/
KeepAliveDataSource.java
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/
KeepAliveDataSource.java
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/**
* Copyright 2012 Asakusa Framework Team.
*
* 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.asakusafw.runtime.directio.keepalive;
import java.io.IOException;
import java.util.List;
import com.asakusafw.runtime.directio.Counter;
import com.asakusafw.runtime.directio.DataFormat;
import com.asakusafw.runtime.directio.DirectDataSource;
import com.asakusafw.runtime.directio.DirectInputFragment;
import com.asakusafw.runtime.directio.OutputAttemptContext;
import com.asakusafw.runtime.directio.OutputTransactionContext;
import com.asakusafw.runtime.directio.ResourcePattern;
import com.asakusafw.runtime.io.ModelInput;
import com.asakusafw.runtime.io.ModelOutput;
/**
* A wrapper of {@link DirectDataSource} that sends heartbeat continuously.
* @since 0.2.6
*/
public class KeepAliveDataSource implements DirectDataSource {
private final DirectDataSource entity;
final HeartbeatKeeper heartbeat;
/**
* Creates a new instance.
* @param entity component {@link DirectDataSource}
* @param interval heartbeat interval
* @throws IllegalArgumentException if some parameters were {@code null}
*/
public KeepAliveDataSource(DirectDataSource entity, long interval) {
if (entity == null) {
throw new IllegalArgumentException("entity must not be null"); //$NON-NLS-1$
}
this.entity = entity;
this.heartbeat = new HeartbeatKeeper(interval);
}
@Override
public <T> List<DirectInputFragment> findInputFragments(
Class<? extends T> dataType,
DataFormat<T> format,
String basePath,
ResourcePattern resourcePattern) throws IOException, InterruptedException {
return entity.findInputFragments(dataType, format, basePath, resourcePattern);
}
@Override
public <T> ModelInput<T> openInput(
Class<? extends T> dataType,
DataFormat<T> format,
DirectInputFragment fragment,
Counter counter) throws IOException, InterruptedException {
ModelInput<T> input = entity.openInput(dataType, format, fragment, counter);
return new WrappedModelInput<T>(input, heartbeat, counter);
}
@Override
public <T> ModelOutput<T> openOutput(
OutputAttemptContext context,
Class<? extends T> dataType,
DataFormat<T> format,
String basePath,
String resourcePath,
Counter counter) throws IOException, InterruptedException {
ModelOutput<T> output = entity.openOutput(context, dataType, format, basePath, resourcePath, counter);
return new WrappedModelOutput<T>(output, heartbeat, counter);
}
@Override
public boolean delete(String basePath, ResourcePattern resourcePattern) throws IOException, InterruptedException {
return entity.delete(basePath, resourcePattern);
}
@Override
public void setupAttemptOutput(OutputAttemptContext context) throws IOException, InterruptedException {
if (context == null) {
throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
}
Counter counter = context.getCounter();
heartbeat.register(counter);
try {
entity.setupAttemptOutput(context);
} finally {
heartbeat.unregister(counter);
}
}
@Override
public void commitAttemptOutput(OutputAttemptContext context) throws IOException, InterruptedException {
if (context == null) {
throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
}
Counter counter = context.getCounter();
heartbeat.register(counter);
try {
entity.commitAttemptOutput(context);
} finally {
heartbeat.unregister(counter);
}
}
@Override
public void cleanupAttemptOutput(OutputAttemptContext context) throws IOException, InterruptedException {
if (context == null) {
throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
}
Counter counter = context.getCounter();
heartbeat.register(counter);
try {
entity.cleanupAttemptOutput(context);
} finally {
heartbeat.unregister(counter);
}
}
@Override
public void setupTransactionOutput(OutputTransactionContext context) throws IOException, InterruptedException {
if (context == null) {
throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
}
Counter counter = context.getCounter();
heartbeat.register(counter);
try {
entity.setupTransactionOutput(context);
} finally {
heartbeat.unregister(counter);
}
}
@Override
public void commitTransactionOutput(OutputTransactionContext context) throws IOException, InterruptedException {
if (context == null) {
throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
}
Counter counter = context.getCounter();
heartbeat.register(counter);
try {
entity.commitTransactionOutput(context);
} finally {
heartbeat.unregister(counter);
}
}
@Override
public void cleanupTransactionOutput(OutputTransactionContext context) throws IOException, InterruptedException {
if (context == null) {
throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
}
Counter counter = context.getCounter();
heartbeat.register(counter);
try {
entity.cleanupTransactionOutput(context);
} finally {
heartbeat.unregister(counter);
}
}
private static final class WrappedModelInput<T> implements ModelInput<T> {
private final ModelInput<T> component;
private final HeartbeatKeeper keeper;
private final Counter counter;
private boolean closed = false;
WrappedModelInput(ModelInput<T> component, HeartbeatKeeper keeper, Counter counter) {
assert component != null;
assert keeper != null;
assert counter != null;
this.component = component;
this.keeper = keeper;
this.counter = counter;
keeper.register(counter);
}
@Override
public boolean readTo(T model) throws IOException {
return component.readTo(model);
}
@Override
public void close() throws IOException {
if (closed) {
return;
}
try {
component.close();
} finally {
keeper.unregister(counter);
closed = true;
}
}
}
private static final class WrappedModelOutput<T> implements ModelOutput<T> {
private final ModelOutput<T> component;
private final HeartbeatKeeper keeper;
private final Counter counter;
private boolean closed = false;
WrappedModelOutput(ModelOutput<T> component, HeartbeatKeeper keeper, Counter counter) {
assert component != null;
assert keeper != null;
assert counter != null;
this.component = component;
this.keeper = keeper;
this.counter = counter;
keeper.register(counter);
}
@Override
public void write(T model) throws IOException {
component.write(model);
}
@Override
public void close() throws IOException {
if (closed) {
return;
}
try {
component.close();
} finally {
keeper.unregister(counter);
closed = true;
}
}
}
}