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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.shard;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.routing.AllocationId;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.gateway.CorruptStateException;
import org.elasticsearch.gateway.MetaDataStateFormat;
import java.io.IOException;
import java.io.OutputStream;
/**
*/
public final class ShardStateMetaData {
private static final String SHARD_STATE_FILE_PREFIX = "state-";
private static final String PRIMARY_KEY = "primary";
private static final String VERSION_KEY = "version";
private static final String INDEX_UUID_KEY = "index_uuid";
private static final String ALLOCATION_ID_KEY = "allocation_id";
public final long version;
public final String indexUUID;
public final boolean primary;
@Nullable
public final AllocationId allocationId; // can be null if we read from legacy format (see fromXContent and MultiDataPathUpgrader)
public ShardStateMetaData(long version, boolean primary, String indexUUID, AllocationId allocationId) {
assert indexUUID != null;
this.version = version;
this.primary = primary;
this.indexUUID = indexUUID;
this.allocationId = allocationId;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ShardStateMetaData that = (ShardStateMetaData) o;
if (primary != that.primary) {
return false;
}
if (version != that.version) {
return false;
}
if (indexUUID != null ? !indexUUID.equals(that.indexUUID) : that.indexUUID != null) {
return false;
}
if (allocationId != null ? !allocationId.equals(that.allocationId) : that.allocationId != null) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = Long.hashCode(version);
result = 31 * result + (indexUUID != null ? indexUUID.hashCode() : 0);
result = 31 * result + (allocationId != null ? allocationId.hashCode() : 0);
result = 31 * result + (primary ? 1 : 0);
return result;
}
@Override
public String toString() {
return "version [" + version + "], primary [" + primary + "], allocation [" + allocationId + "]";
}
public static final MetaDataStateFormat<ShardStateMetaData> FORMAT = new MetaDataStateFormat<ShardStateMetaData>(XContentType.JSON, SHARD_STATE_FILE_PREFIX) {
@Override
protected XContentBuilder newXContentBuilder(XContentType type, OutputStream stream) throws IOException {
XContentBuilder xContentBuilder = super.newXContentBuilder(type, stream);
xContentBuilder.prettyPrint();
return xContentBuilder;
}
@Override
public void toXContent(XContentBuilder builder, ShardStateMetaData shardStateMetaData) throws IOException {
builder.field(VERSION_KEY, shardStateMetaData.version);
builder.field(PRIMARY_KEY, shardStateMetaData.primary);
builder.field(INDEX_UUID_KEY, shardStateMetaData.indexUUID);
if (shardStateMetaData.allocationId != null) {
builder.field(ALLOCATION_ID_KEY, shardStateMetaData.allocationId);
}
}
@Override
public ShardStateMetaData fromXContent(XContentParser parser) throws IOException {
XContentParser.Token token = parser.nextToken();
if (token == null) {
return null;
}
long version = -1;
Boolean primary = null;
String currentFieldName = null;
String indexUUID = IndexMetaData.INDEX_UUID_NA_VALUE;
AllocationId allocationId = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if (VERSION_KEY.equals(currentFieldName)) {
version = parser.longValue();
} else if (PRIMARY_KEY.equals(currentFieldName)) {
primary = parser.booleanValue();
} else if (INDEX_UUID_KEY.equals(currentFieldName)) {
indexUUID = parser.text();
} else {
throw new CorruptStateException("unexpected field in shard state [" + currentFieldName + "]");
}
} else if (token == XContentParser.Token.START_OBJECT) {
if (ALLOCATION_ID_KEY.equals(currentFieldName)) {
allocationId = AllocationId.fromXContent(parser);
} else {
throw new CorruptStateException("unexpected object in shard state [" + currentFieldName + "]");
}
} else {
throw new CorruptStateException("unexpected token in shard state [" + token.name() + "]");
}
}
if (primary == null) {
throw new CorruptStateException("missing value for [primary] in shard state");
}
if (version == -1) {
throw new CorruptStateException("missing value for [version] in shard state");
}
return new ShardStateMetaData(version, primary, indexUUID, allocationId);
}
};
}
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