Java tutorial
/* * 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.bookkeeper.api.kv.impl.options; import static io.netty.util.ReferenceCountUtil.release; import static io.netty.util.ReferenceCountUtil.retain; import io.netty.util.Recycler; import io.netty.util.Recycler.Handle; import lombok.AccessLevel; import lombok.Getter; import lombok.Setter; import lombok.experimental.Accessors; import org.apache.bookkeeper.api.kv.options.RangeOption; import org.apache.bookkeeper.api.kv.options.RangeOptionBuilder; /** * The default implementation of range option builder. */ @Accessors(fluent = true) @Setter @Getter(AccessLevel.PACKAGE) class RangeOptionBuilderImpl<K> implements RangeOptionBuilder<K> { static <K> RangeOptionBuilderImpl<K> create(Recycler<RangeOptionBuilderImpl<K>> buildRecyler) { return buildRecyler.get(); } private final Handle<RangeOptionBuilderImpl<K>> handle; private final Recycler<RangeOptionImpl<K>> optionRecycler; private long limit = -1L; private long minModRev = Long.MIN_VALUE; private long maxModRev = Long.MAX_VALUE; private long minCreateRev = Long.MIN_VALUE; private long maxCreateRev = Long.MAX_VALUE; private boolean keysOnly; private boolean countOnly; private K endKey; RangeOptionBuilderImpl(Handle<RangeOptionBuilderImpl<K>> handle, Recycler<RangeOptionImpl<K>> optionRecycler) { this.handle = handle; this.optionRecycler = optionRecycler; } @Override public RangeOptionBuilderImpl<K> endKey(K endKey) { // release previous key release(this.endKey); this.endKey = retain(endKey); return this; } @Override public RangeOption<K> build() { try { RangeOptionImpl<K> option = RangeOptionImpl.create(this.optionRecycler); option.set(this); return option; } finally { recycle(); } } private void recycle() { this.limit = -1L; this.minCreateRev = Long.MIN_VALUE; this.minModRev = Long.MIN_VALUE; this.maxCreateRev = Long.MAX_VALUE; this.maxModRev = Long.MAX_VALUE; this.keysOnly = false; this.countOnly = false; release(endKey); this.endKey = null; handle.recycle(this); } }