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+per #16541 add missing java samples for persistence query

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Konrad Malawski 2015-06-08 12:26:19 +02:00 • committed by Konrad Malawski
parent 3b94108e0c
commit 3314de4cb9
10 changed files with 589 additions and 92 deletions
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63
akka-docs/rst/java/code/docs/persistence/query/MyEventsByTagJavaPublisher.java
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@ -5,6 +5,7 @@
package docs.persistence.query;
import akka.actor.Cancellable;
import akka.actor.Scheduler;
import akka.japi.Pair;
import akka.japi.pf.ReceiveBuilder;
import akka.persistence.PersistentRepr;
@ -23,6 +24,7 @@ import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import static java.util.stream.Collectors.toList;
@ -39,21 +41,28 @@ class MyEventsByTagJavaPublisher extends AbstractActorPublisher<EventEnvelope> {
private final String CONTINUE = "CONTINUE";
private final int LIMIT = 1000;
private long currentOffset;
private List<EventEnvelope> buf = new ArrayList<>();
private List<EventEnvelope> buf = new LinkedList<>();
private Cancellable continueTask;
public MyEventsByTagJavaPublisher(Connection connection, String tag, Long offset, FiniteDuration refreshInterval) {
public MyEventsByTagJavaPublisher(Connection connection,
String tag,
Long offset,
FiniteDuration refreshInterval) {
this.connection = connection;
this.tag = tag;
this.currentOffset = offset;
this.continueTask = context().system().scheduler().schedule(refreshInterval, refreshInterval, self(), CONTINUE, context().dispatcher(), self());
final Scheduler scheduler = context().system().scheduler();
this.continueTask = scheduler
.schedule(refreshInterval, refreshInterval, self(), CONTINUE,
context().dispatcher(), self());
receive(ReceiveBuilder
.matchEquals(CONTINUE, (in) -> {
query();
deliverBuf();
})
.matchEquals(CONTINUE, (in) -> {
query();
deliverBuf();
})
.match(Cancel.class, (in) -> {
context().stop(self());
})
@ -71,33 +80,33 @@ class MyEventsByTagJavaPublisher extends AbstractActorPublisher<EventEnvelope> {
private void query() {
if (buf.isEmpty()) {
try {
PreparedStatement s = connection.prepareStatement(
"SELECT id, persistent_repr " +
"FROM journal WHERE tag = ? AND id >= ? " +
"ORDER BY id LIMIT ?");
final String query = "SELECT id, persistent_repr " +
"FROM journal WHERE tag = ? AND id >= ? " +
"ORDER BY id LIMIT ?";
try (PreparedStatement s = connection.prepareStatement(query)) {
s.setString(1, tag);
s.setLong(2, currentOffset);
s.setLong(3, LIMIT);
final ResultSet rs = s.executeQuery();
try (ResultSet rs = s.executeQuery()) {
final List<Pair<Long, byte[]>> res = new ArrayList<>(LIMIT);
while (rs.next())
res.add(Pair.create(rs.getLong(1), rs.getBytes(2)));
final List<Pair<Long, byte[]>> res = new ArrayList<>(LIMIT);
while (rs.next())
res.add(Pair.create(rs.getLong(1), rs.getBytes(2)));
if (!res.isEmpty()) {
currentOffset = res.get(res.size() - 1).first();
if (!res.isEmpty()) {
currentOffset = res.get(res.size() - 1).first();
}
buf = res.stream().map(in -> {
final Long id = in.first();
final byte[] bytes = in.second();
final PersistentRepr p = serialization.deserialize(bytes, PersistentRepr.class).get();
return new EventEnvelope(id, p.persistenceId(), p.sequenceNr(), p.payload());
}).collect(toList());
}
buf = res.stream().map(in -> {
final Long id = in.first();
final byte[] bytes = in.second();
final PersistentRepr p = serialization.deserialize(bytes, PersistentRepr.class).get();
return new EventEnvelope(id, p.persistenceId(), p.sequenceNr(), p.payload());
}).collect(toList());
} catch(Exception e) {
onErrorThenStop(e);
}