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[BAEL-4849] Article code (#10566)

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psevestre 2021-03-18 16:15:04 -03:00 committed by GitHub
parent 438b8163ca
commit d1a87c711b
8 changed files with 218 additions and 0 deletions
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6
kubernetes/k8s-intro/pom.xml
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@ -16,6 +16,12 @@
<artifactId>client-java</artifactId>
<version>11.0.0</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
</dependencies>
<build>

11
kubernetes/k8s-intro/src/main/java/com/baeldung/kubernetes/intro/ApiInvoker.java Normal file
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@ -0,0 +1,11 @@
package com.baeldung.kubernetes.intro;
import io.kubernetes.client.openapi.ApiCallback;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import okhttp3.Call;
@FunctionalInterface
public interface ApiInvoker<R> {
Call apply(CoreV1Api api, ApiCallback<R> callback) throws ApiException;
}

74
kubernetes/k8s-intro/src/main/java/com/baeldung/kubernetes/intro/AsyncHelper.java Normal file
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@ -0,0 +1,74 @@
package com.baeldung.kubernetes.intro;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Future;
import java.util.function.BiFunction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.kubernetes.client.openapi.ApiCallback;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import okhttp3.Call;
public class AsyncHelper<R> implements ApiCallback<R> {
private static final Logger log = LoggerFactory.getLogger(AsyncHelper.class);
private CoreV1Api api;
private CompletableFuture<R> callResult;
private AsyncHelper(CoreV1Api api) {
this.api = api;
}
public static <T> CompletableFuture<T> doAsync(CoreV1Api api, ApiInvoker<T> invoker) {
AsyncHelper<T> p = new AsyncHelper<>(api);
return p.execute(invoker);
}
private CompletableFuture<R> execute( ApiInvoker<R> invoker) {
try {
callResult = new CompletableFuture<>();
log.info("[I38] Calling API...");
final Call call = invoker.apply(api,this);
log.info("[I41] API Succesfully invoked: method={}, url={}",
call.request().method(),
call.request().url());
return callResult;
}
catch(ApiException aex) {
callResult.completeExceptionally(aex);
return callResult;
}
}
@Override
public void onFailure(ApiException e, int statusCode, Map<String, List<String>> responseHeaders) {
log.error("[E53] onFailure",e);
callResult.completeExceptionally(e);
}
@Override
public void onSuccess(R result, int statusCode, Map<String, List<String>> responseHeaders) {
log.error("[E61] onSuccess: statusCode={}",statusCode);
callResult.complete(result);
}
@Override
public void onUploadProgress(long bytesWritten, long contentLength, boolean done) {
log.info("[E61] onUploadProgress: bytesWritten={}, contentLength={}, done={}",bytesWritten,contentLength,done);
}
@Override
public void onDownloadProgress(long bytesRead, long contentLength, boolean done) {
log.info("[E75] onDownloadProgress: bytesRead={}, contentLength={}, done={}",bytesRead,contentLength,done);
}
}

50
kubernetes/k8s-intro/src/main/java/com/baeldung/kubernetes/intro/ListNodesAsync.java Normal file
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@ -0,0 +1,50 @@
/**
*
*/
package com.baeldung.kubernetes.intro;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1NodeList;
import io.kubernetes.client.util.Config;
/**
* @author Philippe
*
*/
public class ListNodesAsync {
private static Logger log = LoggerFactory.getLogger(ListNodesAsync.class);
/**
* @param args
*/
public static void main(String[] args) throws Exception {
// Initial setup
ApiClient client = Config.defaultClient();
CoreV1Api api = new CoreV1Api(client);
// Start async call
CompletableFuture<V1NodeList> p = AsyncHelper.doAsync(api,(capi,cb) ->
capi.listNodeAsync(null, null, null, null, null, null, null, null, 10, false, cb)
);
p.thenAcceptAsync((nodeList) -> {
log.info("[I40] Processing results...");
nodeList.getItems()
.stream()
.forEach((node) -> System.out.println(node.getMetadata()));
});
log.info("[I46] Waiting results...");
p.get(10, TimeUnit.SECONDS);
}
}

46
kubernetes/k8s-intro/src/main/java/com/baeldung/kubernetes/intro/ListPodsPaged.java Normal file
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@ -0,0 +1,46 @@
/**
*
*/
package com.baeldung.kubernetes.intro;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1NodeList;
import io.kubernetes.client.openapi.models.V1PodList;
import io.kubernetes.client.util.Config;
/**
* @author Philippe
*
*/
public class ListPodsPaged {
private static final Logger log = LoggerFactory.getLogger(ListPodsPaged.class);
/**
* @param args
*/
public static void main(String[] args) throws Exception {
ApiClient client = Config.defaultClient();
CoreV1Api api = new CoreV1Api(client);
String continuationToken = null;
int limit = 2; // Just for illustration purposes. Real world values would range from ~100 to ~1000/page
Long remaining = null;
do {
log.info("==========================================================================");
log.info("Retrieving data: continuationToken={}, remaining={}", continuationToken,remaining);
V1PodList items = api.listPodForAllNamespaces(null, continuationToken, null, null, limit, null, null, null, 10, false);
continuationToken = items.getMetadata().getContinue();
remaining = items.getMetadata().getRemainingItemCount();
items.getItems()
.stream()
.forEach((node) -> System.out.println(node.getMetadata()));
} while( continuationToken != null );
}
}

10
kubernetes/k8s-intro/src/test/java/com/baeldung/kubernetes/intro/ListNodesAsyncLiveTest.java Normal file
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@ -0,0 +1,10 @@
package com.baeldung.kubernetes.intro;
import org.junit.jupiter.api.Test;
class ListNodesAsyncLiveTest {
@Test
void whenListNodes_thenSuccess() throws Exception {
ListNodesAsync.main(new String[] {});
}
}

10
kubernetes/k8s-intro/src/test/java/com/baeldung/kubernetes/intro/ListPodsPagedLiveTest.java Normal file
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@ -0,0 +1,10 @@
package com.baeldung.kubernetes.intro;
import org.junit.jupiter.api.Test;
class ListPodsPagedLiveTest {
@Test
void whenListPodsPage_thenSuccess() throws Exception {
ListPodsPaged.main(new String[] {});
}
}

11
kubernetes/k8s-intro/src/test/resources/logback.xml Normal file
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@ -0,0 +1,11 @@
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="debug">
<appender-ref ref="STDOUT" />
</root>
</configuration>