/**
* 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 demo.jaxrs.server;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.StreamingOutput;
import org.apache.cxf.transport.websocket.WebSocketConstants;
@Path("/customerservice/")
@Produces("text/xml")
public class CustomerService {
private static final int MAX_ERROR_COUNT = 5;
private static ExecutorService executor = Executors.newSingleThreadExecutor();
long currentId = 123;
Map<Long, Customer> customers = new HashMap<>();
Map<Long, Order> orders = new HashMap<>();
Map<String, WriterHolder<OutputStream>> monitors = new HashMap<>();
Map<String, WriterHolder<HttpServletResponse>> monitors2 = new HashMap<>();
public CustomerService() {
init();
}
@GET
@Path("/customers/{id}/")
public Customer getCustomer(@PathParam("id") String id) {
System.out.println("----invoking getCustomer, Customer id is: " + id);
long idNumber = Long.parseLong(id);
Customer customer = customers.get(idNumber);
if (customer != null) {
sendCustomerEvent("retrieved", customer);
}
return customer;
}
@PUT
@Path("/customers/")
public Response updateCustomer(Customer customer) {
System.out.println("----invoking updateCustomer, Customer name is: " + customer.getName());
Customer c = customers.get(customer.getId());
Response r;
if (c != null) {
customers.put(customer.getId(), customer);
r = Response.ok().build();
sendCustomerEvent("updated", customer);
} else {
r = Response.notModified().build();
}
return r;
}
@POST
@Path("/customers/")
public Response addCustomer(Customer customer) {
System.out.println("----invoking addCustomer, Customer name is: " + customer.getName());
customer.setId(++currentId);
customers.put(customer.getId(), customer);
sendCustomerEvent("added", customer);
return Response.ok(customer).build();
}
@DELETE
@Path("/customers/{id}/")
public Response deleteCustomer(@PathParam("id") String id) {
System.out.println("----invoking deleteCustomer, Customer id is: " + id);
long idNumber = Long.parseLong(id);
Customer c = customers.get(idNumber);
Response r;
if (c != null) {
r = Response.ok().build();
Customer customer = customers.remove(idNumber);
if (customer != null) {
sendCustomerEvent("deleted", customer);
}
} else {
r = Response.notModified().build();
}
return r;
}
@Path("/orders/{orderId}/")
public Order getOrder(@PathParam("orderId") String orderId) {
System.out.println("----invoking getOrder, Order id is: " + orderId);
long idNumber = Long.parseLong(orderId);
Order c = orders.get(idNumber);
return c;
}
@GET
@Path("/monitor")
@Produces("text/*")
public StreamingOutput monitorCustomers(
@HeaderParam(WebSocketConstants.DEFAULT_REQUEST_ID_KEY) String reqid) {
final String key = reqid == null ? "*" : reqid;
return new StreamingOutput() {
public void write(final OutputStream out) throws IOException, WebApplicationException {
monitors.put(key, new WriterHolder(out, MAX_ERROR_COUNT));
out.write(("Subscribed at " + new java.util.Date()).getBytes());
}
};
}
@GET
@Path("/monitor2")
@Produces("text/*")
public void monitorCustomers2(
@javax.ws.rs.core.Context final HttpServletResponse httpResponse,
@HeaderParam(WebSocketConstants.DEFAULT_REQUEST_ID_KEY) String reqid) {
final String key = reqid == null ? "*" : reqid;
monitors2.put(key, new WriterHolder(httpResponse, MAX_ERROR_COUNT));
try {
httpResponse.getOutputStream().write(("Subscribed at " + new java.util.Date()).getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
@GET
@Path("/unmonitor/{key}")
@Produces("text/*")
public String unmonitorCustomers(@PathParam("key") String key) {
return (monitors.remove(key) != null ? "Removed: " : "Already removed: ") + key;
}
@GET
@Path("/unmonitor2/{key}")
@Produces("text/*")
public String unmonitorCustomers2(@PathParam("key") String key) {
return (monitors2.remove(key) != null ? "Removed: " : "Already removed: ") + key;
}
// CHECKSTYLE:OFF
private void sendCustomerEvent(final String msg, final Customer customer) {
executor.execute(new Runnable() {
public void run() {
try {
String t = msg + ": " + customer.getId() + "/" + customer.getName();
for (Iterator<WriterHolder<OutputStream>> it = monitors.values().iterator(); it.hasNext();) {
WriterHolder<OutputStream> wh = it.next();
try {
wh.getValue().write(t.getBytes());
wh.getValue().flush();
wh.reset();
} catch (IOException e) {
System.out.println("----error writing to " + wh.getValue() + " " + wh.get());
if (wh.increment()) {
// the max error count reached; purging the output resource
e.printStackTrace();
try {
wh.getValue().close();
} catch (IOException e2) {
// ignore;
}
it.remove();
System.out.println("----purged " + wh.getValue());
}
}
}
for (Iterator<WriterHolder<HttpServletResponse>> it = monitors2.values().iterator();
it.hasNext();) {
WriterHolder<HttpServletResponse> wh = it.next();
try {
wh.getValue().getOutputStream().write(t.getBytes());
wh.getValue().getOutputStream().flush();
wh.reset();
} catch (IOException e) {
System.out.println("----error writing to " + wh.getValue() + " " + wh.get());
if (wh.increment()) {
// the max error count reached; purging the output resource
e.printStackTrace();
try {
wh.getValue().getOutputStream().close();
} catch (IOException e2) {
// ignore;
}
it.remove();
System.out.println("----purged " + wh.getValue());
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
// CHECKSTYLE:ON
final void init() {
Customer c = new Customer();
c.setName("John");
c.setId(123);
customers.put(c.getId(), c);
c = new Customer();
c.setName("Homer");
c.setId(235);
customers.put(c.getId(), c);
Order o = new Order();
o.setDescription("order 223");
o.setId(223);
orders.put(o.getId(), o);
}
private static class WriterHolder<T> {
private final T value;
private final int max;
private final AtomicInteger errorCount;
WriterHolder(T object, int max) {
this.value = object;
this.max = max;
this.errorCount = new AtomicInteger();
}
public T getValue() {
return value;
}
public int get() {
return errorCount.get();
}
public boolean increment() {
return max < errorCount.getAndIncrement();
}
public void reset() {
errorCount.getAndSet(0);
}
}
}