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Java example source code file (ServletTest.java)
This example Java source code file (ServletTest.java) is included in the alvinalexander.com
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The ServletTest.java Java example source code
/**
* Copyright (C) 2006 Google Inc.
*
* Licensed 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 com.google.inject.servlet;
import static com.google.inject.Asserts.assertContains;
import static com.google.inject.Asserts.reserialize;
import static com.google.inject.servlet.ServletTestUtils.newFakeHttpServletRequest;
import static com.google.inject.servlet.ServletTestUtils.newFakeHttpServletResponse;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.inject.AbstractModule;
import com.google.inject.BindingAnnotation;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.Provides;
import com.google.inject.ProvisionException;
import com.google.inject.internal.Errors;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.google.inject.servlet.ServletScopes.NullObject;
import com.google.inject.util.Providers;
import junit.framework.TestCase;
import java.io.IOException;
import java.io.Serializable;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import javax.servlet.http.HttpSession;
/**
* @author crazybob@google.com (Bob Lee)
*/
public class ServletTest extends TestCase {
private static final Key<HttpServletRequest> HTTP_REQ_KEY = Key.get(HttpServletRequest.class);
private static final Key<HttpServletResponse> HTTP_RESP_KEY = Key.get(HttpServletResponse.class);
private static final Key<Map REQ_PARAMS_KEY
= new Key<Map(RequestParameters.class) {};
private static final Key<InRequest> IN_REQUEST_NULL_KEY = Key.get(InRequest.class, Null.class);
private static final Key<InSession> IN_SESSION_KEY = Key.get(InSession.class);
private static final Key<InSession> IN_SESSION_NULL_KEY = Key.get(InSession.class, Null.class);
@Override
public void setUp() {
//we need to clear the reference to the pipeline every test =(
GuiceFilter.reset();
}
public void testScopeExceptions() throws Exception {
Injector injector = Guice.createInjector(new AbstractModule() {
@Override protected void configure() {
install(new ServletModule());
}
@Provides @RequestScoped String provideString() { return "foo"; }
@Provides @SessionScoped Integer provideInteger() { return 1; }
@Provides @RequestScoped @Named("foo") String provideNamedString() { return "foo"; }
});
try {
injector.getInstance(String.class);
fail();
} catch(ProvisionException oose) {
assertContains(oose.getMessage(), "Cannot access scoped [java.lang.String].");
}
try {
injector.getInstance(Integer.class);
fail();
} catch(ProvisionException oose) {
assertContains(oose.getMessage(), "Cannot access scoped [java.lang.Integer].");
}
Key<?> key = Key.get(String.class, Names.named("foo"));
try {
injector.getInstance(key);
fail();
} catch(ProvisionException oose) {
assertContains(oose.getMessage(), "Cannot access scoped [" + Errors.convert(key) + "]");
}
}
public void testRequestAndResponseBindings() throws Exception {
final Injector injector = createInjector();
final HttpServletRequest request = newFakeHttpServletRequest();
final HttpServletResponse response = newFakeHttpServletResponse();
final boolean[] invoked = new boolean[1];
GuiceFilter filter = new GuiceFilter();
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
invoked[0] = true;
assertSame(request, servletRequest);
assertSame(request, injector.getInstance(ServletRequest.class));
assertSame(request, injector.getInstance(HTTP_REQ_KEY));
assertSame(response, servletResponse);
assertSame(response, injector.getInstance(ServletResponse.class));
assertSame(response, injector.getInstance(HTTP_RESP_KEY));
assertSame(servletRequest.getParameterMap(), injector.getInstance(REQ_PARAMS_KEY));
}
};
filter.doFilter(request, response, filterChain);
assertTrue(invoked[0]);
}
public void testRequestAndResponseBindings_wrappingFilter() throws Exception {
final HttpServletRequest request = newFakeHttpServletRequest();
final ImmutableMap<String, String[]> wrappedParamMap
= ImmutableMap.of("wrap", new String[]{"a", "b"});
final HttpServletRequestWrapper requestWrapper = new HttpServletRequestWrapper(request) {
@Override public Map getParameterMap() {
return wrappedParamMap;
}
@Override public Object getAttribute(String attr) {
// Ensure that attributes are stored on the original request object.
throw new UnsupportedOperationException();
}
};
final HttpServletResponse response = newFakeHttpServletResponse();
final HttpServletResponseWrapper responseWrapper = new HttpServletResponseWrapper(response);
final boolean[] filterInvoked = new boolean[1];
final Injector injector = createInjector(new ServletModule() {
@Override protected void configureServlets() {
filter("/*").through(new Filter() {
@Inject Provider<ServletRequest> servletReqProvider;
@Inject Provider<HttpServletRequest> reqProvider;
@Inject Provider<ServletResponse> servletRespProvider;
@Inject Provider<HttpServletResponse> respProvider;
public void init(FilterConfig filterConfig) {}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
throws IOException, ServletException {
filterInvoked[0] = true;
assertSame(req, servletReqProvider.get());
assertSame(req, reqProvider.get());
assertSame(resp, servletRespProvider.get());
assertSame(resp, respProvider.get());
chain.doFilter(requestWrapper, responseWrapper);
assertSame(req, reqProvider.get());
assertSame(resp, respProvider.get());
}
public void destroy() {}
});
}
});
GuiceFilter filter = new GuiceFilter();
final boolean[] chainInvoked = new boolean[1];
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
chainInvoked[0] = true;
assertSame(requestWrapper, servletRequest);
assertSame(requestWrapper, injector.getInstance(ServletRequest.class));
assertSame(requestWrapper, injector.getInstance(HTTP_REQ_KEY));
assertSame(responseWrapper, servletResponse);
assertSame(responseWrapper, injector.getInstance(ServletResponse.class));
assertSame(responseWrapper, injector.getInstance(HTTP_RESP_KEY));
assertSame(servletRequest.getParameterMap(), injector.getInstance(REQ_PARAMS_KEY));
InRequest inRequest = injector.getInstance(InRequest.class);
assertSame(inRequest, injector.getInstance(InRequest.class));
}
};
filter.doFilter(request, response, filterChain);
assertTrue(chainInvoked[0]);
assertTrue(filterInvoked[0]);
}
public void testRequestAndResponseBindings_matchesPassedParameters() throws Exception {
final int[] filterInvoked = new int[1];
final boolean[] servletInvoked = new boolean[1];
createInjector(new ServletModule() {
@Override protected void configureServlets() {
final HttpServletRequest[] previousReq = new HttpServletRequest[1];
final HttpServletResponse[] previousResp = new HttpServletResponse[1];
final Provider<ServletRequest> servletReqProvider = getProvider(ServletRequest.class);
final Provider<HttpServletRequest> reqProvider = getProvider(HttpServletRequest.class);
final Provider<ServletResponse> servletRespProvider = getProvider(ServletResponse.class);
final Provider<HttpServletResponse> respProvider = getProvider(HttpServletResponse.class);
Filter filter = new Filter() {
public void init(FilterConfig filterConfig) {}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
throws IOException, ServletException {
filterInvoked[0]++;
assertSame(req, servletReqProvider.get());
assertSame(req, reqProvider.get());
if (previousReq[0] != null) {
assertEquals(req, previousReq[0]);
}
assertSame(resp, servletRespProvider.get());
assertSame(resp, respProvider.get());
if (previousResp[0] != null) {
assertEquals(resp, previousResp[0]);
}
chain.doFilter(
previousReq[0] = new HttpServletRequestWrapper((HttpServletRequest) req),
previousResp[0] = new HttpServletResponseWrapper((HttpServletResponse) resp));
assertSame(req, reqProvider.get());
assertSame(resp, respProvider.get());
}
public void destroy() {}
};
filter("/*").through(filter);
filter("/*").through(filter); // filter twice to test wrapping in filters
serve("/*").with(new HttpServlet() {
@Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
servletInvoked[0] = true;
assertSame(req, servletReqProvider.get());
assertSame(req, reqProvider.get());
assertSame(resp, servletRespProvider.get());
assertSame(resp, respProvider.get());
}
});
}
});
GuiceFilter filter = new GuiceFilter();
filter.doFilter(newFakeHttpServletRequest(), newFakeHttpServletResponse(), new FilterChain() {
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse) {
throw new IllegalStateException("Shouldn't get here");
}
});
assertEquals(2, filterInvoked[0]);
assertTrue(servletInvoked[0]);
}
public void testNewRequestObject()
throws CreationException, IOException, ServletException {
final Injector injector = createInjector();
final HttpServletRequest request = newFakeHttpServletRequest();
GuiceFilter filter = new GuiceFilter();
final boolean[] invoked = new boolean[1];
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
invoked[0] = true;
assertNotNull(injector.getInstance(InRequest.class));
assertNull(injector.getInstance(IN_REQUEST_NULL_KEY));
}
};
filter.doFilter(request, null, filterChain);
assertTrue(invoked[0]);
}
public void testExistingRequestObject()
throws CreationException, IOException, ServletException {
final Injector injector = createInjector();
final HttpServletRequest request = newFakeHttpServletRequest();
GuiceFilter filter = new GuiceFilter();
final boolean[] invoked = new boolean[1];
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
invoked[0] = true;
InRequest inRequest = injector.getInstance(InRequest.class);
assertSame(inRequest, injector.getInstance(InRequest.class));
assertNull(injector.getInstance(IN_REQUEST_NULL_KEY));
assertNull(injector.getInstance(IN_REQUEST_NULL_KEY));
}
};
filter.doFilter(request, null, filterChain);
assertTrue(invoked[0]);
}
public void testNewSessionObject()
throws CreationException, IOException, ServletException {
final Injector injector = createInjector();
final HttpServletRequest request = newFakeHttpServletRequest();
GuiceFilter filter = new GuiceFilter();
final boolean[] invoked = new boolean[1];
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
invoked[0] = true;
assertNotNull(injector.getInstance(InSession.class));
assertNull(injector.getInstance(IN_SESSION_NULL_KEY));
}
};
filter.doFilter(request, null, filterChain);
assertTrue(invoked[0]);
}
public void testExistingSessionObject()
throws CreationException, IOException, ServletException {
final Injector injector = createInjector();
final HttpServletRequest request = newFakeHttpServletRequest();
GuiceFilter filter = new GuiceFilter();
final boolean[] invoked = new boolean[1];
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
invoked[0] = true;
InSession inSession = injector.getInstance(InSession.class);
assertSame(inSession, injector.getInstance(InSession.class));
assertNull(injector.getInstance(IN_SESSION_NULL_KEY));
assertNull(injector.getInstance(IN_SESSION_NULL_KEY));
}
};
filter.doFilter(request, null, filterChain);
assertTrue(invoked[0]);
}
public void testHttpSessionIsSerializable() throws Exception {
final Injector injector = createInjector();
final HttpServletRequest request = newFakeHttpServletRequest();
final HttpSession session = request.getSession();
GuiceFilter filter = new GuiceFilter();
final boolean[] invoked = new boolean[1];
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
invoked[0] = true;
assertNotNull(injector.getInstance(InSession.class));
assertNull(injector.getInstance(IN_SESSION_NULL_KEY));
}
};
filter.doFilter(request, null, filterChain);
assertTrue(invoked[0]);
HttpSession deserializedSession = reserialize(session);
String inSessionKey = IN_SESSION_KEY.toString();
String inSessionNullKey = IN_SESSION_NULL_KEY.toString();
assertTrue(deserializedSession.getAttribute(inSessionKey) instanceof InSession);
assertEquals(NullObject.INSTANCE, deserializedSession.getAttribute(inSessionNullKey));
}
public void testGuiceFilterConstructors() throws Exception {
final RuntimeException servletException = new RuntimeException();
final RuntimeException chainException = new RuntimeException();
final Injector injector = createInjector(new ServletModule() {
@Override protected void configureServlets() {
serve("/*").with(new HttpServlet() {
@Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
throw servletException;
}
});
}
});
final HttpServletRequest request = newFakeHttpServletRequest();
FilterChain filterChain = new FilterChain() {
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse) {
throw chainException;
}
};
try {
new GuiceFilter().doFilter(request, null, filterChain);
fail();
} catch (RuntimeException e) {
assertSame(servletException, e);
}
try {
injector.getInstance(GuiceFilter.class).doFilter(request, null, filterChain);
fail();
} catch (RuntimeException e) {
assertSame(servletException, e);
}
try {
injector.getInstance(Key.get(GuiceFilter.class, ScopingOnly.class))
.doFilter(request, null, filterChain);
fail();
} catch (RuntimeException e) {
assertSame(chainException, e);
}
}
private Injector createInjector(Module... modules) throws CreationException {
return Guice.createInjector(Lists.<Module>asList(new AbstractModule() {
@Override
protected void configure() {
install(new ServletModule());
bind(InSession.class);
bind(IN_SESSION_NULL_KEY).toProvider(Providers.<InSession>of(null)).in(SessionScoped.class);
bind(InRequest.class);
bind(IN_REQUEST_NULL_KEY).toProvider(Providers.<InRequest>of(null)).in(RequestScoped.class);
}
}, modules));
}
@SessionScoped
static class InSession implements Serializable {}
@RequestScoped
static class InRequest {}
@BindingAnnotation @Retention(RUNTIME) @Target({PARAMETER, METHOD, FIELD})
@interface Null {}
}
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