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add Unsynchronized version of UnsynchronizedBufferedInputStream and U…
…nsynchronizedBufferedInputStream, and performance tests.
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src/main/java/org/apache/commons/io/input/buffer/UnsynchronizedBufferedInputStream.java
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| /* | ||
| * 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.commons.io.input.buffer; | ||
|
|
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import org.apache.commons.io.IOUtils; | ||
| import static org.apache.commons.io.IOUtils.EOF; | ||
|
|
||
| /** | ||
| * A BufferedReader class who does not care about thread safety, but very much faster. | ||
| * | ||
| * Should be able to replace java.io.BufferedReader in nearly every use-cases when you | ||
| * need the Reader be buffered, but do not need it have thread safety. | ||
| */ | ||
| public class UnsynchronizedBufferedInputStream extends InputStream { | ||
| private final InputStream inputStream; | ||
| private final byte[] byteBuffer; | ||
|
|
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| private int nowIndex = 0; | ||
| private int nowLimit = 0; | ||
|
|
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| /** | ||
| * Creates a new instance, which filters the given input stream, and | ||
| * uses the given buffer size. | ||
| * | ||
| * @param inputStream The original input stream, which is being buffered. | ||
| * @param charBufferSize size of the buffer. | ||
| */ | ||
| public UnsynchronizedBufferedInputStream(InputStream inputStream, int charBufferSize) { | ||
| this(inputStream, new byte[charBufferSize]); | ||
| } | ||
|
|
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| /** | ||
| * Creates a new instance, which filters the given input stream, and | ||
| * uses IOUtils.DEFAULT_BUFFER_SIZE. | ||
| * | ||
| * @param inputStream The original input stream, which is being buffered. | ||
| * @see IOUtils#DEFAULT_BUFFER_SIZE | ||
| */ | ||
| public UnsynchronizedBufferedInputStream(InputStream inputStream) { | ||
| this(inputStream, IOUtils.DEFAULT_BUFFER_SIZE); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new instance, which filters the given reader, and | ||
| * uses the given buffer. | ||
| * | ||
| * @param inputStream The original inputStream, which is being buffered. | ||
| * @param byteBuffer buffer used. | ||
| */ | ||
| public UnsynchronizedBufferedInputStream(InputStream inputStream, byte[] byteBuffer) { | ||
| this.inputStream = inputStream; | ||
| this.byteBuffer = byteBuffer; | ||
| } | ||
|
|
||
| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| public int read(byte[] cbuf, int off, int len) throws IOException { | ||
| if (len <= 0) { | ||
| return 0; | ||
| } | ||
| int currentBufferSize = this.nowLimit - this.nowIndex; | ||
| if (currentBufferSize == 0) { | ||
| int readLength; | ||
| do { | ||
| readLength = this.inputStream.read(this.byteBuffer, 0, this.byteBuffer.length); | ||
| } while (readLength == 0); | ||
| if (readLength == EOF) { | ||
| return EOF; | ||
| } | ||
| this.nowLimit = readLength; | ||
| this.nowIndex = 0; | ||
| currentBufferSize = this.nowLimit - this.nowIndex; | ||
| } | ||
| if (currentBufferSize <= len) { | ||
| System.arraycopy(this.byteBuffer, this.nowIndex, cbuf, off, currentBufferSize); | ||
| this.nowLimit = this.nowIndex = 0; | ||
| return currentBufferSize; | ||
| } else { | ||
| System.arraycopy(this.byteBuffer, this.nowIndex, cbuf, off, len); | ||
| this.nowIndex += len; | ||
| return len; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| public int read() throws IOException { | ||
| int res = this.peek(); | ||
| if (res != EOF) { | ||
| eat(); | ||
| } | ||
| return res; | ||
| } | ||
|
|
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| /** | ||
| * see the next byte, but not mark it as read. | ||
| * | ||
| * @return the next byte | ||
| * @throws IOException by inputStream.read() | ||
| * @see #read() | ||
| */ | ||
| public int peek() throws IOException { | ||
| int currentBufferSize = this.nowLimit - this.nowIndex; | ||
| if (currentBufferSize == 0) { | ||
| int readLength; | ||
| do { | ||
| readLength = this.inputStream.read(this.byteBuffer, 0, this.byteBuffer.length); | ||
| } while (readLength == 0); | ||
| if (readLength == EOF) { | ||
| return EOF; | ||
| } | ||
| this.nowLimit = readLength; | ||
| this.nowIndex = 0; | ||
| return this.byteBuffer[0]; | ||
| } | ||
| return this.byteBuffer[this.nowIndex]; | ||
| } | ||
|
|
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| /** | ||
| * mark the current char as read. | ||
| * must be used after invoke peek. | ||
| * | ||
| * @see #read() | ||
| * @see #peek() | ||
| */ | ||
| public void eat() { | ||
| this.nowIndex++; | ||
| } | ||
|
|
||
| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| public void close() throws IOException { | ||
| if (this.inputStream != null) { | ||
| this.inputStream.close(); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * getter for this.inputStream | ||
| * @return this.inputStream | ||
| */ | ||
| public InputStream getInputStream() { | ||
| return this.inputStream; | ||
| } | ||
|
|
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| /** | ||
| * getter for this.byteBuffer | ||
| * @return this.byteBuffer | ||
| */ | ||
| public byte[] getByteBuffer() { | ||
| return this.byteBuffer; | ||
| } | ||
|
|
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| /** | ||
| * getter for this.nowIndex | ||
| * @return this.nowIndex | ||
| */ | ||
| public int getNowIndex() { | ||
| return this.nowIndex; | ||
| } | ||
|
|
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| /** | ||
| * setter for this.nowIndex | ||
| * @param nowIndex this.nowIndex | ||
| */ | ||
| public void setNowIndex(int nowIndex) { | ||
| this.nowIndex = nowIndex; | ||
| } | ||
|
|
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| /** | ||
| * getter for this.nowLimit | ||
| * @return this.nowLimit | ||
| */ | ||
| public int getNowLimit() { | ||
| return this.nowLimit; | ||
| } | ||
|
|
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| /** | ||
| * setter for this.nowLimit | ||
| * @param nowLimit this.nowLimit | ||
| */ | ||
| public void setNowLimit(int nowLimit) { | ||
| this.nowLimit = nowLimit; | ||
| } | ||
| } |
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