com.jgoetsch.eventtrader.source.HttpStreamingMsgSource.java Source code

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Here is the source code for com.jgoetsch.eventtrader.source.HttpStreamingMsgSource.java

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/*
 * Copyright (c) 2012 Jeremy Goetsch
 *
 * 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.jgoetsch.eventtrader.source;

import java.net.SocketTimeoutException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpUriRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.jgoetsch.eventtrader.source.parser.MsgParser;

public class HttpStreamingMsgSource extends AbstractHttpMsgSource {

    private Logger log = LoggerFactory.getLogger(HttpStreamingMsgSource.class);
    private MsgParser msgParser;

    public void receiveMsgs(HttpClient client) {
        log.info("receiveMsgss");
        while (executeRequest(client, createRequest(), getMsgParser()) && afterDisconnect()) {
        }
    }

    protected boolean executeRequest(HttpClient client, HttpUriRequest request, MsgParser msgParser) {
        HttpEntity entity = null;
        try {
            HttpResponse rsp = client.execute(request);
            entity = rsp.getEntity();
            if (rsp.getStatusLine().getStatusCode() >= 400 || entity == null) {
                log.warn("HTTP request to " + request.getURI() + " failed with status " + rsp.getStatusLine());

                // if 400 level error don't keep trying
                return (rsp.getStatusLine().getStatusCode() >= 500);
            } else {
                log.info("Connected to streaming source " + request.getURI().getHost() + ", waiting for messages");
                return msgParser.parseContent(entity.getContent(), -1, entity.getContentType().getValue(), this);
            }
        } catch (SocketTimeoutException e) {
            return true;
        } catch (Exception e) {
            log.warn("Exception reading or parsing message source", e);
            return false;
        } finally {
            request.abort();
        }
    }

    protected boolean afterDisconnect() {
        log.info("Disconnected from streaming source, waiting to reconnect...");
        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
        }
        return true;
    }

    public void setMsgParser(MsgParser msgParser) {
        this.msgParser = msgParser;
    }

    public MsgParser getMsgParser() {
        return msgParser;
    }

}