| /* |
| * Copyright 2017 HugeGraph Authors |
| * |
| * 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 com.baidu.hugegraph.computer.core.combiner; |
| |
| import java.util.function.Supplier; |
| |
| import com.baidu.hugegraph.computer.core.common.Constants; |
| import com.baidu.hugegraph.computer.core.common.exception.ComputerException; |
| import com.baidu.hugegraph.computer.core.io.BytesOutput; |
| import com.baidu.hugegraph.computer.core.io.IOFactory; |
| import com.baidu.hugegraph.computer.core.io.RandomAccessInput; |
| import com.baidu.hugegraph.computer.core.io.Readable; |
| import com.baidu.hugegraph.computer.core.io.Writable; |
| import com.baidu.hugegraph.computer.core.store.entry.InlinePointer; |
| import com.baidu.hugegraph.computer.core.store.entry.Pointer; |
| |
| public abstract class AbstractPointerCombiner<T extends Readable & Writable> |
| implements PointerCombiner { |
| |
| protected T v1; |
| protected T v2; |
| protected T result; |
| protected Combiner<T> combiner; |
| protected BytesOutput output; |
| |
| public AbstractPointerCombiner(Supplier<T> supplier, Combiner<T> combiner) { |
| this.v1 = supplier.get(); |
| this.v2 = supplier.get(); |
| this.result = supplier.get(); |
| this.combiner = combiner; |
| this.output = IOFactory.createBytesOutput(Constants.SMALL_BUF_SIZE); |
| } |
| |
| public Pointer combine(Pointer v1, Pointer v2) { |
| try { |
| RandomAccessInput input1 = v1.input(); |
| RandomAccessInput input2 = v2.input(); |
| input1.seek(v1.offset()); |
| input2.seek(v2.offset()); |
| |
| this.v1.read(input1); |
| this.v2.read(input2); |
| this.combiner.combine(this.v1, this.v2, this.result); |
| |
| this.output.seek(0L); |
| this.result.write(this.output); |
| return new InlinePointer(this.output.buffer(), |
| this.output.position()); |
| } catch (Exception e) { |
| throw new ComputerException( |
| "Failed to combine pointer1(offset=%s, length=%s) and " + |
| "pointer2(offset=%s, length=%s)'", |
| e, v1.offset(), v1.length(), v2.offset(), v2.length()); |
| } |
| } |
| } |