Apache/jclouds
1
0
Fork 0
mirror of https://github.com/apache/jclouds.git synced 2025-03-01 05:49:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Add ByteSourcePayloadIterator to BasePayloadSlicer

Browse Source 
ByteSourcePayloadIterator avoids buffering the entire slice like
InputStreamPayloadIterator does.  Also rename PayloadIterator to
better reflect its intent and reduce its visibility.
This commit is contained in:
Andrew Gaul 2014-09-01 18:42:47 -07:00
parent 2c32cfee3b
commit e183d9e651
2 changed files with 117 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

94
core/src/main/java/org/jclouds/io/internal/BasePayloadSlicer.java
View File

@ -19,10 +19,7 @@ package org.jclouds.io.internal;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
@ -36,6 +33,7 @@ import org.jclouds.io.Payload;
import org.jclouds.io.Payloads;
import org.jclouds.io.PayloadSlicer;
import org.jclouds.io.payloads.BaseMutableContentMetadata;
import org.jclouds.io.payloads.ByteSourcePayload;
import com.google.common.base.Charsets;
import com.google.common.base.Throwables;
@ -47,16 +45,16 @@ import com.google.common.io.Files;
@Singleton
public class BasePayloadSlicer implements PayloadSlicer {
public static class PayloadIterator implements Iterable<Payload>, Iterator<Payload> {
private static class InputStreamPayloadIterator implements Iterable<Payload>, Iterator<Payload> {
private final InputStream input;
private final ContentMetadata metaData;
private Payload nextPayload;
private final int readLen;
public PayloadIterator(InputStream input, ContentMetadata meta) {
InputStreamPayloadIterator(InputStream input, ContentMetadata metaData) {
this.input = checkNotNull(input, "input");
this.metaData = checkNotNull(meta, "meta");
this.metaData = checkNotNull(metaData, "metaData");
this.readLen = checkNotNull(this.metaData.getContentLength(), "content-length").intValue();
this.nextPayload = getNextPayload();
@ -82,7 +80,7 @@ public class BasePayloadSlicer implements PayloadSlicer {
@Override
public void remove() {
throw new UnsupportedOperationException();
throw new UnsupportedOperationException("Payload iterator does not support removal");
}
@Override
@ -127,6 +125,71 @@ public class BasePayloadSlicer implements PayloadSlicer {
}
private static class ByteSourcePayloadIterator implements Iterable<Payload>, Iterator<Payload> {
private final ByteSource input;
private final ContentMetadata metaData;
private Payload nextPayload;
private long offset = 0;
private final long readLen;
ByteSourcePayloadIterator(ByteSource input, ContentMetadata metaData) {
this.input = checkNotNull(input, "input");
this.metaData = checkNotNull(metaData, "metaData");
this.readLen = checkNotNull(this.metaData.getContentLength(), "content-length").longValue();
this.nextPayload = getNextPayload();
}
@Override
public boolean hasNext() {
return nextPayload != null;
}
@Override
public Payload next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
Payload payload = nextPayload;
nextPayload = getNextPayload();
return payload;
}
@Override
public void remove() {
throw new UnsupportedOperationException("Payload iterator does not support removal");
}
@Override
public Iterator<Payload> iterator() {
return this;
}
private Payload getNextPayload() {
ByteSource byteSource;
long byteSourceSize;
try {
if (offset >= input.size()) {
return null;
}
byteSource = input.slice(offset, readLen);
byteSourceSize = byteSource.size();
} catch (IOException e) {
throw Throwables.propagate(e);
}
Payload nextPayload = new ByteSourcePayload(byteSource);
ContentMetadata cm = metaData.toBuilder()
.contentLength(byteSourceSize)
.contentMD5((HashCode) null)
.build();
nextPayload.setContentMetadata(BaseMutableContentMetadata.fromContentMetadata(cm));
offset += byteSourceSize;
return nextPayload;
}
}
/**
* {@inheritDoc}
*/
@ -209,6 +272,8 @@ public class BasePayloadSlicer implements PayloadSlicer {
return doSlice((byte[]) rawContent, meta);
} else if (rawContent instanceof InputStream) {
return doSlice((InputStream) rawContent, meta);
} else if (rawContent instanceof ByteSource) {
return doSlice((ByteSource) rawContent, meta);
} else {
return doSlice(input, meta);
}
@ -220,23 +285,22 @@ public class BasePayloadSlicer implements PayloadSlicer {
}
protected Iterable<Payload> doSlice(String rawContent, ContentMetadata meta) {
return doSlice(rawContent.getBytes(Charsets.UTF_8), meta);
return doSlice(ByteSource.wrap(rawContent.getBytes(Charsets.UTF_8)), meta);
}
protected Iterable<Payload> doSlice(byte[] rawContent, ContentMetadata meta) {
return doSlice(new ByteArrayInputStream(rawContent), meta);
return doSlice(ByteSource.wrap(rawContent), meta);
}
protected Iterable<Payload> doSlice(File rawContent, ContentMetadata meta) {
try {
return doSlice(new FileInputStream(rawContent), meta);
} catch (FileNotFoundException e) {
throw Throwables.propagate(e);
}
return doSlice(Files.asByteSource(rawContent), meta);
}
protected Iterable<Payload> doSlice(InputStream rawContent, ContentMetadata meta) {
return new PayloadIterator(rawContent, meta);
return new InputStreamPayloadIterator(rawContent, meta);
}
protected Iterable<Payload> doSlice(ByteSource rawContent, ContentMetadata meta) {
return new ByteSourcePayloadIterator(rawContent, meta);
}
}

46
core/src/test/java/org/jclouds/io/internal/BasePayloadSlicerTest.java
View File

@ -24,7 +24,6 @@ import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Iterator;
import org.jclouds.io.ByteSources;
import org.jclouds.io.Payload;
import org.jclouds.io.PayloadSlicer;
import org.jclouds.io.payloads.ByteSourcePayload;
@ -33,7 +32,6 @@ import org.jclouds.util.Strings2;
import org.testng.annotations.Test;
import com.google.common.base.Charsets;
import com.google.common.collect.Iterables;
import com.google.common.io.ByteSource;
@Test
@ -71,14 +69,46 @@ public class BasePayloadSlicerTest {
}
@Test
public void testIterableSliceWithRepeatingByteSource() throws IOException {
String content = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\n"; /* 53 chars */
byte[] contentBytes = content.getBytes(Charsets.UTF_8);
ByteSource byteSource = ByteSources.repeatingArrayByteSource(contentBytes).slice(0, 1024);
public void testIterableSliceWithRepeatingByteSourceSmallerPartSize() throws IOException {
PayloadSlicer slicer = new BasePayloadSlicer();
ByteSource byteSource = ByteSource.wrap("aaaaaaaaaabbbbbbbbbbccccc".getBytes(Charsets.UTF_8)); /* 25 chars */
Payload payload = new ByteSourcePayload(byteSource);
assertEquals(Iterables.size(slicer.slice(payload, 100)), 11);
assertEquals(Iterables.size(slicer.slice(payload, 53)), 20);
Iterator<Payload> iter = slicer.slice(payload, 10).iterator();
Payload part;
assertTrue(iter.hasNext(), "Not enough results");
part = iter.next();
assertEquals(Strings2.toStringAndClose(part.getInput()), "aaaaaaaaaa");
assertEquals(part.getContentMetadata().getContentLength(), Long.valueOf(10));
assertTrue(iter.hasNext(), "Not enough results");
part = iter.next();
assertEquals(Strings2.toStringAndClose(part.getInput()), "bbbbbbbbbb");
assertEquals(part.getContentMetadata().getContentLength(), Long.valueOf(10));
assertTrue(iter.hasNext(), "Not enough results");
part = iter.next();
assertEquals(Strings2.toStringAndClose(part.getInput()), "ccccc");
assertEquals(part.getContentMetadata().getContentLength(), Long.valueOf(5));
assertFalse(iter.hasNext());
}
@Test
public void testIterableSliceWithRepeatingByteSourceLargerPartSize() throws IOException {
PayloadSlicer slicer = new BasePayloadSlicer();
ByteSource byteSource = ByteSource.wrap("aaaaaaaaaabbbbbbbbbbccccc".getBytes(Charsets.UTF_8)); /* 25 chars */
Payload payload = new ByteSourcePayload(byteSource);
Iterator<Payload> iter = slicer.slice(payload, 50).iterator();
Payload part;
assertTrue(iter.hasNext(), "Not enough results");
part = iter.next();
assertEquals(Strings2.toStringAndClose(part.getInput()), "aaaaaaaaaabbbbbbbbbbccccc");
assertEquals(part.getContentMetadata().getContentLength(), Long.valueOf(25));
assertFalse(iter.hasNext());
}
}