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RPCClient.java
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RPCClient.java
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package com.coolioasjulio.rpc.client;
import com.coolioasjulio.rpc.RPCException;
import com.coolioasjulio.rpc.RPCRequest;
import com.coolioasjulio.rpc.RPCResponse;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
public class RPCClient implements AutoCloseable {
private Gson gson;
private BufferedReader in;
private PrintStream out;
private long id;
/**
* Create an RPC client.
*
* @param in InputStream coming from the RPC server.
* @param out OutputStream going to the RPC server.
*/
public RPCClient(InputStream in, OutputStream out) {
gson = new Gson();
this.in = new BufferedReader(new InputStreamReader(in));
this.out = new PrintStream(out);
}
private <T> T sendRPCRequest(boolean instantiate, String className, String objectName, String methodName, String[] argClassNames, Object[] args) {
if (argClassNames.length != args.length) {
throw new IllegalArgumentException("argClassNames and args must have same length!");
}
RPCRequest request = new RPCRequest(id++, instantiate, className, objectName, methodName, argClassNames, args);
String jsonRequest = gson.toJson(request);
out.println(jsonRequest);
out.flush();
String jsonResponse;
try {
jsonResponse = in.readLine();
} catch (IOException e) {
e.printStackTrace();
return null;
}
RPCResponse tempResponse = gson.fromJson(jsonResponse, RPCResponse.class);
if (request.getId() != tempResponse.getId()) {
throw new RPCException("Somehow the calls are out of sync! Are you using multithreading?");
}
if (tempResponse.isException()) {
RPCResponse<String> exception = gson.fromJson(jsonResponse, (new TypeToken<RPCResponse<String>>() {}).getType());
throw new RuntimeException(exception.getValue());
}
RPCResponse<T> response = gson.fromJson(jsonResponse, (new TypeToken<RPCResponse<T>>() {}).getType());
return response.getValue();
}
/**
* Execute a static method.
*
* @param className The canonical name of the class which defines the static method.
* @param methodName The name of the static method to execute.
* @param <T> The return type.
* @return The result of the static method.
*/
public <T> T executeStaticMethod(String className, String methodName) {
return executeStaticMethod(className, methodName, new String[0], new Object[0]);
}
/**
* Execute a static method.
*
* @param className The canonical name of the class which defines the static method.
* @param methodName The name of the static method to execute.
* @param argClassNames The canonical names of the classes of the arguments to the method call. Corresponds to <code>args.</code>
* Prepend with REMOTE: to pass a remote object as an argument. If remote object, the corresponding
* value in <code>args</code> should a string representing the name of the remote object.
* @param args The objects to pass as arguments to the method. To pass a remote object, prepend the class
* name with REMOTE: and the arg should be the remote object name.
* @param <T> The return type.
* @return The result of the static method.
*/
public <T> T executeStaticMethod(String className, String methodName, String[] argClassNames, Object[] args) {
return sendRPCRequest(false, className, "", methodName, argClassNames, args);
}
/**
* Execute a static method.
*
* @param objectName The name of the remote object which defines the method to execute.
* @param methodName The name of the method to execute.
* @param <T> The return type.
* @return The result of the method.
*/
public <T> T executeMethod(String objectName, String methodName) {
return executeMethod(objectName, methodName, new String[0], new Object[0]);
}
/**
* Execute a method on a remote object.
*
* @param objectName The name of the remote object which defines the method to execute.
* @param methodName The name of the method to execute.
* @param argClassNames The canonical names of the classes of the arguments to the method call. Corresponds to <code>args.</code>
* Prepend with REMOTE: to pass a remote object as an argument. If remote object, the corresponding
* value in <code>args</code> should a string representing the name of the remote object.
* @param args The objects to pass as arguments to the method. To pass a remote object, prepend the class
* name with REMOTE: and the arg should be the remote object name.
* @param <T> The return type.
* @return The result of the method.
*/
public <T> T executeMethod(String objectName, String methodName, String[] argClassNames, Object[] args) {
return sendRPCRequest(false, "", objectName, methodName, argClassNames, args);
}
/**
* Execute a method on a static object.
*
* @param className The canonical name of the class which defines the static object.
* @param objectName The name of the static object which defines the method to execute.
* @param methodName The name of the method to execute.
* @param <T> The return type.
* @return The result of the method.
*/
public <T> T executeMethodOnStaticObject(String className, String objectName, String methodName) {
return executeMethodOnStaticObject(className, objectName, methodName, new String[0], new Object[0]);
}
/**
* Execute a method on a static object.
*
* @param className The canonical name of the class which defines the static object.
* @param objectName The name of the static object which defines the method to execute.
* @param methodName The name of the method to execute.
* @param argClassNames The canonical names of the classes of the arguments to the method call. Corresponds to <code>args.</code>
* Prepend with REMOTE: to pass a remote object as an argument. If remote object, the corresponding
* value in <code>args</code> should a string representing the name of the remote object.
* @param args The objects to pass as arguments to the method. To pass a remote object, prepend the class
* name with REMOTE: and the arg should be the remote object name.
* @param <T> The return type.
* @return The result of the method.
*/
public <T> T executeMethodOnStaticObject(String className, String objectName, String methodName, String[] argClassNames, Object[] args) {
return sendRPCRequest(false, className, objectName, methodName, argClassNames, args);
}
/**
* Instantiate a remote object.
*
* @param className The canonical name of the class to instantiate.
* @param objectName The name of the remote object that's being instantiated.
* @param <T> The return type.
* @return The instantiated object.
*/
public <T> T instantiateObject(String className, String objectName) {
return instantiateObject(className, objectName, new String[0], new Object[0]);
}
/**
* Instantiate a remote object.
*
* @param className The canonical name of the class to instantiate.
* @param objectName The name of the remote object that's being instantiated.
* @param argClassNames The canonical names of the classes of the arguments to the method call. Corresponds to <code>args.</code>
* Prepend with REMOTE: to pass a remote object as an argument. If remote object, the corresponding
* value in <code>args</code> should a string representing the name of the remote object.
* @param args The objects to pass as arguments to the method. To pass a remote object, prepend the class
* name with REMOTE: and the arg should be the remote object name.
* @param <T> The return type.
* @return The instantiated object.
*/
public <T> T instantiateObject(String className, String objectName, String[] argClassNames, Object[] args) {
return sendRPCRequest(true, className, objectName, "", argClassNames, args);
}
/**
* Close the RPC session. A closed RPC session cannot be used any more.
*
* @throws Exception If an error occurs while closing.
*/
@Override
public void close() throws Exception {
in.close();
out.close();
}
}