112 lines
3.8 KiB
Java
112 lines
3.8 KiB
Java
import static org.neo4j.driver.Values.parameters;
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import java.time.Duration;
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import java.util.*;
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import java.util.concurrent.TimeUnit;
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import org.neo4j.driver.AuthTokens;
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import org.neo4j.driver.Config;
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import org.neo4j.driver.Driver;
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import org.neo4j.driver.GraphDatabase;
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import org.neo4j.driver.Record;
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import org.neo4j.driver.Result;
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import org.neo4j.driver.Session;
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import org.neo4j.driver.Transaction;
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import org.neo4j.driver.TransactionConfig;
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import org.neo4j.driver.Value;
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import org.neo4j.driver.exceptions.ClientException;
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import org.neo4j.driver.exceptions.TransientException;
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public class Metadata {
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public static String createPerson(Transaction tx, String name) {
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Result result =
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tx.run("CREATE (a:Person {name: $name}) RETURN a.name", parameters("name", name));
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return result.single().get(0).asString();
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}
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public static void checkMd(Result result) {
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int n = 0;
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while (result.hasNext()) {
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Record r = result.next();
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Value md = r.get("metadata");
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if (md != null && Objects.equals(md.get("ver").asString(), "transaction")
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&& Objects.equals(md.get("str").asString(), "oho")
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&& Objects.equals(md.get("num").asInt(), 456)) {
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n = n + 1;
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} else if (md != null && Objects.equals(md.get("ver").asString(), "session")
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&& Objects.equals(md.get("str").asString(), "aha")
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&& Objects.equals(md.get("num").asInt(), 123)) {
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n = n + 1;
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}
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}
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if (n == 0) {
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System.out.println("Error while reading metadata!");
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System.exit(1);
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}
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}
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public static void main(String[] args) {
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Config config = Config.builder()
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.withoutEncryption()
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.withMaxTransactionRetryTime(0, TimeUnit.SECONDS)
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.build();
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Driver driver =
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GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("neo4j", "1234"), config);
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try (Session session = driver.session()) {
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// Explicit transaction
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System.out.println("Checking explicit transaction metadata...");
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try {
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TransactionConfig tx_config =
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TransactionConfig.builder()
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.withTimeout(Duration.ofSeconds(2))
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.withMetadata(Map.ofEntries(Map.entry("ver", "transaction"),
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Map.entry("str", "oho"), Map.entry("num", 456)))
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.build();
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Transaction tx = session.beginTransaction(tx_config);
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tx.run("MATCH (n) RETURN n LIMIT 1");
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// Check the metadata from another thread
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try {
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Runnable checkTx = new Runnable() {
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public void run() {
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try (Session s = driver.session()) {
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checkMd(s.run("SHOW TRANSACTIONS"));
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} catch (ClientException e) {
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System.out.println(e);
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}
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}
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};
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Thread thread = new Thread(checkTx);
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thread.start();
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thread.join();
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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tx.commit();
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} catch (ClientException e) {
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System.out.println(e);
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}
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// Implicit transaction
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System.out.println("Checking implicit transaction metadata...");
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try {
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TransactionConfig tx_config = TransactionConfig.builder()
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.withTimeout(Duration.ofSeconds(2))
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.withMetadata(Map.ofEntries(Map.entry("ver", "session"),
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Map.entry("str", "aha"), Map.entry("num", 123)))
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.build();
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checkMd(session.run("SHOW TRANSACTIONS", tx_config));
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} catch (ClientException e) {
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System.out.println(e);
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}
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System.out.println("All ok!");
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} catch (Exception e) {
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System.out.println(e);
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System.exit(1);
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}
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driver.close();
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}
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}
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