Fluent style builder API support(#3431)

dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/builders/AbstractBuilder.java

@@ -0,0 +1,69 @@
+/*
+ * 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.config.builders;
+
+import org.apache.dubbo.common.utils.StringUtils;
+import org.apache.dubbo.config.AbstractConfig;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * AbstractBuilder
+ *
+ * @since 2.7
+ */
+public abstract class AbstractBuilder<T extends AbstractConfig, B extends AbstractBuilder> {
+    /**
+     * The config id
+     */
+    protected String id;
+    protected String prefix;
+
+    protected B id(String id) {
+        this.id = id;
+        return getThis();
+    }
+
+    protected B prefix(String prefix) {
+        this.prefix = prefix;
+        return getThis();
+    }
+
+    protected abstract B getThis();
+
+    protected static Map<String, String> appendParameter(Map<String, String> parameters, String key, String value) {
+        if (parameters == null) {
+            parameters = new HashMap<>();
+        }
+        parameters.put(key, value);
+        return parameters;
+    }
+
+    protected static Map<String, String> appendParameters(Map<String, String> parameters, Map<String, String> appendParameters) {
+        if (parameters == null) {
+            parameters = new HashMap<>();
+        }
+        parameters.putAll(appendParameters);
+        return parameters;
+    }
+
+    protected void build(T instance) {
+        if (!StringUtils.isEmpty(id)) instance.setId(id);
+        if (!StringUtils.isEmpty(prefix)) instance.setPrefix(prefix);
+    }
+}

dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/builders/AbstractInterfaceBuilder.java

@@ -0,0 +1,294 @@
+/*
+ * 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.config.builders;
+
+import org.apache.dubbo.common.utils.StringUtils;
+import org.apache.dubbo.config.AbstractInterfaceConfig;
+import org.apache.dubbo.config.ApplicationConfig;
+import org.apache.dubbo.config.ConfigCenterConfig;
+import org.apache.dubbo.config.MetadataReportConfig;
+import org.apache.dubbo.config.ModuleConfig;
+import org.apache.dubbo.config.MonitorConfig;
+import org.apache.dubbo.config.RegistryConfig;
+import org.apache.dubbo.rpc.Filter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * AbstractBuilder
+ *
+ * @since 2.7
+ */
+public abstract class AbstractInterfaceBuilder<T extends AbstractInterfaceConfig, B extends AbstractInterfaceBuilder<T, B>>
+        extends AbstractMethodBuilder<T, B> {
+    /**
+     * Local impl class name for the service interface
+     */
+    protected String local;
+
+    /**
+     * Local stub class name for the service interface
+     */
+    protected String stub;
+
+    /**
+     * Service monitor
+     */
+    protected MonitorConfig monitor;
+
+    /**
+     * Strategies for generating dynamic agents，there are two strategies can be choosed: jdk and javassist
+     */
+    protected String proxy;
+
+    /**
+     * Cluster type
+     */
+    protected String cluster;
+
+    /**
+     * The {@link Filter} when the provider side exposed a service or the customer side references a remote service used,
+     * if there are more than one, you can use commas to separate them
+     */
+    protected String filter;
+
+    /**
+     * The Listener when the provider side exposes a service or the customer side references a remote service used
+     * if there are more than one, you can use commas to separate them
+     */
+    protected String listener;
+
+    /**
+     * The owner of the service providers
+     */
+    protected String owner;
+
+    /**
+     * Connection limits, 0 means shared connection, otherwise it defines the connections delegated to the current service
+     */
+    protected Integer connections;
+
+    /**
+     * The layer of service providers
+     */
+    protected String layer;
+
+    /**
+     * The application info
+     */
+    protected ApplicationConfig application;
+
+    /**
+     * The module info
+     */
+    protected ModuleConfig module;
+
+    /**
+     * Registry centers
+     */
+    protected List<RegistryConfig> registries;
+
+    protected String registryIds;
+
+    // connection events
+    protected String onconnect;
+
+    /**
+     * Disconnection events
+     */
+    protected String ondisconnect;
+    protected MetadataReportConfig metadataReportConfig;
+
+    protected ConfigCenterConfig configCenter;
+
+    // callback limits
+    private Integer callbacks;
+    // the scope for referring/exporting a service, if it's local, it means searching in current JVM only.
+    private String scope;
+
+    /**
+     * @param local
+     * @see org.apache.dubbo.config.builders.AbstractInterfaceBuilder#stub(String)
+     * @deprecated Replace to <code>stub(String)</code>
+     */
+    @Deprecated
+    public B local(String local) {
+        this.local = local;
+        return getThis();
+    }
+
+    /**
+     * @param local
+     * @see org.apache.dubbo.config.builders.AbstractInterfaceBuilder#stub(Boolean)
+     * @deprecated Replace to <code>stub(Boolean)</code>
+     */
+    @Deprecated
+    public B local(Boolean local) {
+        if (local != null) {
+            this.local = local.toString();
+        } else {
+            this.local = null;
+        }
+        return getThis();
+    }
+
+    public B stub(String stub) {
+        this.stub = stub;
+        return getThis();
+    }
+
+    public B stub(Boolean stub) {
+        if (stub != null) {
+            this.stub = stub.toString();
+        } else {
+            this.stub = null;
+        }
+        return getThis();
+    }
+
+    public B monitor(MonitorConfig monitor) {
+        this.monitor = monitor;
+        return getThis();
+    }
+
+    public B monitor(String monitor) {
+        this.monitor = new MonitorConfig(monitor);
+        return getThis();
+    }
+
+    public B proxy(String proxy) {
+        this.proxy = proxy;
+        return getThis();
+    }
+
+    public B cluster(String cluster) {
+        this.cluster = cluster;
+        return getThis();
+    }
+
+    public B filter(String filter) {
+        this.filter = filter;
+        return getThis();
+    }
+
+    public B listener(String listener) {
+        this.listener = listener;
+        return getThis();
+    }
+
+    public B owner(String owner) {
+        this.owner = owner;
+        return getThis();
+    }
+
+    public B connections(Integer connections) {
+        this.connections = connections;
+        return getThis();
+    }
+
+    public B layer(String layer) {
+        this.layer = layer;
+        return getThis();
+    }
+
+    public B application(ApplicationConfig application) {
+        this.application = application;
+        return getThis();
+    }
+
+    public B module(ModuleConfig module) {
+        this.module = module;
+        return getThis();
+    }
+
+    public B addRegistries(List<RegistryConfig> registries) {
+        if (this.registries == null) {
+            this.registries = new ArrayList<>();
+        }
+        this.registries.addAll(registries);
+        return getThis();
+    }
+
+    public B addRegistry(RegistryConfig registry) {
+        if (this.registries == null) {
+            this.registries = new ArrayList<>();
+        }
+        this.registries.add(registry);
+        return getThis();
+    }
+
+    public B registryIds(String registryIds) {
+        this.registryIds = registryIds;
+        return getThis();
+    }
+
+    public B onconnect(String onconnect) {
+        this.onconnect = onconnect;
+        return getThis();
+    }
+
+    public B ondisconnect(String ondisconnect) {
+        this.ondisconnect = ondisconnect;
+        return getThis();
+    }
+
+    public B metadataReportConfig(MetadataReportConfig metadataReportConfig) {
+        this.metadataReportConfig = metadataReportConfig;
+        return getThis();
+    }
+
+    public B configCenter(ConfigCenterConfig configCenter) {
+        this.configCenter = configCenter;
+        return getThis();
+    }
+
+    public B callbacks(Integer callbacks) {
+        this.callbacks = callbacks;
+        return getThis();
+    }
+
+    public B scope(String scope) {
+        this.scope = scope;
+        return getThis();
+    }
+
+    public void build(T instance) {
+        super.build(instance);
+
+        if (!StringUtils.isEmpty(local)) instance.setLocal(local);
+        if (!StringUtils.isEmpty(stub)) instance.setStub(stub);
+        if (monitor != null) instance.setMonitor(monitor);
+        if (!StringUtils.isEmpty(proxy)) instance.setProxy(proxy);
+        if (!StringUtils.isEmpty(cluster)) instance.setCluster(cluster);
+        if (!StringUtils.isEmpty(filter)) instance.setFilter(filter);
+        if (!StringUtils.isEmpty(listener)) instance.setListener(listener);
+        if (!StringUtils.isEmpty(owner)) instance.setOwner(owner);
+        if (connections != null) instance.setConnections(connections);
+        if (!StringUtils.isEmpty(layer)) instance.setLayer(layer);
+        if (application != null) instance.setApplication(application);
+        if (module != null) instance.setModule(module);
+        if (registries != null) instance.setRegistries(registries);
+        if (!StringUtils.isEmpty(registryIds)) instance.setRegistryIds(registryIds);
+        if (!StringUtils.isEmpty(onconnect)) instance.setOnconnect(onconnect);
+        if (!StringUtils.isEmpty(ondisconnect)) instance.setOndisconnect(ondisconnect);
+        if (metadataReportConfig != null) instance.setMetadataReportConfig(metadataReportConfig);
+        if (configCenter != null) instance.setConfigCenter(configCenter);
+        if (callbacks != null) instance.setCallbacks(callbacks);
+        if (!StringUtils.isEmpty(scope)) instance.setScope(scope);
+    }
+}