Class StreamUtils
- java.lang.Object
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- org.apache.druid.java.util.common.StreamUtils
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public class StreamUtils extends Object
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Constructor Summary
Constructors Constructor Description StreamUtils()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static long
copyAndClose(InputStream is, OutputStream os)
Copy from `is` to `os` and close the streams regardless of the result.static long
copyToFileAndClose(InputStream is, File file)
Copy from an input stream to a file (and buffer it) and close the input stream.static long
retryCopy(com.google.common.io.ByteSource byteSource, com.google.common.io.ByteSink byteSink, com.google.common.base.Predicate<Throwable> shouldRetry, int maxAttempts)
Retry copy attempts from input stream to output stream.
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Method Detail
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copyToFileAndClose
public static long copyToFileAndClose(InputStream is, File file) throws IOException
Copy from an input stream to a file (and buffer it) and close the input stream.It is highly recommended to use FileUtils.retryCopy whenever possible, and not use a raw `InputStream`
- Parameters:
is
- The input stream to copy bytes from. `is` is closed regardless of the copy result.file
- The file to copy bytes to. Any parent directories are automatically created.- Returns:
- The count of bytes written to the file
- Throws:
IOException
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copyAndClose
public static long copyAndClose(InputStream is, OutputStream os) throws IOException
Copy from `is` to `os` and close the streams regardless of the result.- Parameters:
is
- The `InputStream` to copy results from. It is closedos
- The `OutputStream` to copy results to. It is closed- Returns:
- The count of bytes written to `os`
- Throws:
IOException
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retryCopy
public static long retryCopy(com.google.common.io.ByteSource byteSource, com.google.common.io.ByteSink byteSink, com.google.common.base.Predicate<Throwable> shouldRetry, int maxAttempts)
Retry copy attempts from input stream to output stream. Does *not* check to make sure data was intact during the transfer- Parameters:
byteSource
- Supplier for input streams to copy from. The stream is closed on every retry.byteSink
- Supplier for output streams. The stream is closed on every retry.shouldRetry
- Predicate to determine if the throwable is recoverable for a retrymaxAttempts
- Maximum number of retries before failing
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