uk.co.shastra.hydra.messaging.messagefetchers.MultiFetcher Maven / Gradle / Ivy

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Hydra is a simple, highly redundant pull-based messaging system. It uses CouchDb as its message store, and replication to deliver messages. It can be used by any language capable of making HTTP calls, and C# and Java client implementations are included.

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package uk.co.shastra.hydra.messaging.messagefetchers;

import java.util.ArrayList;

import uk.co.shastra.hydra.messaging.TransportMessage;
import uk.co.shastra.hydra.messaging.messageids.MessageId;
import uk.co.shastra.hydra.messaging.storage.Store;
import uk.co.shastra.hydra.messaging.utils.ListUtils;

public class MultiFetcher implements MessageFetcher {

    private MessageFetcher[] fetchers;

	public MultiFetcher(MessageFetcher... fetchers)
    {
        this.fetchers = fetchers;
    }
    
	@Override
	public Iterable messagesAfterIdUpToSeq(Store store, MessageId startId, long lastSeq) {
		ArrayList> messageLists = new ArrayList>();
		for (MessageFetcher fetcher : fetchers) {
			messageLists.add(fetcher.messagesAfterIdUpToSeq(store, startId, lastSeq));
		}
		return ListUtils.Merge(messageLists);
	}

	@Override
	public Iterable messagesInSet(Store store, Iterable messageIds) {
		ArrayList> messageLists = new ArrayList>();
		for (MessageFetcher fetcher : fetchers) {
			messageLists.add(fetcher.messagesInSet(store, messageIds));
		}
		return ListUtils.Merge(messageLists);
	}

}