pl.allegro.tech.hermes.common.message.wrapper.MessageMetadata Maven / Gradle / Ivy

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Fast and reliable message broker built on top of Kafka.

There is a newer version: 2.7.0

package pl.allegro.tech.hermes.common.message.wrapper;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableMap;

import java.util.Map;
import java.util.Objects;

import static java.util.Optional.ofNullable;

@JsonIgnoreProperties(ignoreUnknown = true)
public class MessageMetadata {

    private final long timestamp;
    private final String id;
    private final Map externalMetadata;

    @JsonCreator
    public MessageMetadata(@JsonProperty("timestamp") long timestamp,
                           @JsonProperty("id") String id,
                           @JsonProperty("externalMetadata") Map externalMetadata) {
        this.id = id;
        this.timestamp = timestamp;
        this.externalMetadata = ofNullable(externalMetadata).orElseGet(ImmutableMap::of);
    }

    public MessageMetadata(long timestamp, Map externalMetadata) {
        this(timestamp, "", externalMetadata);
    }

    public String getId() {
        return id;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public Map getExternalMetadata() {
        return ImmutableMap.copyOf(externalMetadata);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id, timestamp);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        final MessageMetadata other = (MessageMetadata) obj;
        return Objects.equals(this.id, other.id)
                && Objects.equals(this.timestamp, other.timestamp);
    }
}