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Abstract RemoteNodeState HTTP implementation to HttpRemoteNodeState
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presto-main/src/main/java/com/facebook/presto/metadata/HttpRemoteNodeState.java
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| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.facebook.presto.metadata; | ||
|
|
||
| import com.facebook.airlift.http.client.FullJsonResponseHandler.JsonResponse; | ||
| import com.facebook.airlift.http.client.HttpClient; | ||
| import com.facebook.airlift.http.client.HttpClient.HttpResponseFuture; | ||
| import com.facebook.airlift.http.client.Request; | ||
| import com.facebook.airlift.log.Logger; | ||
| import com.facebook.presto.spi.NodeState; | ||
| import com.google.common.util.concurrent.FutureCallback; | ||
| import com.google.common.util.concurrent.Futures; | ||
| import io.airlift.units.Duration; | ||
|
|
||
| import javax.annotation.Nullable; | ||
| import javax.annotation.concurrent.ThreadSafe; | ||
|
|
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| import java.net.URI; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.Future; | ||
| import java.util.concurrent.atomic.AtomicLong; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
|
|
||
| import static com.facebook.airlift.http.client.FullJsonResponseHandler.createFullJsonResponseHandler; | ||
| import static com.facebook.airlift.http.client.HttpStatus.OK; | ||
| import static com.facebook.airlift.http.client.Request.Builder.prepareGet; | ||
| import static com.facebook.airlift.json.JsonCodec.jsonCodec; | ||
| import static com.google.common.net.MediaType.JSON_UTF_8; | ||
| import static com.google.common.util.concurrent.MoreExecutors.directExecutor; | ||
| import static io.airlift.units.Duration.nanosSince; | ||
| import static java.util.Objects.requireNonNull; | ||
| import static java.util.concurrent.TimeUnit.SECONDS; | ||
| import static javax.ws.rs.core.HttpHeaders.CONTENT_TYPE; | ||
|
|
||
| @ThreadSafe | ||
| public class HttpRemoteNodeState | ||
| implements RemoteNodeState | ||
| { | ||
| private static final Logger log = Logger.get(HttpRemoteNodeState.class); | ||
|
|
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| private final HttpClient httpClient; | ||
| private final URI stateInfoUri; | ||
| private final AtomicReference<Optional<NodeState>> nodeState = new AtomicReference<>(Optional.empty()); | ||
| private final AtomicReference<Future<?>> future = new AtomicReference<>(); | ||
| private final AtomicLong lastUpdateNanos = new AtomicLong(); | ||
| private final AtomicLong lastWarningLogged = new AtomicLong(); | ||
|
|
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| public HttpRemoteNodeState(HttpClient httpClient, URI stateInfoUri) | ||
| { | ||
| this.httpClient = requireNonNull(httpClient, "httpClient is null"); | ||
| this.stateInfoUri = requireNonNull(stateInfoUri, "stateInfoUri is null"); | ||
| } | ||
|
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| @Override | ||
| public Optional<NodeState> getNodeState() | ||
| { | ||
| return nodeState.get(); | ||
| } | ||
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| @Override | ||
| public synchronized void asyncRefresh() | ||
| { | ||
| Duration sinceUpdate = nanosSince(lastUpdateNanos.get()); | ||
| if (nanosSince(lastWarningLogged.get()).toMillis() > 1_000 && | ||
| sinceUpdate.toMillis() > 10_000 && | ||
| future.get() != null) { | ||
| log.warn("Node state update request to %s has not returned in %s", stateInfoUri, sinceUpdate.toString(SECONDS)); | ||
| lastWarningLogged.set(System.nanoTime()); | ||
| } | ||
| if (sinceUpdate.toMillis() > 1_000 && future.get() == null) { | ||
| Request request = prepareGet() | ||
| .setUri(stateInfoUri) | ||
| .setHeader(CONTENT_TYPE, JSON_UTF_8.toString()) | ||
| .build(); | ||
| HttpResponseFuture<JsonResponse<NodeState>> responseFuture = httpClient.executeAsync(request, createFullJsonResponseHandler(jsonCodec(NodeState.class))); | ||
| future.compareAndSet(null, responseFuture); | ||
|
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| Futures.addCallback(responseFuture, new FutureCallback<JsonResponse<NodeState>>() | ||
| { | ||
| @Override | ||
| public void onSuccess(@Nullable JsonResponse<NodeState> result) | ||
| { | ||
| lastUpdateNanos.set(System.nanoTime()); | ||
| future.compareAndSet(responseFuture, null); | ||
| if (result != null) { | ||
| if (result.hasValue()) { | ||
| nodeState.set(Optional.ofNullable(result.getValue())); | ||
| } | ||
| if (result.getStatusCode() != OK.code()) { | ||
| log.warn("Error fetching node state from %s returned status %d: %s", stateInfoUri, result.getStatusCode(), result.getStatusMessage()); | ||
| return; | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void onFailure(Throwable t) | ||
| { | ||
| log.warn("Error fetching node state from %s: %s", stateInfoUri, t.getMessage()); | ||
| lastUpdateNanos.set(System.nanoTime()); | ||
| future.compareAndSet(responseFuture, null); | ||
| } | ||
| }, directExecutor()); | ||
| } | ||
| } | ||
| } |
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