org.apache.hudi.common.model.ConsistentHashingNode Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hudi.common.model;
import org.apache.hudi.common.util.JsonUtils;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import java.io.IOException;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Used in consistent hashing index, representing nodes in the consistent hash ring.
* Record the end hash range value and its corresponding file group id.
*/
@JsonIgnoreProperties(ignoreUnknown = true)
public class ConsistentHashingNode implements Serializable {
private final int value;
private final String fileIdPrefix;
@JsonCreator
public ConsistentHashingNode(@JsonProperty("value") int value, @JsonProperty("fileIdPrefix") String fileIdPrefix) {
this.value = value;
this.fileIdPrefix = fileIdPrefix;
}
public static String toJsonString(List nodes) throws IOException {
return JsonUtils.getObjectMapper().writerWithDefaultPrettyPrinter().writeValueAsString(nodes);
}
public static List fromJsonString(String json) throws Exception {
if (json == null || json.isEmpty()) {
return Collections.emptyList();
}
ConsistentHashingNode[] nodes = JsonUtils.getObjectMapper().readValue(json, ConsistentHashingNode[].class);
return Arrays.asList(nodes);
}
public int getValue() {
return value;
}
public String getFileIdPrefix() {
return fileIdPrefix;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("ConsistentHashingNode{");
sb.append("value=").append(value);
sb.append(", fileIdPfx='").append(fileIdPrefix).append('\'');
sb.append('}');
return sb.toString();
}
}