Refactor BasePageFetcher

googleapis · Jan 5, 2016 · b1d2478 · b1d2478
1 parent 823f0de
commit b1d2478
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Showing 4 changed files with 79 additions and 102 deletions.
diff --git a/gcloud-java-bigquery/src/main/java/com/google/gcloud/bigquery/BigQueryImpl.java b/gcloud-java-bigquery/src/main/java/com/google/gcloud/bigquery/BigQueryImpl.java
@@ -38,6 +38,7 @@
 import com.google.gcloud.ExceptionHandler.Interceptor;
 import com.google.gcloud.Page;
 import com.google.gcloud.PageImpl;
+import com.google.gcloud.PageImpl.BasePageFetcher;
 import com.google.gcloud.RetryHelper;
 import com.google.gcloud.bigquery.InsertAllRequest.RowToInsert;
 import com.google.gcloud.spi.BigQueryRpc;
@@ -69,108 +70,93 @@ public RetryResult beforeEval(Exception exception) {
   static final ExceptionHandler EXCEPTION_HANDLER = ExceptionHandler.builder()
       .abortOn(RuntimeException.class).interceptor(EXCEPTION_HANDLER_INTERCEPTOR).build();
 
-  private abstract static class BasePageFetcher<T> implements PageImpl.NextPageFetcher<T> {
+  private static class DatasetPageFetcher extends BasePageFetcher<DatasetInfo, BigQueryOptions> {
 
-    private static final long serialVersionUID = -338124488600215401L;
-
-    protected final Map<BigQueryRpc.Option, ?> requestOptions;
-    protected final BigQueryOptions serviceOptions;
-
-    BasePageFetcher(BigQueryOptions serviceOptions, String cursor,
-        Map<BigQueryRpc.Option, ?> optionMap) {
-      this.serviceOptions = serviceOptions;
-      ImmutableMap.Builder<BigQueryRpc.Option, Object> builder = ImmutableMap.builder();
-      if (cursor != null) {
-        builder.put(BigQueryRpc.Option.PAGE_TOKEN, cursor);
-      }
-      for (Map.Entry<BigQueryRpc.Option, ?> option : optionMap.entrySet()) {
-        if (option.getKey() != BigQueryRpc.Option.PAGE_TOKEN) {
-          builder.put(option.getKey(), option.getValue());
-        }
-      }
-      this.requestOptions = builder.build();
-    }
-  }
-
-  private static class DatasetPageFetcher extends BasePageFetcher<DatasetInfo> {
-
-    private static final long serialVersionUID = 3030824397616608646L;
+    private static final long serialVersionUID = 8049465230453759547L;
 
     DatasetPageFetcher(BigQueryOptions serviceOptions, String cursor,
         Map<BigQueryRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, BigQueryRpc.Option.PAGE_TOKEN, cursor, optionMap);
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Page<DatasetInfo> nextPage() {
-      return listDatasets(serviceOptions, requestOptions);
+      return listDatasets(serviceOptions, (Map<BigQueryRpc.Option, ?>) requestOptions);
     }
   }
 
-  private static class TablePageFetcher extends BasePageFetcher<BaseTableInfo> {
+  private static class TablePageFetcher extends BasePageFetcher<BaseTableInfo, BigQueryOptions> {
 
-    private static final long serialVersionUID = 5908129355985236115L;
+    private static final long serialVersionUID = 6542604186608591265L;
     private final String dataset;
 
     TablePageFetcher(String dataset, BigQueryOptions serviceOptions, String cursor,
         Map<BigQueryRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, BigQueryRpc.Option.PAGE_TOKEN, cursor, optionMap);
       this.dataset = dataset;
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Page<BaseTableInfo> nextPage() {
-      return listTables(dataset, serviceOptions, requestOptions);
+      return listTables(dataset, serviceOptions, (Map<BigQueryRpc.Option, ?>) requestOptions);
     }
   }
 
-  private static class JobPageFetcher extends BasePageFetcher<JobInfo> {
+  private static class JobPageFetcher extends BasePageFetcher<JobInfo, BigQueryOptions> {
 
-    private static final long serialVersionUID = -4984845360519279880L;
+    private static final long serialVersionUID = 1983484324002958994L;
 
     JobPageFetcher(BigQueryOptions serviceOptions, String cursor,
         Map<BigQueryRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, BigQueryRpc.Option.PAGE_TOKEN, cursor, optionMap);
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Page<JobInfo> nextPage() {
-      return listJobs(serviceOptions, requestOptions);
+      return listJobs(serviceOptions, (Map<BigQueryRpc.Option, ?>) requestOptions);
     }
   }
 
-  private static class TableDataPageFetcher extends BasePageFetcher<List<FieldValue>> {
+  private static class TableDataPageFetcher
+      extends BasePageFetcher<List<FieldValue>, BigQueryOptions> {
 
-    private static final long serialVersionUID = 1281938239570262432L;
+    private static final long serialVersionUID = 7767953898927019188L;
     private final TableId table;
 
     TableDataPageFetcher(TableId table, BigQueryOptions serviceOptions, String cursor,
         Map<BigQueryRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, BigQueryRpc.Option.PAGE_TOKEN, cursor, optionMap);
       this.table = table;
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Page<List<FieldValue>> nextPage() {
-      return listTableData(table, serviceOptions, requestOptions);
+      return listTableData(table, serviceOptions, (Map<BigQueryRpc.Option, ?>) requestOptions);
     }
   }
 
-  private static class QueryResultsPageFetcherImpl extends BasePageFetcher<List<FieldValue>>
+  private static class QueryResultsPageFetcherImpl
+      extends BasePageFetcher<List<FieldValue>, BigQueryOptions>
       implements QueryResult.QueryResultsPageFetcher {
 
-    private static final long serialVersionUID = 6713948754731557486L;
+    private static final long serialVersionUID = 6377034420634949203L;
     private final JobId job;
 
     QueryResultsPageFetcherImpl(JobId job, BigQueryOptions serviceOptions, String cursor,
         Map<BigQueryRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, BigQueryRpc.Option.PAGE_TOKEN, cursor, optionMap);
       this.job = job;
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public QueryResult nextPage() {
-      return getQueryResults(job, serviceOptions, requestOptions).result();
+      return getQueryResults(job, serviceOptions, (Map<BigQueryRpc.Option, ?>) requestOptions)
+          .result();
     }
   }
 

diff --git a/gcloud-java-core/src/main/java/com/google/gcloud/PageImpl.java b/gcloud-java-core/src/main/java/com/google/gcloud/PageImpl.java
@@ -17,10 +17,12 @@
 package com.google.gcloud;
 
 import com.google.common.collect.AbstractIterator;
+import com.google.common.collect.ImmutableMap;
 
 import java.io.Serializable;
 import java.util.Collections;
 import java.util.Iterator;
+import java.util.Map;
 import java.util.Objects;
 
 /**
@@ -38,6 +40,37 @@ public interface NextPageFetcher<T> extends Serializable {
     Page<T> nextPage();
   }
 
+  /**
+   * Base class for page fetchers.
+   *
+   * @param <T> the value type that the page holds. {@code T} should implement
+   *     {@code java.io.Serializable}.
+   * @param <O> the service options type
+   */
+  @SuppressWarnings("rawtypes")
+  public abstract static class BasePageFetcher<T, O extends ServiceOptions>
+      implements NextPageFetcher<T> {
+
+    private static final long serialVersionUID = -3333056232729661990L;
+    protected final Map<?, ?> requestOptions;
+    protected final O serviceOptions;
+
+    protected BasePageFetcher(O serviceOptions, Enum<?> pageTokenOption,
+        String cursor, Map<?, ?> optionMap) {
+      this.serviceOptions = serviceOptions;
+      ImmutableMap.Builder<Object, Object> builder = ImmutableMap.builder();
+      if (cursor != null) {
+        builder.put(pageTokenOption, cursor);
+      }
+      for (Map.Entry<?, ?> option : optionMap.entrySet()) {
+        if (option.getKey() != pageTokenOption) {
+          builder.put(option.getKey(), option.getValue());
+        }
+      }
+      this.requestOptions = builder.build();
+    }
+  }
+
   static class PageIterator<T> extends AbstractIterator<T> {
 
     private Iterator<T> currentPageIterator;

diff --git a/...-resourcemanager/src/main/java/com/google/gcloud/resourcemanager/ResourceManagerImpl.java b/...-resourcemanager/src/main/java/com/google/gcloud/resourcemanager/ResourceManagerImpl.java
@@ -29,11 +29,11 @@
 import com.google.gcloud.ExceptionHandler.Interceptor;
 import com.google.gcloud.Page;
 import com.google.gcloud.PageImpl;
+import com.google.gcloud.PageImpl.BasePageFetcher;
 import com.google.gcloud.RetryHelper.RetryHelperException;
 import com.google.gcloud.spi.ResourceManagerRpc;
 import com.google.gcloud.spi.ResourceManagerRpc.Tuple;
 
-import java.io.Serializable;
 import java.util.Map;
 import java.util.concurrent.Callable;
 
@@ -117,42 +117,20 @@ public com.google.api.services.cloudresourcemanager.model.Project call() {
     }
   }
 
-  private abstract static class BasePageFetcher<T extends Serializable>
-      implements PageImpl.NextPageFetcher<T> {
-
-    private static final long serialVersionUID = -5560906434575940205L;
-
-    protected final Map<ResourceManagerRpc.Option, ?> requestOptions;
-    protected final ResourceManagerOptions serviceOptions;
-
-    BasePageFetcher(ResourceManagerOptions serviceOptions, String cursor,
-        Map<ResourceManagerRpc.Option, ?> optionMap) {
-      this.serviceOptions = serviceOptions;
-      ImmutableMap.Builder<ResourceManagerRpc.Option, Object> builder = ImmutableMap.builder();
-      if (cursor != null) {
-        builder.put(ResourceManagerRpc.Option.PAGE_TOKEN, cursor);
-      }
-      for (Map.Entry<ResourceManagerRpc.Option, ?> option : optionMap.entrySet()) {
-        if (option.getKey() != ResourceManagerRpc.Option.PAGE_TOKEN) {
-          builder.put(option.getKey(), option.getValue());
-        }
-      }
-      this.requestOptions = builder.build();
-    }
-  }
-
-  private static class ProjectPageFetcher extends BasePageFetcher<ProjectInfo> {
+  private static class ProjectPageFetcher
+      extends BasePageFetcher<ProjectInfo, ResourceManagerOptions> {
 
     private static final long serialVersionUID = -533306655445189098L;
 
     ProjectPageFetcher(ResourceManagerOptions serviceOptions, String cursor,
         Map<ResourceManagerRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, ResourceManagerRpc.Option.PAGE_TOKEN, cursor, optionMap);
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Page<ProjectInfo> nextPage() {
-      return listProjects(serviceOptions, requestOptions);
+      return listProjects(serviceOptions, (Map<ResourceManagerRpc.Option, ?>) requestOptions);
     }
   }
 

diff --git a/gcloud-java-storage/src/main/java/com/google/gcloud/storage/StorageImpl.java b/gcloud-java-storage/src/main/java/com/google/gcloud/storage/StorageImpl.java
@@ -48,6 +48,7 @@
 import com.google.gcloud.ExceptionHandler.Interceptor;
 import com.google.gcloud.Page;
 import com.google.gcloud.PageImpl;
+import com.google.gcloud.PageImpl.BasePageFetcher;
 import com.google.gcloud.RetryHelper.RetryHelperException;
 import com.google.gcloud.spi.StorageRpc;
 import com.google.gcloud.spi.StorageRpc.RewriteResponse;
@@ -209,58 +210,37 @@ public BlobInfo get(BlobId blob) {
     return get(blob, new BlobGetOption[0]);
   }
 
-  private abstract static class BasePageFetcher<T extends Serializable>
-      implements PageImpl.NextPageFetcher<T> {
+  private static class BucketPageFetcher extends BasePageFetcher<BucketInfo, StorageOptions> {
 
-    private static final long serialVersionUID = 8236329004030295223L;
-    protected final Map<StorageRpc.Option, ?> requestOptions;
-    protected final StorageOptions serviceOptions;
-
-    BasePageFetcher(StorageOptions serviceOptions, String cursor,
-        Map<StorageRpc.Option, ?> optionMap) {
-      this.serviceOptions = serviceOptions;
-      ImmutableMap.Builder<StorageRpc.Option, Object> builder = ImmutableMap.builder();
-      if (cursor != null) {
-        builder.put(StorageRpc.Option.PAGE_TOKEN, cursor);
-      }
-      for (Map.Entry<StorageRpc.Option, ?> option : optionMap.entrySet()) {
-        if (option.getKey() != StorageRpc.Option.PAGE_TOKEN) {
-          builder.put(option.getKey(), option.getValue());
-        }
-      }
-      this.requestOptions = builder.build();
-    }
-  }
-
-  private static class BucketPageFetcher extends BasePageFetcher<BucketInfo> {
-
-    private static final long serialVersionUID = -5490616010200159174L;
+    private static final long serialVersionUID = -2456686089489944533L;
 
     BucketPageFetcher(StorageOptions serviceOptions, String cursor,
         Map<StorageRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, StorageRpc.Option.PAGE_TOKEN, cursor, optionMap);
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Page<BucketInfo> nextPage() {
-      return listBuckets(serviceOptions, requestOptions);
+      return listBuckets(serviceOptions, (Map<StorageRpc.Option, ?>) requestOptions);
     }
   }
 
-  private static class BlobPageFetcher extends BasePageFetcher<BlobInfo> {
+  private static class BlobPageFetcher extends BasePageFetcher<BlobInfo, StorageOptions> {
 
-    private static final long serialVersionUID = -5490616010200159174L;
+    private static final long serialVersionUID = 3841753010333660702L;
     private final String bucket;
 
     BlobPageFetcher(String bucket, StorageOptions serviceOptions, String cursor,
         Map<StorageRpc.Option, ?> optionMap) {
-      super(serviceOptions, cursor, optionMap);
+      super(serviceOptions, StorageRpc.Option.PAGE_TOKEN, cursor, optionMap);
       this.bucket = bucket;
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Page<BlobInfo> nextPage() {
-      return listBlobs(bucket, serviceOptions, requestOptions);
+      return listBlobs(bucket, serviceOptions, (Map<StorageRpc.Option, ?>) requestOptions);
     }
   }