryRequest> {
    private final Logger log = LoggerFactory.getLogger(getClass());

    @Inject
    protected HistoryManager historyManager;

    @Inject
    protected MessageSender sender;

    public String getName() {
        return ProtocolMessage.HISTORY_REQUEST;
    };

    @Override
    public boolean execute(CommandContext<HistoryRequest> ctx) throws Exception {
        HistoryRequest request = ctx.getMessage().getBody();
        if (request.getLimit() == null)
            request.setLimit(-1);
        List<HistoryEntry> history = historyManager.getHistory(request.getLimit(), request.getFilter());
        log.info("Received history-request message responding with {} history items", history.size());

        HistoryResponse responseBody = new HistoryResponse(history);
        Message<HistoryResponse> response = new Message<HistoryResponse>(ProtocolMessage.HISTORY_RESPONSE,
                responseBody);
        sender.sendMessage(response, new ChannelMember(ctx.getSource()));
        return true;
    }

    @Override
    public void handleFailure(CommandContext<HistoryRequest> ctx, Exception e) {
        log.error("Command Failed " + ToStringBuilder.reflectionToString(ctx), e);
    }

}