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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onosproject.store.service;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.base.MoreObjects;
/**
* Database update operation.
*
*/
public final class DatabaseUpdate {
/**
* Type of database update operation.
*/
public enum Type {
/**
* Insert/Update entry without any checks.
*/
PUT,
/**
* Insert an entry iff there is no existing entry for that key.
*/
PUT_IF_ABSENT,
/**
* Update entry if the current version matches specified version.
*/
PUT_IF_VERSION_MATCH,
/**
* Update entry if the current value matches specified value.
*/
PUT_IF_VALUE_MATCH,
/**
* Remove entry without any checks.
*/
REMOVE,
/**
* Remove entry if the current version matches specified version.
*/
REMOVE_IF_VERSION_MATCH,
/**
* Remove entry if the current value matches specified value.
*/
REMOVE_IF_VALUE_MATCH,
}
private Type type;
private String mapName;
private String key;
private byte[] value;
private byte[] currentValue;
private long currentVersion = -1;
/**
* Returns the type of update operation.
* @return type of update.
*/
public Type type() {
return type;
}
/**
* Returns the name of map being updated.
* @return map name.
*/
public String mapName() {
return mapName;
}
/**
* Returns the item key being updated.
* @return item key
*/
public String key() {
return key;
}
/**
* Returns the new value.
* @return item's target value.
*/
public byte[] value() {
return value;
}
/**
* Returns the expected current value in the database value for the key.
* @return current value in database.
*/
public byte[] currentValue() {
return currentValue;
}
/**
* Returns the expected current version in the database for the key.
* @return expected version.
*/
public long currentVersion() {
return currentVersion;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("type", type)
.add("mapName", mapName)
.add("key", key)
.add("value", value)
.add("currentValue", currentValue)
.add("currentVersion", currentVersion)
.toString();
}
/**
* Creates a new builder instance.
*
* @return builder.
*/
public static Builder newBuilder() {
return new Builder();
}
/**
* DatabaseUpdate builder.
*
*/
public static final class Builder {
private DatabaseUpdate update = new DatabaseUpdate();
public DatabaseUpdate build() {
validateInputs();
return update;
}
public Builder withType(Type type) {
update.type = checkNotNull(type, "type cannot be null");
return this;
}
public Builder withMapName(String mapName) {
update.mapName = checkNotNull(mapName, "mapName cannot be null");
return this;
}
public Builder withKey(String key) {
update.key = checkNotNull(key, "key cannot be null");
return this;
}
public Builder withCurrentValue(byte[] value) {
update.currentValue = checkNotNull(value, "currentValue cannot be null");
return this;
}
public Builder withValue(byte[] value) {
update.value = checkNotNull(value, "value cannot be null");
return this;
}
public Builder withCurrentVersion(long version) {
checkArgument(version >= 0, "version cannot be negative");
update.currentVersion = version;
return this;
}
private void validateInputs() {
checkNotNull(update.type, "type must be specified");
checkNotNull(update.mapName, "map name must be specified");
checkNotNull(update.key, "key must be specified");
switch (update.type) {
case PUT:
case PUT_IF_ABSENT:
checkNotNull(update.value, "value must be specified.");
break;
case PUT_IF_VERSION_MATCH:
checkNotNull(update.value, "value must be specified.");
checkState(update.currentVersion >= 0, "current version must be specified");
break;
case PUT_IF_VALUE_MATCH:
checkNotNull(update.value, "value must be specified.");
checkNotNull(update.currentValue, "currentValue must be specified.");
break;
case REMOVE:
break;
case REMOVE_IF_VERSION_MATCH:
checkState(update.currentVersion >= 0, "current version must be specified");
break;
case REMOVE_IF_VALUE_MATCH:
checkNotNull(update.currentValue, "currentValue must be specified.");
break;
default:
throw new IllegalStateException("Unknown operation type");
}
}
}
}
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