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Merge pull request #368 from ajkannan/pull-master-updates
Update resource-manager branch
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54 changes: 54 additions & 0 deletions
54
gcloud-java-core/src/main/java/com/google/gcloud/BaseServiceException.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /* | ||
| * Copyright 2015 Google Inc. All Rights Reserved. | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package com.google.gcloud; | ||
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| /** | ||
| * Base class for all service exceptions. | ||
| */ | ||
| public class BaseServiceException extends RuntimeException { | ||
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| private static final long serialVersionUID = 5028833760039966178L; | ||
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| private final int code; | ||
| private final boolean retryable; | ||
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| public BaseServiceException(int code, String message, boolean retryable) { | ||
| super(message); | ||
| this.code = code; | ||
| this.retryable = retryable; | ||
| } | ||
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| public BaseServiceException(int code, String message, boolean retryable, Exception cause) { | ||
| super(message, cause); | ||
| this.code = code; | ||
| this.retryable = retryable; | ||
| } | ||
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| /** | ||
| * Returns the code associated with this exception. | ||
| */ | ||
| public int code() { | ||
| return code; | ||
| } | ||
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| /** | ||
| * Returns {@code true} when it is safe to retry the operation that caused this exception. | ||
| */ | ||
| public boolean retryable() { | ||
| return retryable; | ||
| } | ||
| } |
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67 changes: 67 additions & 0 deletions
67
gcloud-java-core/src/main/java/com/google/gcloud/Page.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| /* | ||
| * Copyright 2015 Google Inc. All Rights Reserved. | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package com.google.gcloud; | ||
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| import java.util.Iterator; | ||
|
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| /** | ||
| * Interface for Google Cloud paginated results. | ||
| * | ||
| * <p> | ||
| * Use {@code Page} to iterate through all values (also in next pages): | ||
| * <pre> {@code | ||
| * Page<T> page = ...; // get a Page<T> instance | ||
| * Iterator<T> iterator = page.iterateAll(); | ||
| * while (iterator.hasNext()) { | ||
| * T value = iterator.next(); | ||
| * // do something with value | ||
| * }}</pre> | ||
| * <p> | ||
| * Or handle pagination explicitly: | ||
| * <pre> {@code | ||
| * Page<T> page = ...; // get a Page<T> instance | ||
| * while (page != null) { | ||
| * for (T value : page.values()) { | ||
| * // do something with value | ||
| * } | ||
| * page = page.nextPage(); | ||
| * }}</pre> | ||
| */ | ||
| public interface Page<T> { | ||
|
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| /** | ||
| * Returns the values contained in this page. | ||
| */ | ||
| Iterable<T> values(); | ||
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| /** | ||
| * Returns an iterator for all values, possibly also in the next pages. Once current page's values | ||
| * are traversed the iterator fetches next page, if any. | ||
| */ | ||
| Iterator<T> iterateAll(); | ||
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| /** | ||
| * Returns the cursor for the nextPage or {@code null} if no more results. | ||
| */ | ||
| String nextPageCursor(); | ||
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| /** | ||
| * Returns the next page of results or {@code null} if no more result. | ||
| */ | ||
| Page<T> nextPage(); | ||
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| } |
111 changes: 111 additions & 0 deletions
111
gcloud-java-core/src/main/java/com/google/gcloud/PageImpl.java
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| @@ -0,0 +1,111 @@ | ||
| /* | ||
| * Copyright 2015 Google Inc. All Rights Reserved. | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package com.google.gcloud; | ||
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| import com.google.common.collect.AbstractIterator; | ||
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| import java.io.Serializable; | ||
| import java.util.Collections; | ||
| import java.util.Iterator; | ||
| import java.util.Objects; | ||
|
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| /** | ||
| * Base implementation for Google Cloud paginated results. | ||
| */ | ||
| public class PageImpl<T> implements Page<T>, Serializable { | ||
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| private static final long serialVersionUID = 3914827379823557934L; | ||
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| private final String cursor; | ||
| private final Iterable<T> results; | ||
| private final NextPageFetcher<T> pageFetcher; | ||
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| public interface NextPageFetcher<T> extends Serializable { | ||
| Page<T> nextPage(); | ||
| } | ||
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| static class PageIterator<T> extends AbstractIterator<T> { | ||
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| private Iterator<T> currentPageIterator; | ||
| private Page<T> currentPage; | ||
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| PageIterator(Page<T> currentPage) { | ||
| this.currentPageIterator = currentPage.values().iterator(); | ||
| this.currentPage = currentPage; | ||
| } | ||
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| @Override | ||
| protected T computeNext() { | ||
| while (!currentPageIterator.hasNext()) { | ||
| currentPage = currentPage.nextPage(); | ||
| if (currentPage == null) { | ||
| return endOfData(); | ||
| } | ||
| currentPageIterator = currentPage.values().iterator(); | ||
| } | ||
| return currentPageIterator.next(); | ||
| } | ||
| } | ||
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| /** | ||
| * Creates a {@code PageImpl} object. In order for the object to be serializable the {@code | ||
| * results} parameter must be serializable. | ||
| */ | ||
| public PageImpl(NextPageFetcher<T> pageFetcher, String cursor, Iterable<T> results) { | ||
| this.pageFetcher = pageFetcher; | ||
| this.cursor = cursor; | ||
| this.results = results; | ||
| } | ||
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| @Override | ||
| public Iterable<T> values() { | ||
| return results == null ? Collections.EMPTY_LIST : results; | ||
| } | ||
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| @Override | ||
| public Iterator<T> iterateAll() { | ||
| return new PageIterator<T>(this); | ||
| } | ||
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| @Override | ||
| public String nextPageCursor() { | ||
| return cursor; | ||
| } | ||
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| @Override | ||
| public Page<T> nextPage() { | ||
| if (cursor == null || pageFetcher == null) { | ||
| return null; | ||
| } | ||
| return pageFetcher.nextPage(); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(cursor, results); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) { | ||
| if (!(obj instanceof PageImpl)) { | ||
| return false; | ||
| } | ||
| PageImpl<?> other = (PageImpl<?>) obj; | ||
| return Objects.equals(cursor, other.cursor) | ||
| && Objects.equals(results, other.results); | ||
| } | ||
| } |
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