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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.rpc.protocol.tri.service;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.stream.StreamObserver;
import org.apache.dubbo.rpc.RpcContext;
import org.apache.dubbo.rpc.TriRpcStatus;
import io.grpc.health.v1.DubboHealthTriple;
import io.grpc.health.v1.HealthCheckRequest;
import io.grpc.health.v1.HealthCheckResponse;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.PROTOCOL_CLOSED_SERVER;
public class TriHealthImpl extends DubboHealthTriple.HealthImplBase {
private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(TriHealthImpl.class);
// Due to the latency of rpc calls, synchronization of the map does not help with consistency.
// However, need use ConcurrentHashMap to allow concurrent reading by check().
private final Map statusMap = new ConcurrentHashMap<>();
private final Object watchLock = new Object();
// Technically a Multimap>. The Boolean value is not
// used. The StreamObservers need to be kept in an identity-equality set, to make sure
// user-defined equals() doesn't confuse our book-keeping of the StreamObservers. Constructing
// such Multimap would require extra lines and the end result is not significantly simpler, thus I
// would rather not have the Guava collections dependency.
private final HashMap, Boolean>> watchers = new HashMap<>();
// Indicates if future status changes should be ignored.
private boolean terminal;
public TriHealthImpl() {
// Copy of what Go and C++ do.
statusMap.put(HealthStatusManager.SERVICE_NAME_ALL_SERVICES,
HealthCheckResponse.ServingStatus.SERVING);
}
private static HealthCheckResponse getResponseForWatch(
HealthCheckResponse.ServingStatus recordedStatus) {
return HealthCheckResponse.newBuilder()
.setStatus(recordedStatus == null ? HealthCheckResponse.ServingStatus.SERVICE_UNKNOWN
: recordedStatus)
.build();
}
@Override
public HealthCheckResponse check(HealthCheckRequest request) {
HealthCheckResponse.ServingStatus status = statusMap.get(request.getService());
if (status != null) {
return HealthCheckResponse.newBuilder().setStatus(status).build();
}
throw TriRpcStatus.NOT_FOUND.withDescription("unknown service " + request.getService())
.asException();
}
@Override
public void watch(HealthCheckRequest request,
StreamObserver responseObserver) {
final String service = request.getService();
synchronized (watchLock) {
HealthCheckResponse.ServingStatus status = statusMap.get(service);
responseObserver.onNext(getResponseForWatch(status));
IdentityHashMap, Boolean> serviceWatchers = watchers.get(
service);
if (serviceWatchers == null) {
serviceWatchers = new IdentityHashMap<>();
watchers.put(service, serviceWatchers);
}
serviceWatchers.put(responseObserver, Boolean.TRUE);
}
RpcContext.getCancellationContext().addListener(context -> {
synchronized (watchLock) {
IdentityHashMap, Boolean> serviceWatchers = watchers.get(
service);
if (serviceWatchers != null) {
serviceWatchers.remove(responseObserver);
if (serviceWatchers.isEmpty()) {
watchers.remove(service);
}
}
}
});
}
void setStatus(String service, HealthCheckResponse.ServingStatus status) {
synchronized (watchLock) {
if (terminal) {
logger.info("Ignoring status " + status + " for " + service);
return;
}
setStatusInternal(service, status);
}
}
private void setStatusInternal(String service, HealthCheckResponse.ServingStatus status) {
HealthCheckResponse.ServingStatus prevStatus = statusMap.put(service, status);
if (prevStatus != status) {
notifyWatchers(service, status);
}
}
void clearStatus(String service) {
synchronized (watchLock) {
if (terminal) {
logger.info("Ignoring status clearing for " + service);
return;
}
HealthCheckResponse.ServingStatus prevStatus = statusMap.remove(service);
if (prevStatus != null) {
notifyWatchers(service, null);
}
}
}
void enterTerminalState() {
synchronized (watchLock) {
if (terminal) {
logger.warn(PROTOCOL_CLOSED_SERVER, "", "", "Already terminating", new RuntimeException());
return;
}
terminal = true;
for (String service : statusMap.keySet()) {
setStatusInternal(service, HealthCheckResponse.ServingStatus.NOT_SERVING);
}
}
}
private void notifyWatchers(String service, HealthCheckResponse.ServingStatus status) {
HealthCheckResponse response = getResponseForWatch(status);
IdentityHashMap, Boolean> serviceWatchers = watchers.get(
service);
if (serviceWatchers != null) {
for (StreamObserver responseObserver : serviceWatchers.keySet()) {
responseObserver.onNext(response);
}
}
}
}