1 files changed, 178 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/client/cache/AsynchronousValidationRequest.java b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/client/cache/AsynchronousValidationRequest.java
new file mode 100644
index 000000000..60ad6ca1f
--- /dev/null
+++ b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/client/cache/AsynchronousValidationRequest.java
@@ -0,0 +1,178 @@
+/*
+ * ====================================================================
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package ch.boye.httpclientandroidlib.impl.client.cache;
+
+import java.io.IOException;
+
+import ch.boye.httpclientandroidlib.androidextra.HttpClientAndroidLog;
+/* LogFactory removed by HttpClient for Android script. */
+import ch.boye.httpclientandroidlib.Header;
+import ch.boye.httpclientandroidlib.HttpException;
+import ch.boye.httpclientandroidlib.HttpResponse;
+import ch.boye.httpclientandroidlib.client.cache.HeaderConstants;
+import ch.boye.httpclientandroidlib.client.cache.HttpCacheEntry;
+import ch.boye.httpclientandroidlib.client.methods.HttpExecutionAware;
+import ch.boye.httpclientandroidlib.client.methods.HttpRequestWrapper;
+import ch.boye.httpclientandroidlib.client.methods.CloseableHttpResponse;
+import ch.boye.httpclientandroidlib.client.protocol.HttpClientContext;
+import ch.boye.httpclientandroidlib.conn.routing.HttpRoute;
+
+/**
+ * Class used to represent an asynchronous revalidation event, such as with
+ * "stale-while-revalidate"
+ */
+class AsynchronousValidationRequest implements Runnable {
+    private final AsynchronousValidator parent;
+    private final CachingExec cachingExec;
+    private final HttpRoute route;
+    private final HttpRequestWrapper request;
+    private final HttpClientContext context;
+    private final HttpExecutionAware execAware;
+    private final HttpCacheEntry cacheEntry;
+    private final String identifier;
+    private final int consecutiveFailedAttempts;
+
+    public HttpClientAndroidLog log = new HttpClientAndroidLog(getClass());
+
+    /**
+     * Used internally by {@link AsynchronousValidator} to schedule a
+     * revalidation.
+     * @param request
+     * @param context
+     * @param cacheEntry
+     * @param identifier
+     * @param consecutiveFailedAttempts
+     */
+    AsynchronousValidationRequest(
+            final AsynchronousValidator parent,
+            final CachingExec cachingExec,
+            final HttpRoute route,
+            final HttpRequestWrapper request,
+            final HttpClientContext context,
+            final HttpExecutionAware execAware,
+            final HttpCacheEntry cacheEntry,
+            final String identifier,
+            final int consecutiveFailedAttempts) {
+        this.parent = parent;
+        this.cachingExec = cachingExec;
+        this.route = route;
+        this.request = request;
+        this.context = context;
+        this.execAware = execAware;
+        this.cacheEntry = cacheEntry;
+        this.identifier = identifier;
+        this.consecutiveFailedAttempts = consecutiveFailedAttempts;
+    }
+
+    public void run() {
+        try {
+            if (revalidateCacheEntry()) {
+                parent.jobSuccessful(identifier);
+            } else {
+                parent.jobFailed(identifier);
+            }
+        } finally {
+            parent.markComplete(identifier);
+        }
+    }
+
+    /**
+     * Revalidate the cache entry and return if the operation was successful.
+     * Success means a connection to the server was established and replay did
+     * not indicate a server error.
+     * @return <code>true</code> if the cache entry was successfully validated;
+     * otherwise <code>false</code>
+     */
+    protected boolean revalidateCacheEntry() {
+        try {
+            final CloseableHttpResponse httpResponse = cachingExec.revalidateCacheEntry(route, request, context, execAware, cacheEntry);
+            try {
+                final int statusCode = httpResponse.getStatusLine().getStatusCode();
+                return isNotServerError(statusCode) && isNotStale(httpResponse);
+            } finally {
+                httpResponse.close();
+            }
+        } catch (final IOException ioe) {
+            log.debug("Asynchronous revalidation failed due to I/O error", ioe);
+            return false;
+        } catch (final HttpException pe) {
+            log.error("HTTP protocol exception during asynchronous revalidation", pe);
+            return false;
+        } catch (final RuntimeException re) {
+            log.error("RuntimeException thrown during asynchronous revalidation: " + re);
+            return false;
+        }
+    }
+
+    /**
+     * Return whether the status code indicates a server error or not.
+     * @param statusCode the status code to be checked
+     * @return if the status code indicates a server error or not
+     */
+    private boolean isNotServerError(final int statusCode) {
+        return statusCode < 500;
+    }
+
+    /**
+     * Try to detect if the returned response is generated from a stale cache entry.
+     * @param httpResponse the response to be checked
+     * @return whether the response is stale or not
+     */
+    private boolean isNotStale(final HttpResponse httpResponse) {
+        final Header[] warnings = httpResponse.getHeaders(HeaderConstants.WARNING);
+        if (warnings != null)
+        {
+            for (final Header warning : warnings)
+            {
+                /**
+                 * warn-codes
+                 * 110 = Response is stale
+                 * 111 = Revalidation failed
+                 */
+                final String warningValue = warning.getValue();
+                if (warningValue.startsWith("110") || warningValue.startsWith("111"))
+                {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    String getIdentifier() {
+        return identifier;
+    }
+
+    /**
+     * The number of consecutively failed revalidation attempts.
+     * @return the number of consecutively failed revalidation attempts.
+     */
+    public int getConsecutiveFailedAttempts() {
+        return consecutiveFailedAttempts;
+    }
+
+}