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Download.java
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368 lines (323 loc) · 9.21 KB
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package cn.zhxu.okhttps;
import java.io.*;
import java.util.function.Consumer;
/**
* 文件下载
* @author Troy.Zhou
*/
public class Download {
private final File file;
private final InputStream input;
private final TaskExecutor taskExecutor;
private final Ctrl ctrl;
private Consumer<File> onSuccess;
private Consumer<Failure> onFailure;
private Consumer<Status> onComplete;
private long doneBytes;
private int buffSize = 0;
private long seekBytes = 0;
private boolean appended;
private volatile Status status;
private final Object lock = new Object();
protected boolean nextOnIO = false;
private boolean sOnIO;
private boolean fOnIO;
private boolean cOnIO;
public Download(File file, InputStream input, TaskExecutor taskExecutor, long skipBytes) {
this.file = file;
this.input = input;
this.taskExecutor = taskExecutor;
this.seekBytes = skipBytes;
this.ctrl = new Ctrl();
}
/**
* 设置缓冲区大小，默认 2K（2048）
* @param buffSize 缓冲区大小（单位：字节）
* @return Download
*/
public Download setBuffSize(int buffSize) {
if (buffSize > 0) {
this.buffSize = buffSize;
}
return this;
}
/**
* 设置文件追加模式
* 用预断点续传和分块下载
* @return Download
*/
public Download setAppended() {
this.appended = true;
return this;
}
/**
* 设置文件指针，从文件的 seekBytes 位置追加内容
* 只有配合 setAppended() 方法一起才会有作用
* @param seekBytes 跨越的字节数
* @return Download
*/
public Download setFilePointer(long seekBytes) {
this.seekBytes = seekBytes;
return this;
}
/**
* 在IO线程执行
* @return Download
*/
public Download nextOnIO() {
nextOnIO = true;
return this;
}
/**
* 设置下载成功回调
* @param onSuccess 成功回调函数
* @return Download
*/
public Download setOnSuccess(Consumer<File> onSuccess) {
this.onSuccess = onSuccess;
sOnIO = nextOnIO;
nextOnIO = false;
return this;
}
/**
* 设置下载失败回调（取消不执行）
* @param onFailure 失败回调函数
* @return Download
*/
public Download setOnFailure(Consumer<Failure> onFailure) {
this.onFailure = onFailure;
fOnIO = nextOnIO;
nextOnIO = false;
return this;
}
/**
* @since 3.2.0
* 设置下载结束回调（成功、失败、取消都执行）
* @param onComplete 结束回调函数
* @return Download
*/
public Download setOnComplete(Consumer<Status> onComplete) {
this.onComplete = onComplete;
cOnIO = nextOnIO;
nextOnIO = false;
return this;
}
/**
* 开始下载
* @return 下载控制器
*/
public Ctrl start() {
if (buffSize == 0) {
buffSize = Process.DEFAULT_STEP_BYTES;
}
RandomAccessFile raFile = randomAccessFile();
if (raFile != null) {
status = Status.DOWNLOADING;
taskExecutor.execute(() -> doDownload(raFile), true);
}
return ctrl;
}
/**
* 获取下载控制器
* @return Ctrl
*/
public Ctrl getCtrl() {
return ctrl;
}
/**
* 下载状态
* @since v3.2.0
*/
public enum Status {
/**
* 已取消
*/
CANCELED(-1),
/**
* 下载中
*/
DOWNLOADING(1),
/**
* 已暂停
*/
PAUSED(2),
/**
* 成功下载完成
*/
DONE(3),
/**
* 发送错误
*/
ERROR(4);
private final int value;
Status(int value) {
this.value = value;
}
public int value() {
return value;
}
}
/**
* 下载控制器
*/
public class Ctrl {
/**
* @return 下载状态（v3.2.0 之前方法 返回整型常量，v3.2.0 开始修改为枚举）
*/
public Status status() {
return status;
}
/**
* 暂停下载任务（只有处于下载中状态才能暂停成功）
* @return 是否暂停成功
*/
public boolean pause() {
synchronized (lock) {
if (status == Status.DOWNLOADING) {
status = Status.PAUSED;
return true;
}
}
return false;
}
/**
* 继续下载任务（只有处于暂停状态才能恢复成功）
* @return 是否恢复成功
*/
public boolean resume() {
synchronized (lock) {
if (status == Status.PAUSED) {
status = Status.DOWNLOADING;
return true;
}
}
return false;
}
/**
* 取消下载任务（只有处于暂停或下载中状态才能取消成功）
* @return 是否取消成功
*/
public boolean cancel() {
synchronized (lock) {
if (status == Status.PAUSED || status == Status.DOWNLOADING) {
status = Status.CANCELED;
return true;
}
}
return false;
}
}
public class Failure {
private final IOException exception;
Failure(IOException exception) {
this.exception = exception;
}
/**
* @return 下载文件
*/
public File getFile() {
return file;
}
/**
* @return 本次已下载字节数
*/
public long getDoneBytes() {
return doneBytes;
}
/**
* @return 异常信息
*/
public IOException getException() {
return exception;
}
}
private RandomAccessFile randomAccessFile() {
try {
return new RandomAccessFile(file, "rw");
} catch (FileNotFoundException e) {
status = Status.ERROR;
closeQuietly(input);
fireOnComplete();
fireOnFailure(e);
}
return null;
}
private void doDownload(RandomAccessFile raFile) {
try {
if (appended && seekBytes > 0) {
// 使支持并行下载到同一个文件
raFile.seek(seekBytes);
}
while (status != Status.CANCELED && status != Status.DONE) {
if (status == Status.DOWNLOADING) {
byte[] buff = new byte[buffSize];
int len;
while ((len = input.read(buff)) != -1) {
raFile.write(buff, 0, len);
doneBytes += len;
if (status == Status.CANCELED
|| status == Status.PAUSED) {
break;
}
}
if (len == -1) {
synchronized (lock) {
if (status != Status.CANCELED) {
status = Status.DONE;
}
}
}
}
}
} catch (IOException e) {
synchronized (lock) {
if (status != Status.CANCELED) {
status = Status.ERROR;
}
}
if (status == Status.ERROR) {
fireOnFailure(e);
}
} finally {
closeQuietly(raFile);
closeQuietly(input);
if (status == Status.CANCELED && !file.delete()) {
Platform.logError("can not delete canceled file: " + file);
}
fireOnComplete();
}
if (status == Status.DONE) {
fireOnSuccess();
}
}
private void fireOnComplete() {
Consumer<Status> onComplete = this.onComplete;
if (onComplete != null) {
taskExecutor.execute(() -> onComplete.accept(status), cOnIO);
}
}
private void fireOnSuccess() {
Consumer<File> onSuccess = this.onSuccess;
if (onSuccess != null) {
taskExecutor.execute(() -> onSuccess.accept(file), sOnIO);
}
}
private void fireOnFailure(IOException e) {
Consumer<Failure> onFailure = this.onFailure;
if (onFailure != null) {
taskExecutor.execute(() -> onFailure.accept(new Failure(e)), fOnIO);
} else {
throw new OkHttpsException("Download failed: ", e);
}
}
public static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
}