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RepositoryConnectorInitializer.java
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RepositoryConnectorInitializer.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
* version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.sesame.connector;
import cz.cvut.kbss.ontodriver.config.DriverConfiguration;
import cz.cvut.kbss.ontodriver.sesame.config.SesameConfigParam;
import cz.cvut.kbss.ontodriver.sesame.exceptions.RepositoryCreationException;
import cz.cvut.kbss.ontodriver.sesame.exceptions.RepositoryNotFoundException;
import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
import org.eclipse.rdf4j.model.Model;
import org.eclipse.rdf4j.model.Resource;
import org.eclipse.rdf4j.model.vocabulary.RDF;
import org.eclipse.rdf4j.repository.Repository;
import org.eclipse.rdf4j.repository.RepositoryException;
import org.eclipse.rdf4j.repository.config.RepositoryConfig;
import org.eclipse.rdf4j.repository.config.RepositoryConfigException;
import org.eclipse.rdf4j.repository.config.RepositoryConfigSchema;
import org.eclipse.rdf4j.repository.manager.LocalRepositoryManager;
import org.eclipse.rdf4j.repository.manager.RemoteRepositoryManager;
import org.eclipse.rdf4j.repository.manager.RepositoryManager;
import org.eclipse.rdf4j.repository.manager.RepositoryProvider;
import org.eclipse.rdf4j.repository.sail.SailRepository;
import org.eclipse.rdf4j.repository.sail.config.SailRepositoryConfig;
import org.eclipse.rdf4j.rio.RDFFormat;
import org.eclipse.rdf4j.rio.Rio;
import org.eclipse.rdf4j.sail.config.SailImplConfig;
import org.eclipse.rdf4j.sail.inferencer.fc.SchemaCachingRDFSInferencer;
import org.eclipse.rdf4j.sail.inferencer.fc.config.SchemaCachingRDFSInferencerConfig;
import org.eclipse.rdf4j.sail.memory.MemoryStore;
import org.eclipse.rdf4j.sail.nativerdf.config.NativeStoreConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.net.URI;
import java.util.Optional;
import java.util.Set;
class RepositoryConnectorInitializer {
private static final Logger LOG = LoggerFactory.getLogger(RepositoryConnectorInitializer.class);
private static final String[] KNOWN_REMOTE_SCHEMES = {"http", "https", "ftp"};
private static final String LOCAL_NATIVE_REPO = "repositories/";
private static final String FILE_SCHEME = "file";
private static final String CLASSPATH_PREFIX = "classpath:";
private final DriverConfiguration configuration;
private final int maxReconnectAttempts;
private RepositoryManager manager;
private Repository repository;
RepositoryConnectorInitializer(DriverConfiguration configuration, int maxReconnectAttempts) {
this.configuration = configuration;
this.maxReconnectAttempts = maxReconnectAttempts;
}
void initializeRepository() throws SesameDriverException {
final URI serverUri = configuration.getStorageProperties().getPhysicalURI();
LOG.debug("Initializing connector to repository at {}", serverUri);
try {
final boolean isRemote = isRemoteRepository(serverUri);
if (isRemote) {
this.repository = connectToRemoteRepository(serverUri.toString());
} else {
this.repository = createLocalRepository();
}
verifyRepositoryCreated(serverUri, isRemote);
repository.init();
} catch (RepositoryException | RepositoryConfigException e) {
throw new SesameDriverException("Failed to acquire sesame repository connection.", e);
}
}
private static boolean isRemoteRepository(URI uri) {
final String scheme = uri.getScheme();
for (String s : KNOWN_REMOTE_SCHEMES) {
if (s.equals(scheme)) {
return true;
}
}
return false;
}
private Repository connectToRemoteRepository(String repoUri) {
this.manager = RepositoryProvider.getRepositoryManagerOfRepository(repoUri);
final RemoteRepositoryManager remoteManager = (RemoteRepositoryManager) manager;
final String username = configuration.getStorageProperties().getUsername();
if (username != null) {
final String password = configuration.getStorageProperties().getPassword();
remoteManager.setUsernameAndPassword(username, password);
}
return connectToRemote(repoUri, 1);
}
private Repository connectToRemote(String repoUri, int attempts) {
try {
return manager.getRepository(RepositoryProvider.getRepositoryIdOfRepository(repoUri));
} catch (RepositoryException e) {
if (attempts < maxReconnectAttempts) {
LOG.warn("Unable to connect to repository {}. Error is: {}. Retrying...", repoUri, e.getMessage());
return connectToRemote(repoUri, attempts + 1);
}
LOG.error("Threshold of failed connection attempts reached, throwing exception.");
throw e;
}
}
private Repository createLocalRepository() {
if (configuration.isSet(SesameConfigParam.REPOSITORY_CONFIG)) {
return createRepositoryFromConfig();
}
final URI localUri = configuration.getStorageProperties().getPhysicalURI();
if (!isFileUri(localUri) && configuration.is(SesameConfigParam.USE_VOLATILE_STORAGE)) {
return createInMemoryRepository();
} else {
return createNativeRepository(configuration, localUri.toString());
}
}
private Repository createRepositoryFromConfig() {
LOG.trace("Creating local repository from repository config file.");
final RepositoryConfig repoConfig = loadRepositoryConfig();
this.manager = RepositoryProvider.getRepositoryManager(getRepositoryManagerBaseDir().orElse(""));
manager.addRepositoryConfig(repoConfig);
return manager.getRepository(getRepositoryId());
}
private RepositoryConfig loadRepositoryConfig() {
try (final InputStream is = getConfigFileContent()) {
final Model configModel = Rio.parse(is, "", RDFFormat.TURTLE);
final Set<Resource> resources =
configModel.filter(null, RDF.TYPE, RepositoryConfigSchema.REPOSITORY).subjects();
assert resources.size() == 1;
return RepositoryConfig.create(configModel, resources.iterator().next());
} catch (IOException e) {
throw new RepositoryCreationException("Unable to create repository from the specified configuration.", e);
}
}
private InputStream getConfigFileContent() {
final String configPath = configuration.getProperty(SesameConfigParam.REPOSITORY_CONFIG);
LOG.trace("Loading repository configuration file content from {}.", configPath);
if (configPath.startsWith(CLASSPATH_PREFIX)) {
final InputStream is =
getClass().getClassLoader().getResourceAsStream(configPath.substring(CLASSPATH_PREFIX.length()));
if (is == null) {
throw new RepositoryCreationException(
"Unable to find repository configuration file on classpath location " + configPath);
}
return is;
} else {
try {
return new FileInputStream(new File(configPath));
} catch (FileNotFoundException e) {
throw new RepositoryCreationException("Unable to find repository configuration file at " + configPath,
e);
}
}
}
private Optional<String> getRepositoryManagerBaseDir() {
final String physicalUri = configuration.getStorageProperties().getPhysicalURI().toString();
final String[] tmp = physicalUri.split(LOCAL_NATIVE_REPO);
return tmp.length == 2 ? Optional.of(tmp[0]) : Optional.empty();
}
private String getRepositoryId() {
final String physicalUri = configuration.getStorageProperties().getPhysicalURI().toString();
final String[] tmp = physicalUri.split(LOCAL_NATIVE_REPO);
if (tmp.length != 2) {
return physicalUri;
}
String repoId = tmp[1];
// Get rid of the trailing slash if necessary
return repoId.charAt(repoId.length() - 1) == '/' ? repoId.substring(0, repoId.length() - 1) : repoId;
}
private static boolean isFileUri(URI uri) {
return uri.getScheme() != null && uri.getScheme().equals(FILE_SCHEME);
}
/**
* Creates a local in-memory Sesame repository which is disposed when the VM shuts down.
*/
private Repository createInMemoryRepository() {
LOG.trace("Creating local in-memory repository.");
final MemoryStore ms = new MemoryStore();
if (configuration.is(SesameConfigParam.USE_INFERENCE)) {
return new SailRepository(new SchemaCachingRDFSInferencer(ms));
} else {
return new SailRepository(ms);
}
}
/**
* Creates native repository.
* <p>
* This kind of repository stores data in files and is persistent after the VM shuts down.
*/
private Repository createNativeRepository(DriverConfiguration configuration, String localUri) {
LOG.trace("Creating local native repository at " + localUri);
validateNativeStorePath(localUri);
try {
this.manager = RepositoryProvider.getRepositoryManagerOfRepository(localUri);
final String repoId = getRepositoryId();
final RepositoryConfig cfg = createLocalNativeRepositoryConfig(repoId, configuration);
manager.addRepositoryConfig(cfg);
return manager.getRepository(repoId);
} catch (RepositoryConfigException | RepositoryException e) {
throw new RepositoryCreationException("Unable to create local repository at " + localUri, e);
}
}
private static void validateNativeStorePath(String path) {
if (path.split(LOCAL_NATIVE_REPO).length != 2) {
throw new RepositoryCreationException(
"Unsupported local RDF4J/Sesame repository path. Expected file://path/repositories/id but got " +
path);
}
}
private static RepositoryConfig createLocalNativeRepositoryConfig(String repoId,
DriverConfiguration configuration) {
SailImplConfig backend = new NativeStoreConfig();
if (configuration.is(SesameConfigParam.USE_INFERENCE)) {
backend = new SchemaCachingRDFSInferencerConfig(backend);
}
final SailRepositoryConfig repoType = new SailRepositoryConfig(backend);
return new RepositoryConfig(repoId, repoType);
}
private void verifyRepositoryCreated(URI serverUri, boolean isRemote) {
if (repository == null) {
if (isRemote) {
throw new RepositoryNotFoundException("Unable to reach repository at " + serverUri);
} else {
throw new RepositoryCreationException("Unable to create local repository at " + serverUri);
}
}
}
RepositoryManager getManager() {
return manager;
}
Repository getRepository() {
return repository;
}
}