| /* |
| * 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.ignite.internal.metastorage.client; |
| |
| import java.util.Collection; |
| import org.apache.ignite.internal.metastorage.common.ConditionType; |
| |
| /** |
| * Represents a condition for meta storage conditional update. |
| * |
| * @see MetaStorageService#invoke(Condition, Operation, Operation) |
| * @see MetaStorageService#invoke(Condition, Collection, Collection) |
| */ |
| public final class Condition { |
| /** Actual condition implementation. */ |
| private final InnerCondition cond; |
| |
| /** |
| * Constructs a condition which wraps the actual condition implementation. |
| * |
| * @param cond The actual condition implementation. |
| */ |
| Condition(InnerCondition cond) { |
| this.cond = cond; |
| } |
| |
| public InnerCondition inner() { |
| return cond; |
| } |
| |
| public ConditionType type() { |
| return cond.type(); |
| } |
| |
| /** |
| * Represents condition on entry revision. Only one type of condition could be applied to |
| * the one instance of condition. Subsequent invocations of any method which produces condition will throw |
| * {@link IllegalStateException}. |
| */ |
| public static final class RevisionCondition extends AbstractCondition { |
| /** The revision as the condition argument. */ |
| private long rev; |
| |
| /** |
| * Constructs a condition by a revision for an entry identified by the given key. |
| * |
| * @param key Identifies an entry which condition will be applied to. |
| */ |
| RevisionCondition(byte[] key) { |
| super(key); |
| } |
| |
| public long revision() { |
| return rev; |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#REV_EQUAL}. This condition tests the given revision on equality with |
| * target entry revision. |
| * |
| * @param rev The revision. |
| * @return The condition of type {@link ConditionType#REV_EQUAL}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition eq(long rev) { |
| validate(type()); |
| |
| type(ConditionType.REV_EQUAL); |
| |
| this.rev = rev; |
| |
| return new Condition(this); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#REV_NOT_EQUAL}. This condition tests the given revision on inequality |
| * with target entry revision. |
| * |
| * @param rev The revision. |
| * @return The condition of type {@link ConditionType#REV_NOT_EQUAL}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition ne(long rev) { |
| validate(type()); |
| |
| type(ConditionType.REV_NOT_EQUAL); |
| |
| this.rev = rev; |
| |
| return new Condition(this); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#REV_GREATER}. This condition tests that the target entry revision |
| * is greater than given revision. |
| * |
| * @param rev The revision. |
| * @return The condition of type {@link ConditionType#REV_GREATER}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition gt(long rev) { |
| validate(type()); |
| |
| type(ConditionType.REV_GREATER); |
| |
| this.rev = rev; |
| |
| return new Condition(this); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#REV_GREATER_OR_EQUAL}. This condition tests that the target entry |
| * revision is greater than or equal to given revision. |
| * |
| * @param rev The revision. |
| * @return The condition of type {@link ConditionType#REV_GREATER_OR_EQUAL}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition ge(long rev) { |
| validate(type()); |
| |
| type(ConditionType.REV_GREATER_OR_EQUAL); |
| |
| this.rev = rev; |
| |
| return new Condition(this); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#REV_LESS}. This condition tests that target entry revision |
| * is less than the given revision. |
| * |
| * @param rev The revision. |
| * @return The condition of type {@link ConditionType#REV_LESS}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition lt(long rev) { |
| validate(type()); |
| |
| type(ConditionType.REV_LESS); |
| this.rev = rev; |
| |
| return new Condition(this); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#REV_LESS_OR_EQUAL}. This condition tests that target entry revision |
| * is less than or equal to the given revision. |
| * |
| * @param rev The revision. |
| * @return The condition of type {@link ConditionType#REV_LESS_OR_EQUAL}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition le(long rev) { |
| validate(type()); |
| |
| type(ConditionType.REV_LESS_OR_EQUAL); |
| |
| this.rev = rev; |
| |
| return new Condition(this); |
| } |
| } |
| |
| /** |
| * Represents condition on entry value. Only one type of condition could be applied to |
| * the one instance of condition. Subsequent invocations of any method which produces condition will throw |
| * {@link IllegalStateException}. |
| */ |
| public static final class ValueCondition extends AbstractCondition { |
| /** The value as the condition argument. */ |
| private byte[] val; |
| |
| /** |
| * Constructs a condition by a value for an entry identified by the given key. |
| * |
| * @param key Identifies an entry which condition will be applied to. |
| */ |
| ValueCondition(byte[] key) { |
| super(key); |
| } |
| |
| public byte[] value() { |
| return val; |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#VAL_EQUAL}. This condition tests the given value on equality with |
| * target entry value. |
| * |
| * @param val The value. |
| * @return The condition of type {@link ConditionType#VAL_EQUAL}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition eq(byte[] val) { |
| validate(type()); |
| |
| type(ConditionType.VAL_EQUAL); |
| |
| this.val = val; |
| |
| return new Condition(this); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#VAL_NOT_EQUAL}. This condition tests the given value on inequality |
| * with target entry value. |
| * |
| * @param val The value. |
| * @return The condition of type {@link ConditionType#VAL_NOT_EQUAL}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition ne(byte[] val) { |
| validate(type()); |
| |
| type(ConditionType.VAL_NOT_EQUAL); |
| |
| this.val = val; |
| |
| return new Condition(this); |
| } |
| } |
| |
| /** |
| * Represents condition on an entry existence. Only one type of condition could be applied to |
| * the one instance of condition. Subsequent invocations of any method which produces condition will throw |
| * {@link IllegalStateException}. |
| */ |
| public static final class ExistenceCondition extends AbstractCondition { |
| /** |
| * Constructs a condition on existence an entry identified by the given key. |
| * |
| * @param key Identifies an entry which condition will be applied to. |
| */ |
| ExistenceCondition(byte[] key) { |
| super(key); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#KEY_EXISTS}. This condition tests the existence of an entry |
| * identified by the given key. |
| * |
| * @return The condition of type {@link ConditionType#KEY_EXISTS}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition exists() { |
| validate(type()); |
| |
| type(ConditionType.KEY_EXISTS); |
| |
| return new Condition(this); |
| } |
| |
| /** |
| * Produces the condition of type {@link ConditionType#KEY_NOT_EXISTS}. This condition tests the non-existence of an entry |
| * identified by the given key. |
| * |
| * @return The condition of type {@link ConditionType#KEY_NOT_EXISTS}. |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| public Condition notExists() { |
| validate(type()); |
| |
| type(ConditionType.KEY_NOT_EXISTS); |
| |
| return new Condition(this); |
| } |
| } |
| |
| /** |
| * Checks that condition is not defined yet. If the condition is already defined then exception will be thrown. |
| * |
| * @throws IllegalStateException In case when the condition is already defined. |
| */ |
| private static void validate(Enum<?> type) { |
| if (type != null) |
| throw new IllegalStateException("Condition type " + type.name() + " is already defined."); |
| } |
| |
| /** |
| * Defines condition interface. |
| */ |
| private interface InnerCondition { |
| /** |
| * Returns key which identifies an entry which condition will be applied to. |
| * |
| * @return Key which identifies an entry which condition will be applied to. |
| */ |
| byte[] key(); |
| |
| ConditionType type(); |
| } |
| |
| /** |
| * Defines an abstract condition with the key which identifies an entry which condition will be applied to. |
| */ |
| private abstract static class AbstractCondition implements InnerCondition { |
| /** Entry key. */ |
| private final byte[] key; |
| |
| /** |
| * Condition type. |
| */ |
| private ConditionType type; |
| |
| /** |
| * Constructs a condition with the given entry key. |
| * |
| * @param key Key which identifies an entry which condition will be applied to. |
| */ |
| private AbstractCondition(byte[] key) { |
| this.key = key; |
| } |
| |
| /** |
| * Returns the key which identifies an entry which condition will be applied to. |
| * |
| * @return Key which identifies an entry which condition will be applied to. |
| */ |
| @Override public byte[] key() { |
| return key; |
| } |
| |
| @Override public ConditionType type() { |
| return type; |
| } |
| |
| protected void type(ConditionType type) { |
| this.type = type; |
| } |
| } |
| } |