com.google.gerrit.server.Sequence Maven / Gradle / Ivy
// Copyright (C) 2023 The Android Open Source Project
//
// 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 com.google.gerrit.server;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import com.google.common.collect.ImmutableList;
import com.google.inject.BindingAnnotation;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
/**
* An incrementing sequence that's used to assign new unique numbers for change, account and group
* IDs.
*/
public interface Sequence {
String NAME_ACCOUNTS = "accounts";
String NAME_GROUPS = "groups";
String NAME_CHANGES = "changes";
/**
* Some callers cannot get the normal {@link #NAME_ACCOUNTS} sequence injected because some
* injected fields are not available at injection time. Allow for providing a light-weight
* injected instance.
*/
@BindingAnnotation
@Target({FIELD, PARAMETER, METHOD})
@Retention(RUNTIME)
@interface LightweightAccounts {}
/**
* Some callers cannot get the normal {@link #NAME_GROUPS} sequence injected because some injected
* fields are not available at injection time. Allow for providing a light-weight injected
* instance.
*/
@BindingAnnotation
@Target({FIELD, PARAMETER, METHOD})
@Retention(RUNTIME)
@interface LightweightGroups {}
enum SequenceType {
ACCOUNTS,
CHANGES,
GROUPS;
}
/** Returns the next available sequence value and increments the sequence for the next call. */
int next();
/** Similar to {@link #next()} but returns a {@code count} of next available values. */
ImmutableList next(int count);
/** Returns the next available sequence value. */
int current();
/** Returns the last sequence number that was assigned. */
int last();
/**
* Stores a new {@code value} to be returned on the next calls for {@link #next()} or {@link
* #current()}.
*/
void storeNew(int value);
}