Add blazegraph sample

Author: kmcginnes

samples/README.md

@@ -10,3 +10,9 @@ sample data and shows how to configure Graph Explorer to connect to it
 automatically with a default connection.
 
 [Air Routes](./air_routes/readme.md)
+
+## Social Network with Blazegraph
+
+This sample uses Blazegraph as the RDF database pre-loaded with sample social network data and shows how to configure Graph Explorer to connect to it automatically with a default connection.
+
+[Blazegraph](./blazegraph/readme.md)

samples/blazegraph/README.md

@@ -0,0 +1,53 @@
+# Blazegraph Sample
+
+| Database     | Query Language | Data Source |
+| ------------ | -------------- | ----------- |
+| [Blazegraph] | [SPARQL]       | Sample RDF  |
+
+[Blazegraph]: https://blazegraph.com/
+[SPARQL]: https://www.w3.org/TR/sparql11-overview/
+
+This sample uses Blazegraph as the RDF database pre-loaded with sample social
+network data and shows how to configure Graph Explorer to connect to it
+automatically with a default connection.
+
+> [!NOTE]  
+> The data is not persisted between restarts of the Docker container.
+
+## Sample Data
+
+The sample includes a small social network with:
+
+- 4 people (Alice, Bob, Charlie, Diana)
+- 3 organizations (TechCorp, Startup, Nonprofit)
+- Relationships showing who knows whom and where people work
+
+## Prerequisites
+
+- [Docker](https://docs.docker.com/get-docker/) installed on your machine
+- [Docker Compose](https://docs.docker.com/compose/install/) installed on your
+  machine
+
+## Running Sample
+
+1. Clone or download this repository
+2. Navigate to the `samples/blazegraph` directory
+   ```
+   cd samples/blazegraph
+   ```
+3. Run the following command to start both services
+   ```
+   docker compose up
+   ```
+4. Wait for both services to start (Blazegraph will load sample data
+   automatically)
+5. Open the browser and navigate to:
+   [http://localhost:8080/explorer](http://localhost:8080/explorer)
+
+## Stopping the Sample
+
+To stop the services, press `Ctrl+C` in the terminal or run:
+
+```
+docker compose down
+```

samples/blazegraph/docker-compose.yml

@@ -0,0 +1,35 @@
+version: "3.9"
+
+services:
+  database:
+    image: openkbs/blazegraph:latest
+    restart: unless-stopped
+    environment:
+      - JAVA_OPTS=-Xmx2g
+    volumes:
+      - ./init:/init
+      - ./data:/var/blazegraph
+    command:
+      bash -c "java -server -Xmx2g -jar blazegraph.jar & /init/load-data.sh &&
+      wait"
+    working_dir: /home/developer/blazegraph/
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9999/blazegraph"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+
+  graph-explorer:
+    image: public.ecr.aws/neptune/graph-explorer:latest
+    ports:
+      - "8090:80"
+    environment:
+      - HOST=localhost
+      - PUBLIC_OR_PROXY_ENDPOINT=http://localhost:8090
+      - GRAPH_TYPE=sparql
+      - USING_PROXY_SERVER=true
+      - PROXY_SERVER_HTTPS_CONNECTION=false
+      - GRAPH_CONNECTION_URL=http://database:9999/blazegraph
+    depends_on:
+      database:
+        condition: service_healthy

samples/blazegraph/init/load-data.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+set -e
+
+MARKER_FILE="/var/blazegraph/.data_loaded"
+
+# If the marker file exists, skip loading
+if [ -f "$MARKER_FILE" ]; then
+  echo "Sample data already loaded — skipping."
+  exit 0
+fi
+
+# Wait for Blazegraph to become available
+echo "Waiting for Blazegraph to start..."
+until curl -s http://localhost:9999/blazegraph >/dev/null; do
+  sleep 2
+done
+
+echo "Blazegraph is up! Loading sample.ttl..."
+
+# Load the RDF data into the default namespace (kb)
+curl -s -X POST \
+  -H 'Content-Type: text/turtle' \
+  --data-binary @/init/sample-data.ttl \
+  "http://localhost:9999/blazegraph/namespace/kb/sparql" \
+  -o /dev/null
+
+# Create a marker so we know data has been loaded
+touch "$MARKER_FILE"
+echo "✅ Data loaded successfully and marker file created."

samples/blazegraph/init/sample-data.ttl

@@ -0,0 +1,42 @@
+@prefix ex: <http://example.org/> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+
+# People
+ex:alice a foaf:Person ;
+    foaf:name "Alice Johnson" ;
+    foaf:age 30 ;
+    foaf:knows ex:bob, ex:charlie ;
+    foaf:worksFor ex:techcorp .
+
+ex:bob a foaf:Person ;
+    foaf:name "Bob Smith" ;
+    foaf:age 25 ;
+    foaf:knows ex:alice, ex:diana ;
+    foaf:worksFor ex:startup .
+
+ex:charlie a foaf:Person ;
+    foaf:name "Charlie Brown" ;
+    foaf:age 35 ;
+    foaf:knows ex:alice, ex:diana ;
+    foaf:worksFor ex:techcorp .
+
+ex:diana a foaf:Person ;
+    foaf:name "Diana Prince" ;
+    foaf:age 28 ;
+    foaf:knows ex:bob, ex:charlie ;
+    foaf:worksFor ex:nonprofit .
+
+# Organizations
+ex:techcorp a foaf:Organization ;
+    foaf:name "TechCorp Inc." ;
+    rdfs:label "Technology Corporation" .
+
+ex:startup a foaf:Organization ;
+    foaf:name "Innovative Startup" ;
+    rdfs:label "Startup Company" .
+
+ex:nonprofit a foaf:Organization ;
+    foaf:name "Community Nonprofit" ;
+    rdfs:label "Non-profit Organization" .