From 6ad973b7090d49b22a3c548afb70a1d1e081a745 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20Sch=C3=A4rtl?= <andreas@schaertl.me>
Date: Tue, 5 May 2020 10:56:44 +0200
Subject: [PATCH] Run ULO query from code
- This uses the RDF4J library which is what GraphDB is based on.
Though it also supports other backends.
- The API is kinda nice tbh.
---
graphdb/graphcli/pom.xml | 11 ++++++-
.../java/me/schaertl/graphcli/GraphDB.java | 31 ++++++++++++-------
.../main/java/me/schaertl/graphcli/Main.java | 8 +++--
.../graphcli/src/main/resources/logback.xml | 11 +++++++
4 files changed, 47 insertions(+), 14 deletions(-)
create mode 100644 graphdb/graphcli/src/main/resources/logback.xml
diff --git a/graphdb/graphcli/pom.xml b/graphdb/graphcli/pom.xml
index 2705ebf..bf388d2 100644
--- a/graphdb/graphcli/pom.xml
+++ b/graphdb/graphcli/pom.xml
@@ -11,11 +11,20 @@
<maven.compiler.target>1.11</maven.compiler.target>
</properties>
<dependencies>
- <!-- https://mvnrepository.com/artifact/com.ontotext.graphdb/graphdb-free-runtime -->
<dependency>
<groupId>com.ontotext.graphdb</groupId>
<artifactId>graphdb-free-runtime</artifactId>
<version>9.2.0</version>
</dependency>
+ <dependency>
+ <groupId>org.slf4j</groupId>
+ <artifactId>slf4j-api</artifactId>
+ <version>1.7.30</version>
+ </dependency>
+ <dependency>
+ <groupId>ch.qos.logback</groupId>
+ <artifactId>logback-core</artifactId>
+ <version>1.2.3</version>
+ </dependency>
</dependencies>
</project>
\ No newline at end of file
diff --git a/graphdb/graphcli/src/main/java/me/schaertl/graphcli/GraphDB.java b/graphdb/graphcli/src/main/java/me/schaertl/graphcli/GraphDB.java
index 2b3cc44..fbbca2a 100644
--- a/graphdb/graphcli/src/main/java/me/schaertl/graphcli/GraphDB.java
+++ b/graphdb/graphcli/src/main/java/me/schaertl/graphcli/GraphDB.java
@@ -7,6 +7,9 @@ import org.eclipse.rdf4j.repository.RepositoryException;
import org.eclipse.rdf4j.repository.manager.RemoteRepositoryManager;
import org.eclipse.rdf4j.repository.manager.RepositoryManager;
+import java.util.Collection;
+import java.util.logging.LogManager;
+
/**
* Wrapper around various RDF4J methods. Represents a connection to a GraphDB
* instance on the network.
@@ -30,20 +33,26 @@ public class GraphDB implements AutoCloseable {
* @throws RepositoryException If connecting to the server or repository failed.
*/
public GraphDB(String serverURL, String repository) throws RepositoryException {
- this.manager = new RemoteRepositoryManager(serverURL);
- this.manager.init();
+ try {
+ this.manager = new RemoteRepositoryManager(serverURL);
+ this.manager.init();
+ final Collection<Repository> rs = this.manager.getAllRepositories();
- this.repository = this.manager.getRepository(repository);
- if (this.repository == null) {
- this.manager.shutDown();
- throw new RepositoryException(String.format("no repository with name %s", repository));
- }
+ this.repository = this.manager.getRepository(repository);
+ if (this.repository == null) {
+ this.manager.shutDown();
+ throw new RepositoryException(String.format("no repository with name %s", repository));
+ }
- try {
this.connection = this.repository.getConnection();
- } finally {
- this.manager.shutDown();
- this.repository.shutDown();
+ } catch (Exception e) {
+ try {
+ this.close();
+ } catch (Exception ce) {
+ // ignore the close exception; we have enough already
+ }
+
+ throw e;
}
}
diff --git a/graphdb/graphcli/src/main/java/me/schaertl/graphcli/Main.java b/graphdb/graphcli/src/main/java/me/schaertl/graphcli/Main.java
index 8143cb9..bfa5318 100644
--- a/graphdb/graphcli/src/main/java/me/schaertl/graphcli/Main.java
+++ b/graphdb/graphcli/src/main/java/me/schaertl/graphcli/Main.java
@@ -3,6 +3,8 @@ package me.schaertl.graphcli;
import org.eclipse.rdf4j.model.Statement;
import org.eclipse.rdf4j.repository.RepositoryConnection;
import org.eclipse.rdf4j.repository.RepositoryResult;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
@@ -12,6 +14,8 @@ public class Main {
private static final String REPOSITORY = "dump";
private static final int LIMIT = 100;
+ private static final Logger log = LoggerFactory.getLogger(Main.class);
+
private static void hello() throws Exception {
try (final GraphDB db = new GraphDB(SERVER_URL, REPOSITORY)) {
final RepositoryConnection connection = db.connection();
@@ -19,7 +23,7 @@ public class Main {
final RepositoryResult<Statement> result = connection.getStatements(null, ULO.INDUCTIVE_ON, null, true);
for (Statement s : take(result, LIMIT)) {
- System.out.printf("%s INDUCTIVE ON %s", s.getSubject(), s.getObject());
+ log.info("{} INDUCTIVE ON {}", s.getSubject(), s.getObject());
}
}
}
@@ -33,7 +37,7 @@ public class Main {
private static List<Statement> take(RepositoryResult<Statement> result, int n) {
final List<Statement> l = new ArrayList<>(n);
- for (int i = 0; i < LIMIT && result.hasNext(); i++) {
+ for (int i = 0; i < n && result.hasNext(); i++) {
final Statement s = result.next();
l.add(s);
}
diff --git a/graphdb/graphcli/src/main/resources/logback.xml b/graphdb/graphcli/src/main/resources/logback.xml
new file mode 100644
index 0000000..6156c21
--- /dev/null
+++ b/graphdb/graphcli/src/main/resources/logback.xml
@@ -0,0 +1,11 @@
+<configuration>
+ <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+ <encoder>
+ <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+ </encoder>
+ </appender>
+
+ <root level="INFO">
+ <appender-ref ref="STDOUT" />
+ </root>
+</configuration>
\ No newline at end of file
--
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