我尝试将一些组件添加到JPanel。调用public class YourConsumer<T> extends FlinkKafkaConsumerBase<T>
{
public static final long DEFAULT_POLL_TIMEOUT = 100L;
private final long pollTimeout;
public FlinkKafkaConsumer09(String topic, DeserializationSchema<T> valueDeserializer, Properties props) {
this(Collections.singletonList(topic), valueDeserializer, props);
}
public FlinkKafkaConsumer09(String topic, KeyedDeserializationSchema<T> deserializer, Properties props) {
this(Collections.singletonList(topic), deserializer, props);
}
public FlinkKafkaConsumer09(List<String> topics, DeserializationSchema<T> deserializer, Properties props) {
this(topics, new KeyedDeserializationSchemaWrapper<>(deserializer), props);
}
public FlinkKafkaConsumer09(List<String> topics, KeyedDeserializationSchema<T> deserializer, Properties props) {
super(topics, deserializer);
this.properties = checkNotNull(props, "props");
setDeserializer(this.properties);
// configure the polling timeout
try {
if (properties.containsKey(KEY_POLL_TIMEOUT)) {
this.pollTimeout = Long.parseLong(properties.getProperty(KEY_POLL_TIMEOUT));
} else {
this.pollTimeout = DEFAULT_POLL_TIMEOUT;
}
}
catch (Exception e) {
throw new IllegalArgumentException("Cannot parse poll timeout for '" + KEY_POLL_TIMEOUT + '\'', e);
}
}
@Override
protected AbstractFetcher<T, ?> createFetcher(
SourceContext<T> sourceContext,
List<KafkaTopicPartition> thisSubtaskPartitions,
SerializedValue<AssignerWithPeriodicWatermarks<T>> watermarksPeriodic,
SerializedValue<AssignerWithPunctuatedWatermarks<T>> watermarksPunctuated,
StreamingRuntimeContext runtimeContext) throws Exception {
boolean useMetrics = !Boolean.valueOf(properties.getProperty(KEY_DISABLE_METRICS, "false"));
return new Kafka09Fetcher<>(sourceContext, thisSubtaskPartitions,
watermarksPeriodic, watermarksPunctuated,
runtimeContext, deserializer,
properties, pollTimeout, useMetrics);
}
@Override
protected List<KafkaTopicPartition> getKafkaPartitions(List<String> topics) {
// read the partitions that belong to the listed topics
final List<KafkaTopicPartition> partitions = new ArrayList<>();
int partition=Integer.valueOf(this.properties.get("partitions"));
try (KafkaConsumer<byte[], byte[]> consumer = new KafkaConsumer<>(this.properties)) {
for (final String topic: topics) {
// get partitions for each topic
List<PartitionInfo> partitionsForTopic = consumer.partitionsFor(topic);
// for non existing topics, the list might be null.
if (partitionsForTopic != null) {
partitions.addAll(convertToFlinkKafkaTopicPartition(partitionsForTopic),partition);
}
}
}
if (partitions.isEmpty()) {
throw new RuntimeException("Unable to retrieve any partitions for the requested topics " + topics);
}
// we now have a list of partitions which is the same for all parallel consumer instances.
LOG.info("Got {} partitions from these topics: {}", partitions.size(), topics);
if (LOG.isInfoEnabled()) {
logPartitionInfo(LOG, partitions);
}
return partitions;
}
private static List<KafkaTopicPartition> convertToFlinkKafkaTopicPartition(List<PartitionInfo> partitions,int partition) {
checkNotNull(partitions);
List<KafkaTopicPartition> ret = new ArrayList<>(partitions.size());
//for (PartitionInfo pi : partitions) {
ret.add(new KafkaTopicPartition(partitions.get(partition).topic(), partitions.get(partition).partition()));
// }
return ret;
}
private static void setDeserializer(Properties props) {
final String deSerName = ByteArrayDeserializer.class.getCanonicalName();
Object keyDeSer = props.get(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG);
Object valDeSer = props.get(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG);
if (keyDeSer != null && !keyDeSer.equals(deSerName)) {
LOG.warn("Ignoring configured key DeSerializer ({})", ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG);
}
if (valDeSer != null && !valDeSer.equals(deSerName)) {
LOG.warn("Ignoring configured value DeSerializer ({})", ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG);
}
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, deSerName);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, deSerName);
}
}
，但不显示组件。 paintComponent()无效。
结构如下所示：
revalidate()我认为这是相关的代码。像public class AbstractView extends JPanel implements ViewInterface {
}
public class GraphView extends AbstractView {
public void doSomeStuff(){
this.add(new ElementView());
this.revalidate();
}
}
public class ElementView extends AbstractView {
@Override
public void paintComponent(Graphics g) {
// this method is called but has no effect
super.paintComponent(g);
g.fillRect(0,0,100,100);
this.repaint();
}
}
甚至getPreferredSize()，getX()，getY()，getWidth()这样的方法已经实施，似乎可以像预期的那样工作。我搜索谷歌几个小时，但似乎没有任何帮助。我在正确的位置搜索错误吗？
编辑：
以下是一些代码：
1：
getHeight()2：
public class AbstractView extends JPanel implements ViewInterface {
@Override
public void update() {}
@Override
public boolean containsPoint(Point p) {
return false;
}
@Override
public ApplicationView topContainer() {
return null;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(this.getBounds().getSize());
}
@Override Rectangle getBounds(){
return Rectangle(0,0,0,0);
}
@Override
public int getX() {
return this.getBounds().x;
}
@Override
public int getY() {
return this.getBounds().y;
}
@Override
public int getWidth() {
return this.getBounds().width;
}
@Override
public int getHeight() {
return this.getBounds().height;
}
}
3：
class BodyView extends AbstractView {
Body body;
BodyView(Body b, AbstractView c){
this.body = b;
this.setLayout(null);
}
private int radius(){
return (int) body.radius();
}
@Override
public void paintComponent(Graphics g) {
// called but without effect
super.paintComponent(g);
g.setColor(this.color);
int x = (int) body.position.at(0);
int y = (int) body.position.at(1);
int radius = radius();
g.fillOval(x-radius, y-radius, 2*radius, 2*radius);
}
@Override
public Rectangle getBounds(){
int radius = this.radius();
return new Rectangle(getX() - radius - 2, getY() - radius - 2, 2*radius + 2, 2*radius + 2);
}
@Override
public int getX() {
return (int) body.position.at(0);
}
@Override
public int getY() {
return (int) body.position.at(1);
}
}
如果这还不足以确定问题，我想引用this Github。