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Annotation.java
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Annotation.java
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/**
* Copyright 2015-2016 The OpenZipkin Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package zipkin;
import zipkin.internal.Nullable;
import static zipkin.internal.Util.checkNotNull;
import static zipkin.internal.Util.equal;
/**
* Associates an event that explains latency with a timestamp.
*
* <p>Unlike log statements, annotations are often codes: Ex. {@link Constants#SERVER_RECV "sr"}.
*/
public final class Annotation implements Comparable<Annotation> {
public static Annotation create(long timestamp, String value, @Nullable Endpoint endpoint) {
return new Annotation(timestamp, value, endpoint);
}
/**
* Microseconds from epoch.
*
* <p>This value should be set directly by instrumentation, using the most precise value possible.
* For example, {@code gettimeofday} or multiplying {@link System#currentTimeMillis} by 1000.
*/
public final long timestamp;
/**
* Usually a short tag indicating an event, like {@link Constants#SERVER_RECV "sr"}. or {@link
* Constants#ERROR "error"}
*/
public final String value;
/** The host that recorded {@link #value}, primarily for query by service name. */
@Nullable
public final Endpoint endpoint;
Annotation(long timestamp, String value, Endpoint endpoint) {
this.timestamp = timestamp;
this.value = checkNotNull(value, "value");
this.endpoint = endpoint;
}
public Builder toBuilder(){
return new Builder(this);
}
public static Builder builder(){
return new Builder();
}
public static final class Builder {
private Long timestamp;
private String value;
private Endpoint endpoint;
Builder() {
}
Builder(Annotation source) {
this.timestamp = source.timestamp;
this.value = source.value;
this.endpoint = source.endpoint;
}
/** @see Annotation#timestamp */
public Builder timestamp(long timestamp) {
this.timestamp = timestamp;
return this;
}
/** @see Annotation#value */
public Builder value(String value) {
this.value = value;
return this;
}
/** @see Annotation#endpoint */
public Builder endpoint(Endpoint endpoint) {
this.endpoint = endpoint;
return this;
}
public Annotation build() {
return Annotation.create(timestamp, value, endpoint);
}
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (o instanceof Annotation) {
Annotation that = (Annotation) o;
return (this.timestamp == that.timestamp)
&& (this.value.equals(that.value))
&& equal(this.endpoint, that.endpoint);
}
return false;
}
@Override
public int hashCode() {
int h = 1;
h *= 1000003;
h ^= (timestamp >>> 32) ^ timestamp;
h *= 1000003;
h ^= value.hashCode();
h *= 1000003;
h ^= (endpoint == null) ? 0 : endpoint.hashCode();
return h;
}
/** Compares by {@link #timestamp}, then {@link #value}. */
@Override
public int compareTo(Annotation that) {
if (this == that) return 0;
int byTimestamp = timestamp < that.timestamp ? -1 : timestamp == that.timestamp ? 0 : 1;
if (byTimestamp != 0) return byTimestamp;
return value.compareTo(that.value);
}
}