265 lines
9.1 KiB
Java
265 lines
9.1 KiB
Java
package eu.dnetlib.enabling.locators;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.util.*;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Maps;
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import com.google.common.collect.Sets;
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import eu.dnetlib.common.rmi.BaseService;
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import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpException;
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import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpService;
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import eu.dnetlib.enabling.tools.registration.ServiceNameResolver;
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import eu.dnetlib.enabling.tools.registration.ValidatingServiceRegistrationManagerImpl;
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import eu.dnetlib.miscutils.collections.EnsureCollection;
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import eu.dnetlib.soap.cxf.StandaloneCxfEndpointReferenceBuilder;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.lang3.math.NumberUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.dom4j.Document;
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import org.dom4j.DocumentException;
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import org.dom4j.Element;
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import org.dom4j.io.SAXReader;
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import org.springframework.beans.BeansException;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Required;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ApplicationContextAware;
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public class DefaultUniqueServiceLocator implements UniqueServiceLocator, ApplicationContextAware {
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private ApplicationContext appContext;
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private Comparator<ServiceRunningInstance> defaultComparator; // = new
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// PreferLocalRunningInstanceComparator();
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/**
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* An instance of isLookupService (local or stub)
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*/
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@Autowired
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private ISLookUpService isLookupService;
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@Autowired
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private ServiceNameResolver serviceNameResolver;
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/**
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* XML Parser
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*/
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private SAXReader reader = new SAXReader();
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/**
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* build epr.
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*/
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@Autowired
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private StandaloneCxfEndpointReferenceBuilder eprBuilder;
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/**
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* logger.
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*/
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private static final Log log = LogFactory.getLog(DefaultUniqueServiceLocator.class);
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@Override
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public <T extends BaseService> T getService(final Class<T> clazz) {
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return getService(clazz, true);
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}
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@Override
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public <T extends BaseService> T getService(final Class<T> clazz, final Comparator<ServiceRunningInstance> comparator) {
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final String serviceName = serviceNameResolver.getName(clazz);
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return findRunningInstances(serviceName, comparator).get(0).obtainClient(clazz, eprBuilder);
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}
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@Override
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public <T extends BaseService> T getService(final Class<T> clazz, final String profileId) {
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final String profile = obtainServiceProfile(profileId);
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try {
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return obtainRunningInstance(profile, obtainLocalServices()).obtainClient(clazz, eprBuilder);
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} catch (Exception e) {
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log.error("cannot instantiate service from id: " + profileId, e);
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throw new IllegalStateException("cannot instantiate service from id: " + profileId, e);
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}
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}
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@Override
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public <T extends BaseService> T getService(final Class<T> clazz, final boolean local) {
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if (clazz.isInstance(isLookupService)) return clazz.cast(isLookupService);
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if (local) {
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try {
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final Map<String, T> beans = appContext.getBeansOfType(clazz);
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if ((beans != null) && !beans.isEmpty()) return beans.values().iterator().next();
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} catch (Throwable e) {
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log.warn("No beans found in context, class " + clazz);
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}
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}
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return getService(clazz, defaultComparator);
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}
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@Override
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public <T extends BaseService> String getServiceId(final Class<T> clazz) {
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return getServiceId(clazz, defaultComparator);
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}
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@Override
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public <T extends BaseService> String getServiceId(final Class<T> clazz, final Comparator<ServiceRunningInstance> comparator) {
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return findRunningInstances(serviceNameResolver.getName(clazz), comparator).get(0).getServiceId();
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}
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@Override
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public <T extends BaseService> String getServiceId(final Class<T> clazz, final String profileId) {
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final String profile = obtainServiceProfile(profileId);
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final ServiceRunningInstance instance = obtainRunningInstance(profile, obtainLocalServices());
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return instance.getServiceId();
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}
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@Override
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public <T extends BaseService> Set<T> getAllServices(final Class<T> clazz) {
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final Set<T> res = Sets.newHashSet();
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for (ServiceRunningInstance instance : findRunningInstances(serviceNameResolver.getName(clazz), null)) {
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res.add(instance.obtainClient(clazz, eprBuilder));
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}
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return res;
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}
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@Override
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public <T extends BaseService> Set<String> getAllServiceIds(final Class<T> clazz) {
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final Set<String> res = Sets.newHashSet();
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for (ServiceRunningInstance instance : findRunningInstances(serviceNameResolver.getName(clazz), null)) {
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res.add(instance.getServiceId());
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}
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return res;
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}
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private synchronized <T extends BaseService> ServiceRunningInstance obtainRunningInstance(final String profile, final Map<String, BaseService> locals) {
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try {
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final Document doc = reader.read(new StringReader(profile));
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final String url = doc.valueOf("//PROTOCOL[@name = 'SOAP']/@address");
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final String id = doc.valueOf("//RESOURCE_IDENTIFIER/@value");
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final Map<String, String> props = Maps.newHashMap();
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final BaseService local = locals.containsKey(id) ? locals.get(id) : null;
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final int usedDiskpace = NumberUtils.toInt(doc.valueOf("//USED_DISKSPACE"), 0);
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final int handledDatastructures = NumberUtils.toInt(doc.valueOf("//HANDLED_DATASTRUCTURE"), 0);;
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for (Object o : doc.selectNodes("//SERVICE_PROPERTIES/PROPERTY")) {
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final Element p = (Element) o;
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props.put(p.valueOf("@key"), p.valueOf("@value"));
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}
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return new ServiceRunningInstance(id, url, local, usedDiskpace, handledDatastructures, props);
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} catch (DocumentException e) {
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log.error("Error parsing profile: " + profile, e);
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throw new RuntimeException("Error parsing profile: " + profile, e);
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}
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}
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private List<ServiceRunningInstance> findRunningInstances(final String serviceName, final Comparator<ServiceRunningInstance> comparator) {
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final List<ServiceRunningInstance> list = findRegisteredServices(serviceName);
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if (list.isEmpty()) {
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log.error("Service not found, name: " + serviceName);
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throw new RuntimeException("Service not found, name: " + serviceName);
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}
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if (comparator != null) {
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Collections.sort(list, comparator);
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}
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return list;
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}
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private List<ServiceRunningInstance> findRegisteredServices(final String serviceName) {
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log.debug("searching for service: " + serviceName);
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final String xquery = "for $x in collection('/db/DRIVER/ServiceResources/" + serviceName + "ResourceType') return $x";
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log.debug(xquery);
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try {
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final List<String> services = isLookupService.quickSearchProfile(xquery);
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final List<ServiceRunningInstance> instances = Lists.newArrayList();
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final Map<String, BaseService> locals = obtainLocalServices();
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for (final String source : EnsureCollection.list(services)) {
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final ServiceRunningInstance instance = obtainRunningInstance(source, locals);
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instances.add(instance);
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}
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return instances;
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} catch (final Exception e) {
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throw new IllegalStateException("cannot locate service " + serviceName, e);
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}
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}
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private Map<String, BaseService> obtainLocalServices() {
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final Map<String, BaseService> locals = Maps.newHashMap();
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for (ValidatingServiceRegistrationManagerImpl r : appContext.getBeansOfType(ValidatingServiceRegistrationManagerImpl.class).values()) {
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if (r.getService() instanceof BaseService) {
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if (!StringUtils.isBlank(r.getProfileId())) {
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final BaseService baseService = (BaseService) r.getService();
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if (baseService != null) {
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locals.put(r.getProfileId(), baseService);
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log.debug(" -> Service: " + r.getService().getClass().getName() + " has id " + r.getServiceProfile().getResourceId());
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}
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}
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}
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}
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return locals;
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}
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private String obtainServiceProfile(final String profileId) {
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final StringWriter sw = new StringWriter();
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sw.append("let $uri:=/RESOURCE_PROFILE/HEADER[./RESOURCE_IDENTIFIER/@value='");
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sw.append(profileId);
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sw.append("']/RESOURCE_URI/@value/string()");
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sw.append("\n\n");
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sw.append("for $x in collection('/db/DRIVER/ServiceResources')");
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sw.append("\n");
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sw.append("where $x/RESOURCE_PROFILE/HEADER/RESOURCE_URI/@value = $uri");
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sw.append("\n");
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sw.append("return $x");
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final String xq = sw.toString();
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try {
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return isLookupService.getResourceProfileByQuery(xq);
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} catch (ISLookUpException e) {
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log.error("cannot locate service using query: " + xq, e);
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throw new IllegalStateException("cannot locate service using query: " + xq, e);
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}
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}
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@Override
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public void setApplicationContext(final ApplicationContext appContext) throws BeansException {
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this.appContext = appContext;
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}
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public Comparator<ServiceRunningInstance> getDefaultComparator() {
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return defaultComparator;
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}
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@Required
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public void setDefaultComparator(final Comparator<ServiceRunningInstance> defaultComparator) {
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this.defaultComparator = defaultComparator;
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}
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public ISLookUpService getIsLookupService() {
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return isLookupService;
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}
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public void setIsLookupService(final ISLookUpService isLookupService) {
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this.isLookupService = isLookupService;
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}
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public ServiceNameResolver getServiceNameResolver() {
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return serviceNameResolver;
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}
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public void setServiceNameResolver(final ServiceNameResolver serviceNameResolver) {
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this.serviceNameResolver = serviceNameResolver;
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}
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}
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