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add example of watch files

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This commit is contained in:
Chris Lu 2020-11-13 12:10:55 -08:00
parent 0d5355c614
commit 3e362451d2
3 changed files with 59 additions and 10 deletions
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9
other/java/client/src/main/java/seaweedfs/client/FilerClient.java
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@ -333,4 +333,13 @@ public class FilerClient {
return true;
}
public Iterator<FilerProto.SubscribeMetadataResponse> watch(String prefix, String clientName, long sinceNs) {
return filerGrpcClient.getBlockingStub().subscribeMetadata(FilerProto.SubscribeMetadataRequest.newBuilder()
.setPathPrefix(prefix)
.setClientName(clientName)
.setSinceNs(sinceNs)
.build()
);
}
}

12
other/java/examples/src/main/java/com/example/test/Example.java → other/java/examples/src/main/java/com/seaweedfs/examples/UnzipFile.java
View file

@ -1,4 +1,4 @@
package com.example.test;
package com.seaweedfs.examples;
import seaweed.hdfs.SeaweedInputStream;
import seaweedfs.client.FilerClient;
@ -10,22 +10,20 @@ import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class Example {
public static FilerClient filerClient = new FilerClient("localhost", 18888);
public static FilerGrpcClient filerGrpcClient = new FilerGrpcClient("localhost", 18888);
public class UnzipFile {
public static void main(String[] args) throws IOException {
FilerGrpcClient filerGrpcClient = new FilerGrpcClient("localhost", 18888);
FilerClient filerClient = new FilerClient(filerGrpcClient);
long startTime = System.currentTimeMillis();
// 本地模式，速度很快
parseZip("/Users/chris/tmp/test.zip");
long startTime2 = System.currentTimeMillis();
long localProcessTime = startTime2 - startTime;
// swfs读取，慢
SeaweedInputStream seaweedInputStream = new SeaweedInputStream(
filerGrpcClient,
new org.apache.hadoop.fs.FileSystem.Statistics(""),

42
other/java/examples/src/main/java/com/seaweedfs/examples/WatchFiles.java Normal file
View file

@ -0,0 +1,42 @@
package com.seaweedfs.examples;
import seaweedfs.client.FilerClient;
import seaweedfs.client.FilerGrpcClient;
import seaweedfs.client.FilerProto;
import java.io.IOException;
import java.util.Iterator;
public class WatchFiles {
public static void main(String[] args) throws IOException {
FilerGrpcClient filerGrpcClient = new FilerGrpcClient("localhost", 18888);
FilerClient filerClient = new FilerClient(filerGrpcClient);
Iterator<FilerProto.SubscribeMetadataResponse> watch = filerClient.watch(
"/buckets",
"exampleClient",
System.currentTimeMillis() * 1000000L
);
while (watch.hasNext()) {
FilerProto.SubscribeMetadataResponse event = watch.next();
FilerProto.EventNotification notification = event.getEventNotification();
if (notification.getNewParentPath() != null) {
// move an entry to a new directory, possibly with a new name
if (notification.hasOldEntry() && notification.hasNewEntry()) {
System.out.println("move " + event.getDirectory() + "/" + notification.getOldEntry().getName() + " to " + notification.getNewParentPath() + "/" + notification.getNewEntry().getName());
} else {
System.out.println("this should not happen.");
}
} else if (notification.hasNewEntry() && !notification.hasOldEntry()) {
System.out.println("create entry " + event.getDirectory() + "/" + notification.getNewEntry().getName());
} else if (!notification.hasNewEntry() && notification.hasOldEntry()) {
System.out.println("delete entry " + event.getDirectory() + "/" + notification.getOldEntry().getName());
} else if (notification.hasNewEntry() && notification.hasOldEntry()) {
System.out.println("updated entry " + event.getDirectory() + "/" + notification.getNewEntry().getName());
}
}
}
}