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+/*
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+ * Licensed to the Apache Software Foundation (ASF) under one or more
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+ * contributor license agreements. See the NOTICE file distributed with
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+ * this work for additional information regarding copyright ownership.
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+ * The ASF licenses this file to You under the Apache License, Version 2.0
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+ * (the "License"); you may not use this file except in compliance with
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+ * the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+package org.apache.dubbo.rpc.cluster.router.condition.config;
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+
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+import org.apache.dubbo.common.URL;
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+import org.apache.dubbo.common.config.configcenter.ConfigChangedEvent;
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+import org.apache.dubbo.common.config.configcenter.DynamicConfiguration;
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+import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
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+import org.apache.dubbo.common.logger.LoggerFactory;
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+import org.apache.dubbo.common.utils.CollectionUtils;
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+import org.apache.dubbo.common.utils.StringUtils;
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+import org.apache.dubbo.rpc.Invoker;
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+import org.apache.dubbo.rpc.cluster.router.state.BitList;
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+
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+import static org.apache.dubbo.common.constants.LoggerCodeConstants.CLUSTER_TAG_ROUTE_EMPTY;
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+import static org.apache.dubbo.common.utils.StringUtils.isEmpty;
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+
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+/**
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+ * Application level router, "application.condition-router"
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+ */
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+public class ProviderAppStateRouter<T> extends ListenableStateRouter<T> {
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+ private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(ListenableStateRouter.class);
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+ public static final String NAME = "PROVIDER_APP_ROUTER";
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+ private String application;
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+ private final String currentApplication;
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+
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+ public ProviderAppStateRouter(URL url) {
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+ super(url, url.getApplication());
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+ this.currentApplication = url.getApplication();
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+ }
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+
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+ @Override
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+ public void notify(BitList<Invoker<T>> invokers) {
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+ if (CollectionUtils.isEmpty(invokers)) {
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+ return;
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+ }
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+
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+ Invoker<T> invoker = invokers.get(0);
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+ URL url = invoker.getUrl();
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+ String providerApplication = url.getRemoteApplication();
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+
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+ // provider application is empty or equals with the current application
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+ if (isEmpty(providerApplication)) {
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+ logger.warn(CLUSTER_TAG_ROUTE_EMPTY, "condition router get providerApplication is empty, will not subscribe to provider app rules.", "", "");
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+ return;
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+ }
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+ if (providerApplication.equals(currentApplication)) {
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+ return;
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+ }
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+
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+ synchronized (this) {
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+ if (!providerApplication.equals(application)) {
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+ if (StringUtils.isNotEmpty(application)) {
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+ this.getRuleRepository().removeListener(application + RULE_SUFFIX, this);
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+ }
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+ String key = providerApplication + RULE_SUFFIX;
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+ this.getRuleRepository().addListener(key, this);
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+ application = providerApplication;
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+ String rawRule = this.getRuleRepository().getRule(key, DynamicConfiguration.DEFAULT_GROUP);
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+ if (StringUtils.isNotEmpty(rawRule)) {
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+ this.process(new ConfigChangedEvent(key, DynamicConfiguration.DEFAULT_GROUP, rawRule));
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+ }
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+ }
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+ }
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+ }
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+}
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