Downstream command protocol example. (#2380)

* Downstream command protocol example.

* Add wait seconds arguments into meta data reset command.

* Style consistent issue fixed.

* Add serialNumber arguments for agent to check if the command duplicate.

* Command separate.

* Update TraceIgnoreCommand.java

Keep TraceIgnoreCommand just named `TraceIgnore`

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/BaseCommand.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.*;
+
+/**
+ * @author peng-yongsheng
+ */
+public abstract class BaseCommand {
+
+    private final String command;
+    private final String serialNumber;
+    private final Command.Builder commandBuilder;
+
+    BaseCommand(String command, String serialNumber) {
+        this.command = command;
+        this.serialNumber = serialNumber;
+        this.commandBuilder = Command.newBuilder();
+
+        KeyStringValuePair.Builder arguments = KeyStringValuePair.newBuilder();
+        arguments.setKey("SerialNumber");
+        arguments.setValue(serialNumber);
+
+        this.commandBuilder.setCommand(command);
+        this.commandBuilder.addArgs(arguments);
+    }
+
+    Command.Builder commandBuilder() {
+        return commandBuilder;
+    }
+
+    public String getCommand() {
+        return command;
+    }
+
+    public String getSerialNumber() {
+        return serialNumber;
+    }
+}

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/Deserializable.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.Command;
+
+/**
+ * @author peng-yongsheng
+ */
+public interface Deserializable {
+    void deserialize(Command command);
+}

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/EndpointResetCommand.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.*;
+
+/**
+ * Remove the specified endpoint names from endpoint metadata cache, and re-register it.
+ * If not specified, clear whole endpoint metadata cache.
+ *
+ * @author peng-yongsheng
+ */
+public class EndpointResetCommand extends BaseCommand implements Serializable {
+
+    public EndpointResetCommand(String serialNumber) {
+        super("EndpointMetadataReset", serialNumber);
+    }
+
+    @Override public Command.Builder serialize() {
+        return commandBuilder();
+    }
+
+    public void addSpecifiedEndpointName(String endpointName) {
+        KeyStringValuePair.Builder arguments = KeyStringValuePair.newBuilder();
+        arguments.setKey("EndpointName");
+        arguments.setValue(endpointName);
+        commandBuilder().addArgs(arguments);
+    }
+}

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/InstanceResetCommand.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.Command;
+
+/**
+ * Clear the service instance metadata cache, and re-register it.
+ *
+ * @author peng-yongsheng
+ */
+public class InstanceResetCommand extends BaseCommand implements Serializable {
+
+    public InstanceResetCommand(String serialNumber) {
+        super("InstanceMetadataReset", serialNumber);
+    }
+
+    @Override public Command.Builder serialize() {
+        return commandBuilder();
+    }
+}

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/NetworkResetCommand.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.*;
+
+/**
+ * Remove the specified network addresses from network address metadata cache, and re-register it.
+ * If not specified, clear whole network address metadata cache.
+ *
+ * @author peng-yongsheng
+ */
+public class NetworkResetCommand extends BaseCommand implements Serializable {
+
+    public NetworkResetCommand(String serialNumber) {
+        super("NetworkAddressMetadataReset", serialNumber);
+    }
+
+    @Override public Command.Builder serialize() {
+        return commandBuilder();
+    }
+
+    public void addSpecifiedNetworkAddress(String networkAddress) {
+        KeyStringValuePair.Builder arguments = KeyStringValuePair.newBuilder();
+        arguments.setKey("NetworkAddress");
+        arguments.setValue(networkAddress);
+        commandBuilder().addArgs(arguments);
+    }
+}

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/Serializable.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.Command;
+
+/**
+ * @author peng-yongsheng
+ */
+public interface Serializable {
+    Command.Builder serialize();
+}

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/ServiceResetCommand.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.Command;
+
+/**
+ * Clear the service metadata cache and other metadata caches belong to it, and re-register them.
+ *
+ * @author peng-yongsheng
+ */
+public class ServiceResetCommand extends BaseCommand implements Serializable {
+
+    public ServiceResetCommand(String serialNumber) {
+        super("ServiceMetadataReset", serialNumber);
+    }
+
+    @Override public Command.Builder serialize() {
+        return commandBuilder();
+    }
+}

apm-protocol/apm-network/src/main/java/org/apache/skywalking/apm/network/trace/component/command/TraceIgnoreCommand.java

+/*
+ * 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.skywalking.apm.network.trace.component.command;
+
+import org.apache.skywalking.apm.network.common.*;
+
+/**
+ * Trace ignore sync, each configuration downstream is the full amount of data related to the received agent.
+ *
+ * @author peng-yongsheng
+ */
+public class TraceIgnoreCommand extends BaseCommand implements Serializable {
+
+    public TraceIgnoreCommand(String serialNumber) {
+        super("TraceIgnore", serialNumber);
+    }
+
+    @Override public Command.Builder serialize() {
+        return commandBuilder();
+    }
+
+    public void addRule(String path) {
+        KeyStringValuePair.Builder arguments = KeyStringValuePair.newBuilder();
+        arguments.setKey("Path");
+        arguments.setValue(path);
+        commandBuilder().addArgs(arguments);
+    }
+}