Added ContextCache
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package org.gcube.informationsystem.resourceregistry.api.utils;
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import java.util.ArrayList;
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import java.util.Calendar;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.UUID;
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import java.util.concurrent.TimeUnit;
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import org.gcube.informationsystem.context.impl.entities.ContextImpl;
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import org.gcube.informationsystem.context.impl.relations.IsParentOfImpl;
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import org.gcube.informationsystem.context.reference.entities.Context;
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import org.gcube.informationsystem.context.reference.relations.IsParentOf;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class ContextCache {
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private static Logger logger = LoggerFactory.getLogger(ContextCache.class);
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// in millisec
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public static final long DEFAULT_EXPIRING_TIMEOUT;
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public static int expiringTimeout;
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static {
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DEFAULT_EXPIRING_TIMEOUT = TimeUnit.HOURS.toMillis(6);
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expiringTimeout = (int) DEFAULT_EXPIRING_TIMEOUT;
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}
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public static void setExpiringTimeout(int expiringTimeout) {
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ContextCache.expiringTimeout = expiringTimeout;
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}
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protected static ContextCache singleton;
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public synchronized static ContextCache getInstance() {
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Calendar now = Calendar.getInstance();
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if(singleton!=null && now.after(singleton.expiringTime)) {
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logger.debug("Context Cache has been expired. It must be renewed.");
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singleton = null;
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}
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if(singleton==null) {
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singleton = new ContextCache();
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singleton.creationTime = Calendar.getInstance();
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singleton.creationTime.setTimeInMillis(now.getTimeInMillis());
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singleton.expiringTime = Calendar.getInstance();
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singleton.expiringTime.setTimeInMillis(now.getTimeInMillis());
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singleton.expiringTime.add(Calendar.MILLISECOND, expiringTimeout);
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}
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return singleton;
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}
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// in millisec used for logging purposes only
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protected Calendar creationTime;
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// in millisec
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protected Calendar expiringTime;
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protected List<Context> contexts;
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protected Map<UUID, Context> uuidToContext;
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protected Map<UUID, String> uuidToContextFullName;
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protected Map<String, UUID> contextFullNameToUUID;
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public ContextCache() {
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contexts = null;
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uuidToContext = null;
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uuidToContextFullName = null;
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contextFullNameToUUID = null;
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}
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public synchronized List<Context> getContexts() {
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return contexts;
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}
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public synchronized void setContexts(List<Context> contexts) {
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this.contexts = new ArrayList<>();
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this.uuidToContext = new HashMap<>();
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for(Context c : contexts) {
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UUID uuid = c.getHeader().getUUID();
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Context context = new ContextImpl(c.getName());
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context.setHeader(c.getHeader());
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this.contexts.add(context);
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this.uuidToContext.put(uuid, context);
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}
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for(Context c : contexts) {
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UUID uuid = c.getHeader().getUUID();
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Context context = this.uuidToContext.get(uuid);
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if(c.getParent()!=null) {
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IsParentOf ipo = c.getParent();
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UUID parentUUID = ipo.getSource().getHeader().getUUID();
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Context parent = this.uuidToContext.get(parentUUID);
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IsParentOf isParentOf = new IsParentOfImpl(parent, context);
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isParentOf.setHeader(ipo.getHeader());
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parent.addChild(isParentOf);
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context.setParent(isParentOf);
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}
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}
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this.uuidToContextFullName = new HashMap<>();
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this.contextFullNameToUUID = new HashMap<>();
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for(Context context : contexts) {
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UUID uuid = context.getHeader().getUUID();
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String fullName = getContextFullName(context);
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this.uuidToContextFullName.put(uuid, fullName);
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this.contextFullNameToUUID.put(fullName, uuid);
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}
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}
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private String getContextFullName(Context context) {
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StringBuilder stringBuilder = new StringBuilder();
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IsParentOf ipo = context.getParent();
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if(ipo!=null) {
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Context c = ipo.getSource();
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c = uuidToContext.get(c.getHeader().getUUID());
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String parentFullName = getContextFullName(c);
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stringBuilder.append(parentFullName);
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}
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stringBuilder.append("/");
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stringBuilder.append(context.getName());
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return stringBuilder.toString();
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}
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public String getContextFullNameByUUID(UUID uuid) {
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return uuidToContextFullName.get(uuid);
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}
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public UUID getUUIDByFullName(String fullName) {
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return contextFullNameToUUID.get(fullName);
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}
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public Context getContextByUUID(UUID uuid) {
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return uuidToContext.get(uuid);
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}
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/**
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* @return an Map containing UUID to Context FullName association
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*/
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public Map<UUID, String> getUUIDToContextFullNameAssociation() {
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return new HashMap<>(uuidToContextFullName);
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}
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/**
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* @return an Map containing Context FullName to UUID association
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*/
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public Map<String, UUID> getContextFullNameToUUIDAssociation() {
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return new HashMap<>(contextFullNameToUUID);
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}
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}
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