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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 sample;
import static java.lang.System.in;
import static java.lang.System.out;
import static java.util.Collections.emptyList;
import static java.util.Collections.singletonList;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import org.apache.tuscany.sca.node.Contribution;
import org.apache.tuscany.sca.node.Node;
import org.apache.tuscany.sca.node.NodeFactory;
/**
* A little SCA command shell.
*/
public class Shell {
final NodeFactory nf;
public static class Nodeconf {
final String name;
final String cloc;
final String dcuri;
final Node node;
Nodeconf(final String name, final String cloc, final String dcuri, final Node node) {
this.name = name;
this.cloc = cloc;
this.dcuri = dcuri;
this.node = node;
}
public String toString() {
return name + " " + cloc + (dcuri != null? " " + dcuri : "");
}
}
final Map<String, Nodeconf> nodes = new HashMap<String, Nodeconf>();
final List<String> history = new ArrayList<String>();
public Shell(NodeFactory nf) {
this.nf = nf;
}
List<?> start(final String name, final String cloc, final String dcuri) {
if(nodes.containsKey(name))
return emptyList();
final Node node = dcuri != null? nf.createNode(dcuri, new Contribution(cloc, cloc)) : nf.createNode(new Contribution(cloc, cloc));
nodes.put(name, new Nodeconf(name, cloc, dcuri, node));
node.start();
return emptyList();
}
List<?> stop(final String name) {
final Nodeconf ninfo = nodes.get(name);
if(ninfo == null)
return emptyList();
ninfo.node.stop();
nodes.remove(name);
return emptyList();
}
List<?> stop() {
for(Nodeconf ninfo: nodes.values())
ninfo.node.stop();
nodes.clear();
return emptyList();
}
List<?> restart(final String name, final String cloc, final String dcuri) {
final Nodeconf ninfo = nodes.get(name);
if(ninfo == null)
return start(name, cloc, dcuri);
ninfo.node.stop();
nodes.remove(name);
if (cloc == null)
return start(ninfo.name, ninfo.cloc, ninfo.dcuri);
return start(name, cloc, dcuri);
}
List<?> status() {
return new ArrayList<Object>(nodes.values());
}
List<?> history() {
return history;
}
List<?> bye() {
return null;
}
List<String> read(final BufferedReader r) throws IOException {
final String l = r.readLine();
history.add(l);
return l != null ? Arrays.asList(l.split(" ")) : singletonList("bye");
}
Callable<List<?>> eval(final List<String> toks) {
final String op = toks.get(0);
if(op.equals("start"))
return new Callable<List<?>>() {
public List<?> call() {
return start(toks.get(1), toks.get(2), toks.size() >= 4? toks.get(3) : null);
}
};
if(op.equals("stop"))
return new Callable<List<?>>() {
public List<?> call() {
if(toks.size() == 1)
return stop();
return stop(toks.get(1));
}
};
if(op.equals("restart"))
return new Callable<List<?>>() {
public List<?> call() {
return restart(toks.get(1), toks.size() >= 3? toks.get(2) : null, toks.size() >= 4? toks.get(3) : null);
}
};
if(op.equals("status"))
return new Callable<List<?>>() {
public List<?> call() {
return status();
}
};
if(op.equals("history"))
return new Callable<List<?>>() {
public List<?> call() {
return history();
}
};
if(op.equals("bye"))
return new Callable<List<?>>() {
public List<?> call() {
return bye();
}
};
return new Callable<List<?>>() {
public List<?> call() {
return emptyList();
}
};
}
List<?> apply(final Callable<List<?>> func) {
try {
return func.call();
} catch(Exception e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
return singletonList(sw);
}
}
boolean print(final List<?> l, PrintWriter w) {
if(l == null)
return false;
for(Object o: l)
w.println(o);
return true;
}
public Map<String, Nodeconf> run(final BufferedReader r, final PrintWriter w) throws IOException {
while(print(apply(eval(read(r))), w))
;
r.close();
return nodes;
}
public static void main(final String[] args) throws Exception {
new Shell(NodeFactory.newInstance()).run(new BufferedReader(new InputStreamReader(in)), new PrintWriter(out, true));
}
}
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