spring-data-redis ReadOffset 源码
spring-data-redis ReadOffset 代码
文件路径：/src/main/java/org/springframework/data/redis/connection/stream/ReadOffset.java
/*
* Copyright 2018-2022 the original author or 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
*
* https://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 org.springframework.data.redis.connection.stream;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* Value object representing read offset for a Stream.
*/
public final class ReadOffset {
private final String offset;
private ReadOffset(String offset) {
this.offset = offset;
}
/**
* Read from the latest offset.
*
* @return
*/
public static ReadOffset latest() {
return new ReadOffset("$");
}
/**
* Read all new arriving elements with ids greater than the last one consumed by the consumer group.
*
* @return the {@link ReadOffset} object without a specific offset.
*/
public static ReadOffset lastConsumed() {
return new ReadOffset(">");
}
/**
* Read all arriving elements from the stream starting at {@code offset}.
*
* @param offset the stream offset.
* @return the {@link ReadOffset} starting at {@code offset}.
*/
public static ReadOffset from(String offset) {
Assert.hasText(offset, "Offset must not be empty");
return new ReadOffset(offset);
}
/**
* Read all arriving elements from the stream starting at {@link RecordId}. Using a
* {@link RecordId#shouldBeAutoGenerated() auto-generated} {@link RecordId} returns the {@link #latest()} read offset.
*
* @param offset the stream offset.
* @return the {@link ReadOffset} starting at {@link RecordId}.
*/
public static ReadOffset from(RecordId offset) {
if (offset.shouldBeAutoGenerated()) {
return latest();
}
return from(offset.getValue());
}
public String getOffset() {
return this.offset;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
ReadOffset that = (ReadOffset) o;
return ObjectUtils.nullSafeEquals(offset, that.offset);
}
@Override
public int hashCode() {
return ObjectUtils.nullSafeHashCode(offset);
}
public String toString() {
return "ReadOffset(offset=" + this.getOffset() + ")";
}
}
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