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// $Id$
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/**
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* Copyright (C) 2015 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package org.cybertaxonomy.utis.store;
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import java.io.IOException;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.util.Arrays;
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import java.util.Date;
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import org.apache.commons.httpclient.util.DateParseException;
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import org.apache.commons.httpclient.util.DateUtil;
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import org.apache.http.Header;
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import org.apache.http.HttpResponse;
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import org.apache.http.client.ClientProtocolException;
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import org.apache.http.client.methods.HttpHead;
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import org.apache.http.impl.client.CloseableHttpClient;
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import org.apache.http.impl.client.HttpClientBuilder;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* @author a.kohlbecker
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* @date Oct 28, 2015
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*
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*/
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public class Neo4jStoreUpdater {
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protected Logger logger = LoggerFactory.getLogger(Neo4jStoreUpdater.class);
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private final URI testUrl;
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private final Neo4jStore store;
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private long interval_ms;
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private String[] resources = new String[0];
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public Neo4jStoreUpdater(Neo4jStore store, String testUrl) throws URISyntaxException {
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this.testUrl = new URI(testUrl);
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this.store = store;
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}
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/**
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* @param lastModified
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* @return
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*/
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private Date getRemoteLastModified() {
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Date lastModified = null;
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CloseableHttpClient client = HttpClientBuilder.create().build();
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HttpHead request = new HttpHead(testUrl);
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try {
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HttpResponse response = client.execute(request);
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Header lastModifiedH = response.getFirstHeader("Last-Modified");
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lastModified = DateUtil.parseDate(lastModifiedH.getValue());
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logger.debug("Last-Modified: " + lastModifiedH.getValue());
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} catch (ClientProtocolException e) {
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logger.error("ClientProtocolException, if this problem persists it will block from updating neo4jStore", e);
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} catch (DateParseException e) {
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logger.error("Could not parse Last-Modified value from HTTP response, if this problem persists it will block from updating neo4jStore");
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} catch (IOException e) {
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logger.error("IOException, if this problem persists it will block from updating the neo4jStore", e);
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} finally {
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try {
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client.close();
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} catch (IOException e) {
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// IGNORE //
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}
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}
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return lastModified;
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}
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private Date checkNewerVersion() {
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logger.info("polling for updates at " + testUrl.toString());
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Date lastModified = getRemoteLastModified();
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if(store.getLastModified() == null || lastModified != null && lastModified.after(store.getLastModified())) {
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logger.info("remote resource is more recent: " + DateUtil.formatDate(lastModified));
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return lastModified;
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}
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return null;
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}
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public void addResources(String ... resources) throws URISyntaxException {
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this.resources = resources;
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}
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public void watch(int intervalMinutes) {
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if(isRunningAsTest()) {
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updateIfNeeded();
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} else {
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this.interval_ms = 1000 * 60 * intervalMinutes;
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Thread updateThread = new Thread() {
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@Override
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public void run() {
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updateIfNeeded();
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try {
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sleep(interval_ms);
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} catch (InterruptedException e) {
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logger.info("Neo4jStoreUpdater has been interrupted");
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}
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}
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};
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updateThread.start();
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}
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}
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/**
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* @return
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*/
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private boolean isRunningAsTest() {
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StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
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for (StackTraceElement stackTraceElement : stackTrace) {
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if(stackTraceElement.getClassName().startsWith("org.junit.runners")) {
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return true;
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}
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}
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return false;
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}
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/**
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* @param neo4jStore
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*/
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public void updateStore(Date lastModified) {
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logger.info("Starting store update");
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try {
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store.loadIntoStore(resources);
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store.setLastModified(lastModified);
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} catch (Exception e) {
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throw new RuntimeException("Loading "
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+ Arrays.toString(resources) +
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" into Neo4jStore failed", e);
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}
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logger.info("Store update done.");
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}
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/**
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*
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*/
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private void updateIfNeeded() {
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Date lastModified = checkNewerVersion();
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if(lastModified != null) {
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updateStore(lastModified);
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}
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}
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}
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