pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/execchain/BackoffStrategyExec.java

@@ -0,0 +1,104 @@
+/*
+ * ====================================================================
+ * 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.execchain;
+
+import java.io.IOException;
+import java.lang.reflect.UndeclaredThrowableException;
+
+import ch.boye.httpclientandroidlib.HttpException;
+import ch.boye.httpclientandroidlib.annotation.Immutable;
+import ch.boye.httpclientandroidlib.client.BackoffManager;
+import ch.boye.httpclientandroidlib.client.ConnectionBackoffStrategy;
+import ch.boye.httpclientandroidlib.client.methods.CloseableHttpResponse;
+import ch.boye.httpclientandroidlib.client.methods.HttpExecutionAware;
+import ch.boye.httpclientandroidlib.client.methods.HttpRequestWrapper;
+import ch.boye.httpclientandroidlib.client.protocol.HttpClientContext;
+import ch.boye.httpclientandroidlib.conn.routing.HttpRoute;
+import ch.boye.httpclientandroidlib.util.Args;
+
+/**
+ * @since 4.3
+ */
+@Immutable
+public class BackoffStrategyExec implements ClientExecChain {
+
+    private final ClientExecChain requestExecutor;
+    private final ConnectionBackoffStrategy connectionBackoffStrategy;
+    private final BackoffManager backoffManager;
+
+    public BackoffStrategyExec(
+            final ClientExecChain requestExecutor,
+            final ConnectionBackoffStrategy connectionBackoffStrategy,
+            final BackoffManager backoffManager) {
+        super();
+        Args.notNull(requestExecutor, "HTTP client request executor");
+        Args.notNull(connectionBackoffStrategy, "Connection backoff strategy");
+        Args.notNull(backoffManager, "Backoff manager");
+        this.requestExecutor = requestExecutor;
+        this.connectionBackoffStrategy = connectionBackoffStrategy;
+        this.backoffManager = backoffManager;
+    }
+
+    public CloseableHttpResponse execute(
+            final HttpRoute route,
+            final HttpRequestWrapper request,
+            final HttpClientContext context,
+            final HttpExecutionAware execAware) throws IOException, HttpException {
+        Args.notNull(route, "HTTP route");
+        Args.notNull(request, "HTTP request");
+        Args.notNull(context, "HTTP context");
+        CloseableHttpResponse out = null;
+        try {
+            out = this.requestExecutor.execute(route, request, context, execAware);
+        } catch (final Exception ex) {
+            if (out != null) {
+                out.close();
+            }
+            if (this.connectionBackoffStrategy.shouldBackoff(ex)) {
+                this.backoffManager.backOff(route);
+            }
+            if (ex instanceof RuntimeException) {
+                throw (RuntimeException) ex;
+            }
+            if (ex instanceof HttpException) {
+                throw (HttpException) ex;
+            }
+            if (ex instanceof IOException) {
+                throw (IOException) ex;
+            }
+            throw new UndeclaredThrowableException(ex);
+        }
+        if (this.connectionBackoffStrategy.shouldBackoff(out)) {
+            this.backoffManager.backOff(route);
+        } else {
+            this.backoffManager.probe(route);
+        }
+        return out;
+    }
+
+}