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added Caching support (localStorage and HashMap)
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4 files changed

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‎src/main/java/at/gmi/nordborglab/widgets/geneviewer/client/datasource/Cache.java

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package at.gmi.nordborglab.widgets.geneviewer.client.datasource;
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public interface Cache {
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void put(Object key, Object value);
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Object get(Object key);
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void remove(Object key);
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void clear();
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}

‎src/main/java/at/gmi/nordborglab/widgets/geneviewer/client/datasource/DefaultCacheImpl.java

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package at.gmi.nordborglab.widgets.geneviewer.client.datasource;
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import java.util.HashMap;
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public class DefaultCacheImpl implements Cache {
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private HashMap<Object, Object> map;
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public DefaultCacheImpl() {
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this.map = new HashMap<Object, Object>();
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}
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@Override
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public void put(Object key, Object value) {
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if (key == null) {
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throw new NullPointerException("key is null");
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}
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if (value == null) {
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throw new NullPointerException("value is null");
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}
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map.put(key, value);
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}
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@Override
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public Object get(Object key) {
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// Check for null as Cache should not store null values / keys
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if (key == null) {
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throw new NullPointerException("key is null");
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}
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return map.get(key);
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}
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@Override
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public void remove(Object key) {
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map.remove(key);
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}
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@Override
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public void clear() {
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map.clear();
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}
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}

‎src/main/java/at/gmi/nordborglab/widgets/geneviewer/client/datasource/LocalStorageImpl.java

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package at.gmi.nordborglab.widgets.geneviewer.client.datasource;
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import java.util.ArrayList;
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import java.util.List;
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import com.google.gwt.core.client.JavaScriptObject;
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import com.google.gwt.core.client.JsArray;
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import com.google.gwt.core.client.JsonUtils;
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import com.google.gwt.json.client.JSONArray;
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import com.google.gwt.json.client.JSONObject;
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import com.google.gwt.json.client.JSONValue;
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import com.google.gwt.storage.client.Storage;
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import com.google.gwt.visualization.client.DataTable;
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public class LocalStorageImpl implements Cache{
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public static enum TYPE {LOCAL,SESSION}
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private TYPE type;
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private Storage cacheStorage = null;
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public LocalStorageImpl(TYPE type) throws Exception {
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this.type = type;
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if (type == TYPE.LOCAL) {
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cacheStorage = Storage.getLocalStorageIfSupported();
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}
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else {
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cacheStorage = Storage.getSessionStorageIfSupported();
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}
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if (cacheStorage == null) {
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throw new Exception("LocalStorage not supported");
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}
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}
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@Override
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public void put(Object key, Object value) {
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if (key == null) {
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throw new NullPointerException("key is null");
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}
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if (value == null) {
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throw new NullPointerException("value is null");
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}
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String jsonData = null;
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if (value instanceof List) {
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JSONArray array = new JSONArray();
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int index = 0;
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for (Object val:(List)value) {
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array.set(index,new JSONObject((JavaScriptObject)val));
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index = index +1;
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}
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jsonData = array.toString();
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}
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else
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{
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jsonData = ((CustomDataTable)value).toJSON();
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}
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cacheStorage.setItem(key.toString(), jsonData);
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}
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@Override
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public Object get(Object key) {
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if (key == null) {
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throw new NullPointerException("key is null");
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}
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String jsonDataString = cacheStorage.getItem(key.toString());
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if (jsonDataString == null) {
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return null;
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}
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Object data = null;
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JavaScriptObject jsonData = JsonUtils.safeEval(jsonDataString);
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if (!key.equals("genomestatslist"))
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data = DataTable.create((JavaScriptObject)jsonData);
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else if (jsonData instanceof JsArray){
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JsArray<GenomeStat> jsonStats = (JsArray<GenomeStat>)jsonData;
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List<GenomeStat> stats = new ArrayList<GenomeStat>();
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for (int i = 0;i<jsonStats.length();i++) {
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stats.add(jsonStats.get(i));
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}
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data = (Object)stats;
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}
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return data;
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}
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@Override
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public void remove(Object key) {
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cacheStorage.removeItem(key.toString());
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}
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@Override
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public void clear() {
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cacheStorage.clear();
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}
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public TYPE getType() {
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return type;
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}
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}

‎src/main/java/at/gmi/nordborglab/widgets/geneviewer/client/datasource/impl/JBrowseCacheDataSourceImpl.java

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package at.gmi.nordborglab.widgets.geneviewer.client.datasource.impl;
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import java.util.List;
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import com.google.gwt.visualization.client.DataTable;
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import at.gmi.nordborglab.widgets.geneviewer.client.datasource.Cache;
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import at.gmi.nordborglab.widgets.geneviewer.client.datasource.FetchGenomeStatsDataCallback;
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import at.gmi.nordborglab.widgets.geneviewer.client.datasource.FetchGenomeStatsListCallback;
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import at.gmi.nordborglab.widgets.geneviewer.client.datasource.GenomeStat;
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public class JBrowseCacheDataSourceImpl extends JBrowseDataSourceImpl {
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protected final Cache cache;
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private static String genomeStatsListKey ="genomestatslist";
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public JBrowseCacheDataSourceImpl(String url,final Cache cache) {
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super(url);
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this.cache = cache;
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}
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@Override
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public void fetchGenomeStatsData(List<GenomeStat> genomeStats, String chr,
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final FetchGenomeStatsDataCallback callback) {
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final String genomeStatsDataKey = getStatUrl(genomeStats)+"_"+chr;
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Object value = cache.get(genomeStatsDataKey);
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if (value != null && value instanceof DataTable) {
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callback.onFetchGenomeStats((DataTable)value);
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}
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else {
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super.fetchGenomeStatsData(genomeStats, chr,new FetchGenomeStatsDataCallback() {
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@Override
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public void onFetchGenomeStats(DataTable statsDataTable) {
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cache.put(genomeStatsDataKey, statsDataTable);
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callback.onFetchGenomeStats(statsDataTable);
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}
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});
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}
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}
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@Override
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public void fetchGenomeStatsList(final FetchGenomeStatsListCallback callback) {
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Object value = cache.get(genomeStatsListKey);
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if (value != null && value instanceof List) {
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callback.onFetchGenomeStatsList((List<GenomeStat>)value);
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}
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else {
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super.fetchGenomeStatsList(new FetchGenomeStatsListCallback() {
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@Override
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public void onFetchGenomeStatsList(List<GenomeStat> genomeStats) {
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cache.put(genomeStatsListKey, genomeStats);
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callback.onFetchGenomeStatsList(genomeStats);
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}
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});
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}
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}
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}

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