文件队列 QueueFile.java

  次阅读 来源:互联网(转载协议) 2016-01-13 22:00 我要评论(0)

QueueFile.java

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/**

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* Copyright (C) 2010 Square, Inc.

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*

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* Licensed under the Apache License, Version 2.0 (the "License");

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* you may not use this file except in compliance with the License.

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* You may obtain a copy of the License at

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*

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* http://www.apache.org/licenses/LICENSE-2.0

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*

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* Unless required by applicable law or agreed to in writing, software

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* distributed under the License is distributed on an "AS IS" BASIS,

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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

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* See the License for the specific language governing permissions and

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* limitations under the License.

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*/

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package com.squareup.util;

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import com.squareup.Square;

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import java.io.File;

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import java.io.FileNotFoundException;

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import java.io.IOException;

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import java.io.InputStream;

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import java.io.RandomAccessFile;

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import java.nio.channels.FileChannel;

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import java.util.NoSuchElementException;

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/**

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* A reliable, efficient, file-based, FIFO queue. Additions and removals are

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* O(1). All operations are atomic. Writes are synchronous; data will be

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* written to disk before an operation returns. The underlying file is

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* structured to survive process and even system crashes. If an I/O exception

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* is thrown during a mutating change, the change is aborted. It is safe to

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